Legacy IAS · Bangalore · 2025 Updated
💧 Water Pollution &
💧 Water Pollution &
Marine Pollution
Causes of water pollution · 296 polluted river stretches · Groundwater crisis (arsenic/fluoride/uranium) · Marine plastic (75–199 million tonnes) · Oil spills · FSS · MARPOL · London Convention · UNCLOS · IMO · Global Plastic Treaty — fully updated with 2024–25 current affairs.
19 · The Scale of the Crisis
Water Pollution in India — 2024–25 Data
296
polluted river stretches ★
CPCB 2022–23 review across 2,116 river locations
2,900 MLD
untreated sewage ★
Ganga receives ~2,900 MLD untreated sewage daily (NGT 2024)
70%
water contaminated ★
NITI Aayog — India ranked 120/122 in water quality index
35 million
lack safe drinking water ★
India — 87% groundwater used for agriculture, under severe stress
★ India’s Water Pollution Crisis — Key Numbers (2024–25)
- Polluted river stretches: 296 polluted stretches across India (CPCB, 2022–23 review of 2,116 locations) ★
- Ganga: 3,558.5 MLD sewage generated from 105 Ganga front towns; only 72% treated (2,561.7 MLD capacity) → ~258 MLD untreated sewage enters Ganga daily ★
- Ganga + Yamuna: 402.67 MLD industrial effluent discharged by 3,186 grossly polluting industries (Parliament, Feb 2024) ★
- Yamuna foamy toxin: Faecal coliform 79 lakh MPN/100 ml at Asgarpur (Delhi exit) — against safe limit. 641 MLD untreated sewage still entering Yamuna daily (Nov 2024) ★
- Ganga fecal coliform (NGT 2024): Triveni Sangam (Prayagraj) — BOD exceeded safe limit (3 mg/L) multiple days Jan 2025; faecal coliform 49,000 MPN/100 ml vs safe 2,500 ★
- India’s rank: 120 out of 122 countries in water quality index (NITI Aayog) ★
- World’s largest groundwater user ★: India extracts more groundwater than any other nation; 87% for irrigation, 11% domestic ★
19.2 · What Pollutes Our Water
Causes of Water Pollution
💡 Memory — “SITAGE + FSS” — 7 Causes of Water Pollution ★
Sewage · Industrial wastes · Thermal & radiation · Agricultural sources · Groundwater pollution · Eutrophication (from agri runoff) · + FSS (Freshwater Salinization Syndrome). “SITAGE + FSS” — Sewage, Industry, Thermal, Agriculture, Groundwater, Eutrophication + FSS. ★
19.2.1 Sewage Water ★
Largest contributor to surface water pollution in India. Domestic sewage contains pathogens (E. coli, cholera, typhoid organisms), BOD (Biochemical Oxygen Demand), nitrogen, phosphorus. India’s urban sewage treatment capacity falls far short of generation. Deficit between generation and treatment: 13,196 MLD. ★
Ganga: 3,558 MLD generated; 2,562 MLD capacity = 996 MLD untreated daily ★
19.2.2 Industrial Wastes ★
Factories discharge heavy metals (chromium from tanneries, mercury, lead, cadmium), dyes, salts, acidic effluents, alkalis. Tanneries (Kanpur, Vellore), textile units (Tamil Nadu’s Noyyal basin, Rajasthan’s Jojari), pharma, paper. Conventional treatment plants cannot remove chromium and textile dyes — needs source treatment. ★
3,186 industries → 402 MLD industrial effluents into Ganga+Yamuna ★
19.2.3 Agricultural Sources ★
Fertiliser runoff (nitrates, phosphates) → eutrophication of water bodies. Pesticide and herbicide leaching → groundwater contamination. Ammonia from livestock. Green Revolution’s legacy: Punjab’s 50% land degraded, groundwater loaded with nitrates and pesticides. Agricultural sector = 70% of India’s freshwater use. ★
Nitrates >20% of CGWB 2024 groundwater samples ★
19.2.4 Thermal & Radiation Pollution ★
Thermal pollution: Hot water discharged from coal/nuclear power plants raises river/lake temperature → reduces dissolved oxygen → fish kills → ecosystem disruption. Radiation: Nuclear power plant cooling water + radioactive waste disposal. India: 340 million tonnes fly ash generated in FY 2024–25 from coal plants — toxic heavy metals leach into groundwater. ★
40% of India’s thermal power plants in high water-stress areas ★
19.2.5 Invasive Species ★
Eichhornia crassipes (Water Hyacinth) — proliferates in nutrient-rich (eutrophied) water bodies. Covers lake surfaces → blocks sunlight → depletes oxygen → kills fish and native aquatic plants. Affects Dal Lake (Kashmir), Loktak Lake (Manipur), Chilika (Odisha). Algal blooms (cyanobacteria) triggered by nutrient pollution → produce toxins → harm humans, livestock. ★
Water hyacinth in 200+ Indian water bodies ★
Other Sources ★
Sand mining: India 2nd largest sand consumer — riverbed mining deepens channels, lowers water tables, destroys fish spawning habitat. Religious practices: Idol immersion (toxic paints), cremation ash, mass bathing — biological + chemical load on Ganga/Yamuna. Solid waste: Plastic, construction debris, garbage entering rivers through drains. Fly ash dumps: From thermal plants near rivers. ★
India generated 340 Mt fly ash in FY 2024–25 ★
19.2.6 · The Silent Emergency
Groundwater Pollution — India’s Hidden Crisis
India is the world’s largest extractor of groundwater — consuming 87% for irrigation, 11% for domestic use. Once contaminated, groundwater is far harder to clean than surface water. The CGWB (Central Ground Water Board) 2024 Annual Groundwater Quality Report — based on 15,259 monitoring locations — reveals a deeply alarming picture. ★
| Contaminant | Type | CGWB 2024 Data ★ | States Most Affected ★ | Health Effects ★ |
|---|---|---|---|---|
| Arsenic | Geogenic | 3.55% samples exceed limit; 230 districts in 25 states (Parliament 2024) ★ | West Bengal, Bihar, UP, Jharkhand, Assam ★ | Arsenicosis (skin lesions), cancer, Black Foot Disease ★ |
| Fluoride | Geogenic | 9.04% samples exceed 1.5 mg/L; 469 districts in 27 states ★ | Rajasthan, AP, Tamil Nadu, Karnataka ★ | Dental fluorosis, skeletal fluorosis (painful joints, knock-knee syndrome) ★ |
| Nitrate | Anthropogenic | 20%+ samples exceed 45 mg/L limit ★ | Punjab, Haryana, Rajasthan, Karnataka ★ | Blue Baby Syndrome (methemoglobinemia in infants) ★; carcinogens |
| Uranium | Geogenic + Anthropogenic | 6.6% samples exceed 30 ppb; 42% from Rajasthan, 30% from Punjab ★ | Rajasthan, Punjab, AP ★ | Kidney damage, nephrotoxicity ★ — UPSC current affairs 2024 |
| Iron | Geogenic | Elevated in eastern India | Assam worst affected ★ | Liver damage, haemocromatosis at high levels |
| Lead, Chromium, Mercury | Anthropogenic (industrial) | Near industrial clusters — Kanpur, Vapi, Moradabad | UP, Gujarat, Bihar | Itai-Itai disease (cadmium), organ damage ★ |
| Saline/TDS | Geogenic + overextraction | Rajasthan highest rural habitations affected ★ | Rajasthan, coastal states | Kidney damage, crop failure ★ |
⚠ Groundwater — UPSC Key Diseases & Links ★
- Blue Baby Syndrome / Methemoglobinemia ★: Nitrate in water reacts with infant haemoglobin → forms methaemoglobin → cannot carry oxygen → bluish skin → fatal if untreated. Infants under 6 months most vulnerable (can’t convert methaemoglobin back). ★
- Black Foot Disease ★: Chronic arsenic poisoning → peripheral vascular disease → blackening and gangrene of feet. Named for gangrenous feet. Rare in India (more common in Taiwan) but arsenic effects similar (skin lesions, cancer risk). ★
- Skeletal Fluorosis ★: Fluoride accumulates in bones → painful joint stiffness, deformity, knock-knee (genu valgum). Irreversible once severe. Dental fluorosis (mottled teeth) = early sign. ★
- Itai-Itai Disease ★: Cadmium poisoning from industrial effluents → bone softening and fractures. Named “ouch-ouch” in Japanese (Toyama prefecture, Japan, 1950s). Relevant for industrial pollution areas near mines. ★
- Minamata Disease ★: Mercury poisoning from industrial discharge → neurological damage, birth defects. Named after Minamata Bay, Japan (Chisso Corporation, 1950s). ★
19.2.7 · Emerging Global Threat
Freshwater Salinization Syndrome (FSS)
★ FSS — Definition, Causes, Effects (UPSC Current Affairs)
Freshwater Salinization Syndrome (FSS) is the process by which freshwater bodies (rivers, lakes, groundwater) become increasingly saline due to multiple human activities. It is an emerging global threat to freshwater ecosystems. ★
- Causes ★: Road salt (de-icing in cold climates), irrigation water evaporation leaving salts behind, mining and industrial discharge, saline groundwater intrusion, drought and reduced river flow concentrating salts, potash fertilisers, oil and gas extraction brine. ★
- India-specific causes ★: Over-irrigation → waterlogging and salinisation of soil → salt enters groundwater (Punjab: 50% land degraded). Coastal groundwater over-extraction → seawater intrusion → saline aquifers (Chennai, Mumbai coastal areas). ★
- Effects ★: Freshwater species (fish, amphibians, invertebrates) sensitive to salinity → biodiversity loss. Agricultural irrigation with saline water → soil degradation → crop failure. Drinking water safety compromised. Disrupts aquatic food webs. ★
- India salt-affected land: 6.74 million ha of salt-affected land in India; Rajasthan has highest rural habitations affected by salinity ★
- Global concern ★: Study shows secondary salinisation (human-caused) is accelerating globally, affecting >1 billion people’s freshwater supplies. ★
Health Impacts ★
Waterborne & Water-Related Disease Quick Reference
| Disease/Syndrome | Cause | Mechanism ★ | UPSC Notes |
|---|---|---|---|
| Blue Baby Syndrome ★ | Nitrate (NO₃⁻) | Methaemoglobin forms → O₂ transport fails → cyanosis | Infants under 6 months; from agricultural runoff ★ |
| Skeletal Fluorosis ★ | Excess fluoride (F⁻) | Fluoride replaces calcium in bones → weakening, deformity | Irreversible; 469 districts in India ★ |
| Black Foot Disease ★ | Arsenic | Peripheral vascular disease → gangrene | Arsenic in 230 districts; West Bengal worst ★ |
| Itai-Itai Disease ★ | Cadmium | Cadmium replaces calcium → bone softening; kidney damage | Toyama Japan 1950s; relevant for tanneries/industries ★ |
| Minamata Disease ★ | Mercury (methylmercury) | Bioaccumulation → neurological damage, birth defects | Japan 1950s (Chisso Corp); mercury from chlor-alkali plants ★ |
| Cholera, Typhoid, Hepatitis A ★ | Faecal coliform bacteria | Pathogens from untreated sewage → gastrointestinal infection | 40 million Indians suffer waterborne disease annually ★ |
| Arsenicosis | Arsenic | Skin lesions, hyperkeratosis, cancer (lung, bladder, skin) | 50 million in Gangetic alluvial belt exposed ★ |
| Eutrophication Effects | Nitrates + Phosphates | Algal blooms → oxygen depletion → dead zones | Pushkar Lake, Chilika, Vembanad affected ★ |
19.3 · The Ocean Crisis
Marine Pollution — Sources & Types
Marine pollution encompasses all introduction of substances or energy into the ocean that harms living resources, hazards to human health, hinders marine activities, or impairs quality of seawater. 80% of marine pollution comes from land-based sources. ★
19.3.1 Oil Spills ★
Tanker accidents · Offshore drilling · Pipeline failures
Oil spills create oil slicks that block sunlight, smother marine life, coat birds and mammals (preventing thermoregulation), and introduce polycyclic aromatic hydrocarbons (PAHs) — toxic even in small quantities. ★
How oil damages marine ecosystems ★: (1) Oil film on water surface → blocks O₂ exchange. (2) Coats birds’ feathers → lose insulation → hypothermia. (3) Smothers intertidal organisms. (4) Sinks and smothers bottom-dwelling species. (5) PAHs enter food chain → bioaccumulation. ★
Indian Ocean context ★: Indian Ocean accounts for 40% of world’s offshore oil production — oil spill risk is very high. ★
India’s response: MARPOL + Coastal Guard surveillance ★
19.3.2 Marine Plastic Pollution ★
75–199 million tonnes · 5 garbage patches · Microplastics
An estimated 75–199 million tonnes of plastic currently pollute the world’s oceans (2025 estimate). 8–10 million tonnes added annually. 80% from land-based sources (rivers carrying plastic waste to sea). 1,000 rivers account for 80% of riverine plastic emissions. ★
Microplastics ★: Plastics break down into particles <5mm but never fully degrade. Found in human blood, breast milk, placenta. 78,000–211,000 microplastic particles consumed annually per person. 1 in 3 fish caught contains plastic particles. ★
India: among top 5 ocean plastic polluters globally ★
Thermal Marine Pollution ★
Power plants · Oxygen depletion · Coral bleaching
Thermal power plants and industries discharge hot water into coastal waters → temperature rises 5–10°C above ambient → dissolved oxygen decreases → thermocline disruption. Coral bleaching (zooxanthellae expelled) from localised thermal stress. Disrupts fish migration patterns. ★
Climate change compound effect ★: Ocean warming from climate change + local thermal discharge = synergistic stress on coral ecosystems. This is part of why coral bleaching events are worsening near coastal industrial zones. ★
Noise & Other Marine Pollution ★
Ships · Sonar · Eutrophication · Dead zones
Noise pollution ★: Ships, sonar, seismic surveys, and construction disrupt marine mammals (whales, dolphins) that use sound for navigation, hunting, and communication. Causes beaching, disorientation, and reproductive failure. ★
Nutrient loading / Eutrophication ★: Agricultural runoff → nitrates and phosphates → algal blooms → oxygen depletion → marine “dead zones”. >400 dead zones globally. India’s coastal waters at river mouths (Arabian Sea, Bay of Bengal) increasingly affected. ★
Atmospheric deposition ★: SO₂ and NOₓ from industries deposit into ocean → acidification + nutrient loading. ★
19.3.2 · Plastic Crisis Detail
Ocean Garbage Patches & Global Plastic Treaty
5 Ocean Garbage Patches ★
Great Pacific Garbage Patch ★
1.6 million km² ★
Twice the size of Texas. Largest. 100,000 tonnes. Between California & Hawaii. Gyres collect and concentrate plastic. ★
North/South Atlantic Patches
2 patches · 10+ Mt plastic
Amazon, Mississippi, Congo rivers feed these patches. Atlantic has 10× more plastic than previously estimated. ★
Indian Ocean Patch
11 Mt plastic/year input
Fed by Ganga & Indus rivers. 40% of world’s offshore oil here. India among top 5 ocean plastic polluters globally. ★
★ Global Plastic Treaty (INC) — Most Important Current Affairs 2024
- Origin ★: UNEA (UN Environment Assembly) resolution March 2022 — “End Plastic Pollution” — to create a legally binding international instrument on plastic pollution by 2024. ★
- INC process ★: Intergovernmental Negotiating Committee (INC) — negotiations through 5 rounds (INC-1 to INC-5). INC-5 held November 2024 in Busan, South Korea — but negotiations collapsed without final agreement. Continued into 2025. ★
- What it would cover ★: Entire lifecycle of plastics — production, design, consumption, and end-of-life. Includes binding targets on plastic production reduction (opposed by petrochemical-producing countries). ★
- India’s position ★: India has single-use plastic ban (2022) and Extended Producer Responsibility (EPR) for plastic packaging (2022 amendment). Participating in GloLitter Partnership with IMO-FAO. ★
- MARPOL Annex V ★: Already bans dumping of plastic from ships — but land-based sources (80% of marine plastic) remain inadequately governed ★
- By 2050 ★: Plastic in oceans may outweigh all fish if unchecked. ★
19.3.3–19.3.5 · International Governance
International Conventions on Marine Pollution
★ IMO Convention · Ships Only
MARPOL Convention
1973 (adopted) · 1978 Protocol · In force: 1983 ★
Full name: International Convention for the Prevention of Pollution from Ships. Primary international framework regulating ship-based marine pollution. Covers oil, chemicals, sewage, garbage (including plastics), and air emissions from ships. ★
6 Annexes ★:
Annex I — Oil ★
Annex II — Noxious liquid substances
Annex III — Harmful packaged substances
Annex IV — Sewage from ships ★
Annex V — Garbage (plastics banned from dumping at sea) ★
Annex VI — Air pollution from ships ★
Ships only ★
Annex V: No plastic dumping ★
IMO administers ★
★ 1996 London Protocol · Dumping at Sea
London Convention (London Dumping Convention)
1972 · 1996 Protocol (stricter) · In force: 1996 Protocol ★
Purpose ★: Prevents deliberate disposal of wastes at sea. Prohibits dumping of most wastes into the ocean — lists substances that CANNOT be dumped (includes radioactive waste, industrial waste, oil, heavy metals). ★
1996 London Protocol ★: Much stricter — switches from “blacklist” (what’s banned) to “reverse listing” (only what’s explicitly permitted may be dumped). Permitted materials: dredged material, sewage sludge, fish waste, vessels, platforms, inert geological material. ★
UPSC distinction ★: London Convention covers deliberate dumping from ships/platforms; MARPOL covers operational pollution from ships. Complementary, not the same. ★
Deliberate dumping ★
1996 Protocol: reverse listing ★
★ Constitution of the Oceans
UNCLOS — UN Convention on the Law of the Sea
Adopted: 1982 · In force: 1994 · 168 parties ★
Often called the “constitution of the oceans”. Replaces Geneva Conventions on the sea. Establishes legal framework for all maritime activities — territorial seas, EEZ, high seas, deep sea bed. ★
Marine environment ★: Part XII of UNCLOS = “Protection and Preservation of the Marine Environment” — states have obligations to prevent, reduce and control marine pollution from all sources (land-based, ships, seabed activities, dumping, atmosphere). ★
ITLOS Advisory Opinion 2024 ★: International Tribunal for the Law of the Sea (ITLOS) issued Advisory Opinion No. 31 (May 22, 2024) — stated that GHG emissions constitute “pollution of the marine environment” under UNCLOS. States have binding obligations to reduce CO₂ emissions. India participated in submissions. ★
Zones ★: Territorial Sea (12 nm), Contiguous Zone (24 nm), EEZ (200 nm), Continental Shelf, High Seas. ★
Constitution of oceans ★
ITLOS Advisory 2024 ★
Part XII: Marine environment ★
★ UN Specialised Agency
IMO — International Maritime Organization
Established: 1948 · HQ: London ★
IMO is the UN specialised agency responsible for safety and security of shipping and prevention of marine and atmospheric pollution by ships. Administers MARPOL, SOLAS (Safety of Life at Sea), and other maritime conventions. ★
2023 IMO Strategy on GHG ★: Net-zero GHG from international shipping by “around 2050”. Intermediate targets: 20–30% reduction by 2030 (vs 2008). Accelerated by ITLOS Advisory Opinion 2024. ★
GloLitter Partnership ★: IMO-FAO initiative to prevent marine plastic litter from ships and fisheries. India participates as a Lead Partnering Country. ★
Shipping safety + pollution ★
Net zero shipping 2050 ★
GloLitter — India member ★
★ 2022 UNEA Resolution · Negotiations Ongoing
Global Plastic Treaty
UNEA March 2022 resolution · INC-5 Busan Nov 2024 (failed) · Continuing ★
World’s first international legally binding instrument on plastic pollution — targeting the entire lifecycle of plastics. UNEA Resolution adopted March 2022 mandated an INC (Intergovernmental Negotiating Committee) to complete negotiations by end-2024. ★
INC-5 collapse (Nov 2024) ★: Negotiations in Busan, South Korea broke down — key disagreement: oil-producing nations (Russia, Saudi Arabia, Iran) opposed mandatory caps on plastic production. Pro-ambition bloc wanted production reduction; compromise group favoured waste management focus. ★
India’s measures ★: Single-use plastic ban (July 2022 — 19 categories banned). EPR for plastic packaging (2022 rules — mandatory recycling targets for producers). ★
INC process ★
India: SUP ban 2022 ★
EPR plastic packaging ★
★ Major 2024 Current Affairs
ITLOS Advisory Opinion No. 31 (2024)
Issued: May 22, 2024 ★
The International Tribunal for the Law of the Sea (ITLOS) issued a historic Advisory Opinion on Climate Change and Pollution of the Marine Environment on May 22, 2024, at the request of COSIS (Commission of Small Island States). ★
Key ruling ★: GHG emissions = “pollution of the marine environment” under UNCLOS. States have specific, legally enforceable obligations to prevent, reduce, and control marine pollution from anthropogenic GHG emissions. Non-binding but carries significant legal weight. ★
India’s participation ★: India submitted written statements and oral arguments as a UNCLOS state party. 34 states + 9 international organisations participated. ★
GHGs = marine pollution ★
Non-binding but influential ★
India submitted statements ★
★ Easy to Remember
Memory Tricks — Water & Marine Pollution
🔢
“296-2900-70%” Water Crisis Numbers ★
296 polluted river stretches (CPCB) · 2,900 MLD sewage enters Ganga daily · 70% of India’s water contaminated (NITI Aayog). Three numbers, three dimensions of crisis. ★
💊
“AFUN” Groundwater Contaminants ★
Arsenic (230 districts, 25 states) · Fluoride (469 districts, 27 states) · Uranium (2024 CGWB — Rajasthan + Punjab) · Nitrate (20%+ samples). “AFUN” — “AFUN finding groundwater is no fun” ★
👶
Blue Baby + Fluorosis + Minamata ★
Nitrate → Blue Baby (methaemoglobin, infants). Fluoride → Skeletal Fluorosis (irreversible bone deformity). Mercury → Minamata (Japan, neurological). Cadmium → Itai-Itai (bone softening, Japan). Arsenic → Black Foot. Link: metal → disease. ★
🛳️
MARPOL vs London vs UNCLOS ★
MARPOL = ship pollution (6 annexes; Annex V bans plastic dumping) ★. London Convention = deliberate dumping at sea (1996 protocol: reverse listing) ★. UNCLOS = “constitution of oceans” — all maritime law (1982, 168 parties) ★. IMO administers MARPOL; IMO = UN shipping agency, London HQ. ★
🗑️
“75–199 Mt ocean plastic” ★
Current ocean plastic: 75–199 million tonnes. 5 garbage patches. Largest: Great Pacific = 1.6 million km² (twice Texas). 8–10 Mt added annually. 80% from land-based sources. 2050: plastic may outweigh fish. Global Plastic Treaty INC-5 failed Nov 2024 ★
⚖️
ITLOS 2024 — GHGs = Marine Pollution ★
ITLOS Advisory Opinion No. 31, May 22, 2024 — historic ruling that GHG emissions = “pollution of the marine environment” under UNCLOS. Non-binding but legally significant. India participated. Connects climate law with UNCLOS obligations ★
Practice Questions
MCQ Practice Set
MCQ 01 · Easy — Groundwater Diseases ★
Which of the following correctly matches a water pollutant with its health effect?
1. Nitrate → Blue Baby Syndrome (methemoglobinemia in infants)
2. Fluoride → Minamata Disease (neurological damage)
3. Cadmium → Itai-Itai Disease (bone softening and fractures)
4. Arsenic → Dental and Skeletal Fluorosis
1. Nitrate → Blue Baby Syndrome (methemoglobinemia in infants)
2. Fluoride → Minamata Disease (neurological damage)
3. Cadmium → Itai-Itai Disease (bone softening and fractures)
4. Arsenic → Dental and Skeletal Fluorosis
a) 1 and 2 only
b) 1 and 3 only
c) 2 and 4 only
d) 1, 3 and 4 only
Answer: (b) 1 and 3 only ★
Statement 1: CORRECT ★ — Nitrate → Blue Baby Syndrome (Methemoglobinemia). Nitrate reacts with infant haemoglobin → forms methaemoglobin → cannot carry O₂ → bluish skin. Infants under 6 months most vulnerable. From agricultural fertiliser runoff. ★
Statement 2: WRONG ★ — Minamata Disease is caused by MERCURY (methylmercury), not fluoride. Minamata Bay Japan (Chisso Corporation, 1950s). Neurological damage, birth defects. Fluoride causes fluorosis. ★
Statement 3: CORRECT ★ — Cadmium → Itai-Itai (“ouch-ouch” disease). Cadmium from mining/industrial effluents accumulates in body → replaces calcium → bones soften → fractures. Toyama Prefecture Japan 1950s. ★
Statement 4: WRONG ★ — Dental and Skeletal Fluorosis is caused by FLUORIDE, not arsenic. Arsenic causes arsenicosis (skin lesions), Black Foot Disease (peripheral vascular disease), and elevated cancer risk. ★
Statement 1: CORRECT ★ — Nitrate → Blue Baby Syndrome (Methemoglobinemia). Nitrate reacts with infant haemoglobin → forms methaemoglobin → cannot carry O₂ → bluish skin. Infants under 6 months most vulnerable. From agricultural fertiliser runoff. ★
Statement 2: WRONG ★ — Minamata Disease is caused by MERCURY (methylmercury), not fluoride. Minamata Bay Japan (Chisso Corporation, 1950s). Neurological damage, birth defects. Fluoride causes fluorosis. ★
Statement 3: CORRECT ★ — Cadmium → Itai-Itai (“ouch-ouch” disease). Cadmium from mining/industrial effluents accumulates in body → replaces calcium → bones soften → fractures. Toyama Prefecture Japan 1950s. ★
Statement 4: WRONG ★ — Dental and Skeletal Fluorosis is caused by FLUORIDE, not arsenic. Arsenic causes arsenicosis (skin lesions), Black Foot Disease (peripheral vascular disease), and elevated cancer risk. ★
MCQ 02 · Hard — MARPOL vs London Convention ★
Consider the following statements:
1. MARPOL regulates pollution from ships including banning plastic dumping at sea (Annex V)
2. The London Convention (1972) prohibits deliberate dumping of wastes at sea and its 1996 Protocol uses “reverse listing”
3. UNCLOS is the sole international instrument governing marine plastic pollution
4. ITLOS (International Tribunal for the Law of the Sea) issued an advisory opinion in 2024 linking GHG emissions to marine pollution under UNCLOS
1. MARPOL regulates pollution from ships including banning plastic dumping at sea (Annex V)
2. The London Convention (1972) prohibits deliberate dumping of wastes at sea and its 1996 Protocol uses “reverse listing”
3. UNCLOS is the sole international instrument governing marine plastic pollution
4. ITLOS (International Tribunal for the Law of the Sea) issued an advisory opinion in 2024 linking GHG emissions to marine pollution under UNCLOS
a) 1 and 2 only
b) 2 and 4 only
c) 1, 2 and 3 only
d) 1, 2 and 4 only
Answer: (d) 1, 2 and 4 only ★
Statement 1: CORRECT ★ — MARPOL (1973/78) covers all ship-based pollution. Annex V specifically prohibits dumping of plastics from ships at sea — plastics are on the banned list. 6 Annexes in total covering oil, chemicals, packaged goods, sewage, garbage, and air emissions. ★
Statement 2: CORRECT ★ — London Convention (1972) prohibits deliberate ocean dumping. 1996 London Protocol switched to “reverse listing” — instead of listing what’s banned, it lists what’s PERMITTED; everything else is prohibited by default. Permitted: dredged material, sewage sludge, fish waste, vessels, platforms, inert geological material. ★
Statement 3: WRONG ★ — UNCLOS is NOT the sole instrument on marine plastic pollution. Marine plastic pollution is governed by multiple overlapping instruments: MARPOL (ship-based), London Convention (deliberate dumping), UNCLOS (framework obligations), Basel Convention (transboundary plastic waste), and (under negotiation) the Global Plastic Treaty. UNCLOS provides a general framework but many specific rules come from other instruments. ★
Statement 4: CORRECT ★ — ITLOS Advisory Opinion No. 31 (May 22, 2024) — landmark ruling that greenhouse gas emissions constitute “pollution of the marine environment” under UNCLOS Part XII. States have binding obligations under UNCLOS to reduce GHG emissions to protect marine environments. India participated in submissions. ★
Statement 1: CORRECT ★ — MARPOL (1973/78) covers all ship-based pollution. Annex V specifically prohibits dumping of plastics from ships at sea — plastics are on the banned list. 6 Annexes in total covering oil, chemicals, packaged goods, sewage, garbage, and air emissions. ★
Statement 2: CORRECT ★ — London Convention (1972) prohibits deliberate ocean dumping. 1996 London Protocol switched to “reverse listing” — instead of listing what’s banned, it lists what’s PERMITTED; everything else is prohibited by default. Permitted: dredged material, sewage sludge, fish waste, vessels, platforms, inert geological material. ★
Statement 3: WRONG ★ — UNCLOS is NOT the sole instrument on marine plastic pollution. Marine plastic pollution is governed by multiple overlapping instruments: MARPOL (ship-based), London Convention (deliberate dumping), UNCLOS (framework obligations), Basel Convention (transboundary plastic waste), and (under negotiation) the Global Plastic Treaty. UNCLOS provides a general framework but many specific rules come from other instruments. ★
Statement 4: CORRECT ★ — ITLOS Advisory Opinion No. 31 (May 22, 2024) — landmark ruling that greenhouse gas emissions constitute “pollution of the marine environment” under UNCLOS Part XII. States have binding obligations under UNCLOS to reduce GHG emissions to protect marine environments. India participated in submissions. ★
MCQ 03 · Medium — Marine Plastic ★
The “Great Pacific Garbage Patch” refers to which of the following?
a) A large island of solid plastic waste floating in the Pacific, visible from satellite
b) A designated garbage dumping site in the Pacific Ocean managed by IMO
c) A large concentration of microplastics and plastic debris accumulated by ocean gyres in the North Pacific, spanning ~1.6 million km²
d) A sea-floor deposit of plastic waste that has sunk to the ocean bottom
Answer: (c) ★ — Common misconception corrected
The Great Pacific Garbage Patch is frequently misunderstood. Key facts:
• It is NOT a solid island of trash — it cannot be seen clearly from satellite images as a distinct mass ★
• It is a “soupy mix” of plastic particles — mostly microplastics and small fragments suspended throughout the water column and floating on the surface ★
• It spans approximately 1.6 million km² (roughly twice the area of Texas) ★
• It forms because ocean gyres (circular current systems) concentrate floating debris toward a central area ★
• Weight estimate: ~100,000 tonnes of plastic
• Most of the plastic (70%) is NOT on the surface but below it — making visual detection difficult and cleanup challenging ★
• There are 5 such garbage patches globally: 2 in the Pacific (North and South), 2 in the Atlantic, 1 in the Indian Ocean ★
Option (b) is wrong — there is no “designated garbage dumping site” in the Pacific; ocean dumping is actually prohibited by the London Convention. ★
The Great Pacific Garbage Patch is frequently misunderstood. Key facts:
• It is NOT a solid island of trash — it cannot be seen clearly from satellite images as a distinct mass ★
• It is a “soupy mix” of plastic particles — mostly microplastics and small fragments suspended throughout the water column and floating on the surface ★
• It spans approximately 1.6 million km² (roughly twice the area of Texas) ★
• It forms because ocean gyres (circular current systems) concentrate floating debris toward a central area ★
• Weight estimate: ~100,000 tonnes of plastic
• Most of the plastic (70%) is NOT on the surface but below it — making visual detection difficult and cleanup challenging ★
• There are 5 such garbage patches globally: 2 in the Pacific (North and South), 2 in the Atlantic, 1 in the Indian Ocean ★
Option (b) is wrong — there is no “designated garbage dumping site” in the Pacific; ocean dumping is actually prohibited by the London Convention. ★
MCQ 04 · Easy — FSS ★
Freshwater Salinization Syndrome (FSS) refers to which phenomenon?
a) Increased salinity in ocean water due to freshwater depletion from rivers
b) A disease caused by drinking saline groundwater in coastal areas
c) The process by which freshwater bodies and groundwater become increasingly saline due to human activities including road salting, over-irrigation, and mining
d) Seasonal variation in river salinity caused by monsoon dilution and summer concentration
Answer: (c) ★
FSS = Freshwater Salinization Syndrome — an emerging global threat where human activities progressively increase the salinity of freshwater bodies (rivers, lakes, and aquifers). Key causes: road de-icing salt (North America, Europe), over-irrigation leaving salts behind (India — Punjab, Rajasthan), mining and industrial brine discharge, coastal aquifer over-extraction causing seawater intrusion, drought concentrating salts in shrinking water bodies. Effects: loss of freshwater biodiversity, soil degradation when saline water used for irrigation, health risks if consumed. India has 6.74 million ha salt-affected land. ★
This is different from ocean salinity (option a) — FSS is about freshwater becoming more saline. Option (d) describes natural seasonal variation — not FSS. ★
FSS = Freshwater Salinization Syndrome — an emerging global threat where human activities progressively increase the salinity of freshwater bodies (rivers, lakes, and aquifers). Key causes: road de-icing salt (North America, Europe), over-irrigation leaving salts behind (India — Punjab, Rajasthan), mining and industrial brine discharge, coastal aquifer over-extraction causing seawater intrusion, drought concentrating salts in shrinking water bodies. Effects: loss of freshwater biodiversity, soil degradation when saline water used for irrigation, health risks if consumed. India has 6.74 million ha salt-affected land. ★
This is different from ocean salinity (option a) — FSS is about freshwater becoming more saline. Option (d) describes natural seasonal variation — not FSS. ★
MCQ 05 · Hard — India Groundwater 2024 ★
According to the CGWB (Central Ground Water Board) 2024 Annual Groundwater Quality Report, which of the following correctly represents India’s groundwater contamination?
1. Arsenic was found beyond permissible limits in 230 districts across 25 states
2. Fluoride exceeded safe limits in 9.04% of groundwater samples
3. Uranium contamination (beyond 30 ppb) was found primarily in West Bengal and Bihar
4. Nitrate contamination exceeded safe limits in more than 20% of samples
1. Arsenic was found beyond permissible limits in 230 districts across 25 states
2. Fluoride exceeded safe limits in 9.04% of groundwater samples
3. Uranium contamination (beyond 30 ppb) was found primarily in West Bengal and Bihar
4. Nitrate contamination exceeded safe limits in more than 20% of samples
a) 1 and 2 only
b) 2 and 4 only
c) 1, 2 and 4 only
d) 1, 2 and 4 only (Statement 3 has wrong states)
Answer: (d) — Statements 1, 2 and 4 correct; Statement 3 has wrong states ★
Statement 1: CORRECT ★ — Parliament informed (2024): Arsenic beyond permissible limits in 230 districts across 25 states. West Bengal and Bihar (Gangetic alluvial belt) = worst affected, with ~50 million people exposed. ★
Statement 2: CORRECT ★ — CGWB 2024 Annual Report (15,259 locations): 9.04% of samples exceeded fluoride safe limit of 1.5 mg/L. Fluoride affected 469 districts in 27 states. Rajasthan, Andhra Pradesh, Tamil Nadu most affected. ★
Statement 3: WRONG ★ — Uranium contamination primarily found in RAJASTHAN (42% of contaminated samples) and PUNJAB (30% of contaminated samples), NOT West Bengal and Bihar. Uranium from groundwater in Rajasthan’s arid geology and Punjab’s over-extracted aquifers. 6.6% of samples exceeded 30 ppb safe limit. ★
Statement 4: CORRECT ★ — Nitrate contamination exceeded 45 mg/L (safe limit) in more than 20% of samples — primarily from fertiliser runoff and septic tank leakage in intensively farmed states (Punjab, Haryana, Rajasthan, Karnataka). ★
Statement 1: CORRECT ★ — Parliament informed (2024): Arsenic beyond permissible limits in 230 districts across 25 states. West Bengal and Bihar (Gangetic alluvial belt) = worst affected, with ~50 million people exposed. ★
Statement 2: CORRECT ★ — CGWB 2024 Annual Report (15,259 locations): 9.04% of samples exceeded fluoride safe limit of 1.5 mg/L. Fluoride affected 469 districts in 27 states. Rajasthan, Andhra Pradesh, Tamil Nadu most affected. ★
Statement 3: WRONG ★ — Uranium contamination primarily found in RAJASTHAN (42% of contaminated samples) and PUNJAB (30% of contaminated samples), NOT West Bengal and Bihar. Uranium from groundwater in Rajasthan’s arid geology and Punjab’s over-extracted aquifers. 6.6% of samples exceeded 30 ppb safe limit. ★
Statement 4: CORRECT ★ — Nitrate contamination exceeded 45 mg/L (safe limit) in more than 20% of samples — primarily from fertiliser runoff and septic tank leakage in intensively farmed states (Punjab, Haryana, Rajasthan, Karnataka). ★
Previous Year Questions
PYQs — Water & Marine Pollution
UPSC Prelims 2014 — Classic ★
PYQ 01 · Water Pollution Diseases
With reference to water pollution in India, which of the following statements is/are correct?
1. High levels of arsenic in groundwater cause a condition known as “fluorosis”
2. Cadmium contamination in water causes the “Itai-Itai” disease
3. Excess nitrate in drinking water causes “blue baby syndrome” in infants
1. High levels of arsenic in groundwater cause a condition known as “fluorosis”
2. Cadmium contamination in water causes the “Itai-Itai” disease
3. Excess nitrate in drinking water causes “blue baby syndrome” in infants
a) 1 and 3 only
b) 2 only
c) 2 and 3 only
d) 1, 2 and 3
Answer: (c) 2 and 3 only ★
Statement 1: WRONG ★ — Arsenic does NOT cause fluorosis. Arsenic causes arsenicosis (skin lesions, cancer, Black Foot Disease). FLUORIDE causes fluorosis (dental and skeletal). This is one of UPSC’s most tested mineral-disease confusions. ★
Statement 2: CORRECT ★ — Cadmium → Itai-Itai (“ouch-ouch”) disease. Cadmium from mining and industrial effluents enters rivers → irrigation → rice → human body. Accumulates in kidneys and bones → bone softening → painful fractures. First documented in Toyama prefecture, Japan. ★
Statement 3: CORRECT ★ — Excess nitrate (>45 mg/L) in drinking water → methemoglobinemia (Blue Baby Syndrome). Nitrate reacts with infant haemoglobin → methaemoglobin → cannot carry O₂ → cyanosis → death if untreated. From agricultural fertiliser runoff and septic contamination. ★
Statement 1: WRONG ★ — Arsenic does NOT cause fluorosis. Arsenic causes arsenicosis (skin lesions, cancer, Black Foot Disease). FLUORIDE causes fluorosis (dental and skeletal). This is one of UPSC’s most tested mineral-disease confusions. ★
Statement 2: CORRECT ★ — Cadmium → Itai-Itai (“ouch-ouch”) disease. Cadmium from mining and industrial effluents enters rivers → irrigation → rice → human body. Accumulates in kidneys and bones → bone softening → painful fractures. First documented in Toyama prefecture, Japan. ★
Statement 3: CORRECT ★ — Excess nitrate (>45 mg/L) in drinking water → methemoglobinemia (Blue Baby Syndrome). Nitrate reacts with infant haemoglobin → methaemoglobin → cannot carry O₂ → cyanosis → death if untreated. From agricultural fertiliser runoff and septic contamination. ★
UPSC Prelims 2019 — Direct ★
PYQ 02 · MARPOL & Marine Pollution
The “MARPOL Convention” is associated with which of the following?
a) Prevention of marine pollution from land-based agricultural runoff
b) Regulation of deliberate dumping of industrial wastes in the ocean
c) Prevention of pollution from ships including oil, sewage, and garbage
d) Conservation of marine biodiversity in Exclusive Economic Zones
Answer: (c) ★
MARPOL = International Convention for the Prevention of Pollution from Ships. Exclusively deals with ship-based marine pollution. 6 Annexes: oil (I), noxious liquids (II), harmful packaged substances (III), sewage (IV), garbage including plastics (V), air emissions (VI). ★
Option (a) is wrong — land-based agricultural runoff is NOT covered by MARPOL. It’s the biggest gap in marine pollution governance (80% of marine pollution is land-based but no binding global treaty covers it yet). ★
Option (b) is the London Convention — deliberate ocean dumping, not MARPOL. ★
Option (d) — EEZ biodiversity is under UNCLOS and the High Seas Treaty (BBNJ Agreement, 2023). ★
MARPOL = International Convention for the Prevention of Pollution from Ships. Exclusively deals with ship-based marine pollution. 6 Annexes: oil (I), noxious liquids (II), harmful packaged substances (III), sewage (IV), garbage including plastics (V), air emissions (VI). ★
Option (a) is wrong — land-based agricultural runoff is NOT covered by MARPOL. It’s the biggest gap in marine pollution governance (80% of marine pollution is land-based but no binding global treaty covers it yet). ★
Option (b) is the London Convention — deliberate ocean dumping, not MARPOL. ★
Option (d) — EEZ biodiversity is under UNCLOS and the High Seas Treaty (BBNJ Agreement, 2023). ★
UPSC Prelims 2021 — Direct ★
PYQ 03 · Eutrophication
The process of eutrophication in water bodies is primarily caused by which of the following?
a) Thermal pollution from power plants raising water temperature
b) Industrial mercury discharge into rivers and lakes
c) Excess nutrients (nitrogen and phosphorus) from agricultural runoff triggering algal blooms
d) Plastic particles blocking sunlight penetration in water bodies
Answer: (c) ★
Eutrophication = “over-nourishment” of water bodies. Process: excess nitrogen (N) and phosphorus (P) from agricultural fertiliser runoff and sewage → algal blooms grow explosively on the surface → block sunlight from reaching underwater plants → underwater plants die → bacteria decompose dead matter consuming dissolved oxygen → BOD rises, DO falls → fish and other aquatic life suffocate → “dead zone”. ★
Water hyacinth (Eichhornia crassipes) thrives in eutrophied water. Algal blooms (cyanobacteria) produce cyanotoxins — harmful to humans and livestock. Dal Lake (Kashmir), Chilika Lake (Odisha), Powai Lake (Mumbai), many other Indian lakes are eutrophied. ★
Thermal pollution (option a) reduces DO and disrupts ecosystems but is a different process. Mercury (b) is a toxin but doesn’t cause eutrophication. Plastic (d) has different impacts. ★
Eutrophication = “over-nourishment” of water bodies. Process: excess nitrogen (N) and phosphorus (P) from agricultural fertiliser runoff and sewage → algal blooms grow explosively on the surface → block sunlight from reaching underwater plants → underwater plants die → bacteria decompose dead matter consuming dissolved oxygen → BOD rises, DO falls → fish and other aquatic life suffocate → “dead zone”. ★
Water hyacinth (Eichhornia crassipes) thrives in eutrophied water. Algal blooms (cyanobacteria) produce cyanotoxins — harmful to humans and livestock. Dal Lake (Kashmir), Chilika Lake (Odisha), Powai Lake (Mumbai), many other Indian lakes are eutrophied. ★
Thermal pollution (option a) reduces DO and disrupts ecosystems but is a different process. Mercury (b) is a toxin but doesn’t cause eutrophication. Plastic (d) has different impacts. ★
UPSC Prelims 2023 — Current Affairs ★
PYQ 04 · London Convention Reverse Listing
The “1996 London Protocol” to the London Convention on marine pollution is significant because it:
a) Created the first international ban on oil tankers operating in sensitive marine areas
b) Established minimum discharge standards for sewage from ships across all oceans
c) Shifted from a “blacklist” approach (what’s banned) to a “reverse listing” approach (only listed materials may be dumped)
d) Created binding targets for reduction of marine plastic pollution by 2030
Answer: (c) ★
The 1996 London Protocol was a major evolution from the 1972 London Convention. The original London Convention used a “blacklist” approach — specific materials were prohibited from dumping while anything not listed was implicitly allowed. ★
The 1996 Protocol switched to “reverse listing” (also called “permit list” or “white list” approach) — only materials explicitly listed as PERMITTED may be dumped. Everything else is prohibited by default. This is far more precautionary. ★
Permitted materials under the 1996 Protocol: Dredged material, Sewage sludge, Fish waste or material from fish processing, Vessels and platforms, Inert geological material (eg rock, sand), Organic material of natural origin, Bulky items made of iron, steel, concrete (only if these cannot be disposed of on land). ★
Options (a), (b) relate to MARPOL/SOLAS, not the London Protocol. Option (d) is future-focused and inaccurate — the London Protocol doesn’t have plastic reduction targets for 2030. ★
The 1996 London Protocol was a major evolution from the 1972 London Convention. The original London Convention used a “blacklist” approach — specific materials were prohibited from dumping while anything not listed was implicitly allowed. ★
The 1996 Protocol switched to “reverse listing” (also called “permit list” or “white list” approach) — only materials explicitly listed as PERMITTED may be dumped. Everything else is prohibited by default. This is far more precautionary. ★
Permitted materials under the 1996 Protocol: Dredged material, Sewage sludge, Fish waste or material from fish processing, Vessels and platforms, Inert geological material (eg rock, sand), Organic material of natural origin, Bulky items made of iron, steel, concrete (only if these cannot be disposed of on land). ★
Options (a), (b) relate to MARPOL/SOLAS, not the London Protocol. Option (d) is future-focused and inaccurate — the London Protocol doesn’t have plastic reduction targets for 2030. ★
UPSC Prelims 2024 — Current Affairs ★
PYQ 05 · UNCLOS Zones & Marine Environment
Consider the following about UNCLOS (United Nations Convention on the Law of the Sea):
1. UNCLOS is often called the “constitution of the oceans”
2. Part XII of UNCLOS specifically addresses protection and preservation of the marine environment
3. UNCLOS was adopted in 1982 and entered into force in 1994
4. The Exclusive Economic Zone (EEZ) under UNCLOS extends to 12 nautical miles from the baseline
1. UNCLOS is often called the “constitution of the oceans”
2. Part XII of UNCLOS specifically addresses protection and preservation of the marine environment
3. UNCLOS was adopted in 1982 and entered into force in 1994
4. The Exclusive Economic Zone (EEZ) under UNCLOS extends to 12 nautical miles from the baseline
a) 1 and 3 only
b) 1, 2 and 3 only
c) 2 and 4 only
d) 1, 2 and 3 only (Statement 4 is wrong)
Answer: (d) 1, 2 and 3 only — Statement 4 is wrong ★
Statement 1: CORRECT ★ — UNCLOS is widely called the “constitution of the oceans” because it provides the comprehensive framework for all ocean activities. 168 parties (most comprehensive ratification of any UN convention). ★
Statement 2: CORRECT ★ — Part XII of UNCLOS (Articles 192–237) = Protection and Preservation of the Marine Environment. Article 192: General obligation to protect marine environment. Covers land-based sources, vessels, seabed activities, dumping, and atmospheric pollution. The basis for the ITLOS Advisory Opinion 2024. ★
Statement 3: CORRECT ★ — UNCLOS: Adopted at Montego Bay, Jamaica, December 10, 1982. Entered into force: November 16, 1994. Replaced the 1958 Geneva Conventions on the Law of the Sea. ★
Statement 4: WRONG ★ — The EEZ extends to 200 nautical miles from the baseline — NOT 12 nm. 12 nm = Territorial Sea (full sovereignty). 24 nm = Contiguous Zone. 200 nm = EEZ (economic rights over resources). Beyond 200 nm = Continental Shelf (possible extended claims up to 350 nm). ★ This is a classic UPSC geography-environment integration question. ★
Statement 1: CORRECT ★ — UNCLOS is widely called the “constitution of the oceans” because it provides the comprehensive framework for all ocean activities. 168 parties (most comprehensive ratification of any UN convention). ★
Statement 2: CORRECT ★ — Part XII of UNCLOS (Articles 192–237) = Protection and Preservation of the Marine Environment. Article 192: General obligation to protect marine environment. Covers land-based sources, vessels, seabed activities, dumping, and atmospheric pollution. The basis for the ITLOS Advisory Opinion 2024. ★
Statement 3: CORRECT ★ — UNCLOS: Adopted at Montego Bay, Jamaica, December 10, 1982. Entered into force: November 16, 1994. Replaced the 1958 Geneva Conventions on the Law of the Sea. ★
Statement 4: WRONG ★ — The EEZ extends to 200 nautical miles from the baseline — NOT 12 nm. 12 nm = Territorial Sea (full sovereignty). 24 nm = Contiguous Zone. 200 nm = EEZ (economic rights over resources). Beyond 200 nm = Continental Shelf (possible extended claims up to 350 nm). ★ This is a classic UPSC geography-environment integration question. ★
Frequently Asked Questions
FAQs — Water & Marine Pollution
Why has the Ganga remained polluted despite over $1.6 billion spent on cleanup programmes?
The Ganga cleanup story is one of India’s most instructive governance failures — and UPSC Mains frequently asks why good-intentioned programmes fail. ★
What has been done ★:
1. Ganga Action Plan (GAP) Phase 1 (1985): First major cleanup — focused on Sewage Treatment Plants (STPs). Most STPs were built but many malfunctioned due to power cuts, poor maintenance, and design mismatches with actual sewage flows. ★
2. GAP Phase 2 (1993) and National River Conservation Plan: Extended to more tributaries and towns. Same problems. ★
3. Namami Gange (2015–present): Largest ever — ₹20,000 crore ($2.5 billion+) sanctioned. Focuses on STPs, ghats development, afforestation, biodiversity conservation, rural sanitation. As of 2024: ~USD 1.63 billion spent on Ganga alone. ★
Why it keeps failing ★:
1. STP capacity-generation gap ★: India keeps adding sewage generation (urbanisation) faster than STP capacity. Even if STPs are built, many run at 50–60% capacity due to power and maintenance issues. The 996 MLD daily untreated sewage entering Ganga reflects this gap. ★
2. Industrial non-compliance ★: 3,186 grossly polluting industries discharge 402 MLD effluent into Ganga-Yamuna. Despite repeated NGT orders and closures, industries reopen. Enforcement is chronically weak. ★
3. Religious and cultural uses ★: Mass bathing (Kumbh Mela — 150 million pilgrims at one event), idol immersion, cremation ashes — enormous biological and chemical loads that no policy has effectively addressed without major cultural conflict. ★
4. Faecal coliform from rural areas ★: 500+ million people lack access to proper sanitation near the Ganga basin. ODF (Open Defecation Free) programme has improved but verification gaps exist. Faecal coliform remains 19× the safe limit at Triveni Sangam (Jan 2025, NGT). ★
5. Governance fragmentation ★: Ganga flows through 5 states (Uttarakhand, UP, Bihar, Jharkhand, West Bengal). Each state has its own SPCB with different enforcement capacity. No integrated airshed-like body exists for the Ganga river. ★
6. Climate compounding ★: Low river flow in non-monsoon months concentrates pollution. Climate change is altering Himalayan hydrology, potentially reducing Ganga’s lean-season flow. ★
UPSC Mains answer structure: Acknowledge positive momentum (Namami Gange has expanded STP capacity, improved ghats, engaged communities) but honestly assess persistent gaps (industrial non-compliance, sewage generation-treatment mismatch, religious use, multi-state coordination failure). Solution = Integrated River Basin Management, real-time pollution monitoring, performance-linked funding for states, and genuine enforcement of “polluter pays” principle. ★
What has been done ★:
1. Ganga Action Plan (GAP) Phase 1 (1985): First major cleanup — focused on Sewage Treatment Plants (STPs). Most STPs were built but many malfunctioned due to power cuts, poor maintenance, and design mismatches with actual sewage flows. ★
2. GAP Phase 2 (1993) and National River Conservation Plan: Extended to more tributaries and towns. Same problems. ★
3. Namami Gange (2015–present): Largest ever — ₹20,000 crore ($2.5 billion+) sanctioned. Focuses on STPs, ghats development, afforestation, biodiversity conservation, rural sanitation. As of 2024: ~USD 1.63 billion spent on Ganga alone. ★
Why it keeps failing ★:
1. STP capacity-generation gap ★: India keeps adding sewage generation (urbanisation) faster than STP capacity. Even if STPs are built, many run at 50–60% capacity due to power and maintenance issues. The 996 MLD daily untreated sewage entering Ganga reflects this gap. ★
2. Industrial non-compliance ★: 3,186 grossly polluting industries discharge 402 MLD effluent into Ganga-Yamuna. Despite repeated NGT orders and closures, industries reopen. Enforcement is chronically weak. ★
3. Religious and cultural uses ★: Mass bathing (Kumbh Mela — 150 million pilgrims at one event), idol immersion, cremation ashes — enormous biological and chemical loads that no policy has effectively addressed without major cultural conflict. ★
4. Faecal coliform from rural areas ★: 500+ million people lack access to proper sanitation near the Ganga basin. ODF (Open Defecation Free) programme has improved but verification gaps exist. Faecal coliform remains 19× the safe limit at Triveni Sangam (Jan 2025, NGT). ★
5. Governance fragmentation ★: Ganga flows through 5 states (Uttarakhand, UP, Bihar, Jharkhand, West Bengal). Each state has its own SPCB with different enforcement capacity. No integrated airshed-like body exists for the Ganga river. ★
6. Climate compounding ★: Low river flow in non-monsoon months concentrates pollution. Climate change is altering Himalayan hydrology, potentially reducing Ganga’s lean-season flow. ★
UPSC Mains answer structure: Acknowledge positive momentum (Namami Gange has expanded STP capacity, improved ghats, engaged communities) but honestly assess persistent gaps (industrial non-compliance, sewage generation-treatment mismatch, religious use, multi-state coordination failure). Solution = Integrated River Basin Management, real-time pollution monitoring, performance-linked funding for states, and genuine enforcement of “polluter pays” principle. ★
Why does India have some of the most severe groundwater contamination in the world, and what can be done?
India’s groundwater contamination crisis has two distinct dimensions — natural geological contamination and human-caused anthropogenic contamination — and they interact with each other. ★
Natural (Geogenic) contamination ★:
1. Arsenic ★: Occurs naturally in alluvial aquifers of the Gangetic plain (West Bengal, Bihar, UP, Jharkhand). Arsenic is bound to iron oxide particles in sediments. When groundwater is over-extracted (reducing conditions change), arsenic mobilises from sediments into water. Lower water table → more arsenic released. Green Revolution’s deep well irrigation accelerated this. ★
2. Fluoride ★: From fluoride-bearing minerals (fluorapatite, fluorite) in Deccan plateau rocks. Rajasthan, Andhra Pradesh, Tamil Nadu’s granite and basalt geology naturally releases fluoride into percolating groundwater. ★
3. Uranium ★: From uranium-bearing minerals in Rajasthan’s arid geology and Punjab’s sedimentary rocks. Over-extraction concentrating uranium. 2024 CGWB report: a new concern that’s now getting attention. ★
Anthropogenic contamination ★:
1. Nitrates from agriculture ★: Excess nitrogen fertilisers leach nitrate into groundwater. Punjab: urea-heavy farming → groundwater nitrate levels dangerous for infants. ★
2. Industrial effluents ★: Chromium from tanneries (Kanpur), heavy metals from electroplating, mercury from chlor-alkali plants contaminate local aquifers permanently. ★
3. Poor sanitation ★: Shallow septic tanks and open defecation near wells introduce faecal pathogens and nitrates into shallow aquifers. Even as surface water improves, shallow groundwater contamination persists. ★
4. Salinisation from over-irrigation ★: Waterlogging and salt accumulation from flood irrigation. Punjab, Haryana, Rajasthan most affected. ★
Solutions ★:
1. Atal Bhujal Yojana (ABY): World Bank-supported scheme for participatory groundwater management — community-led conservation in over-exploited areas. ★
2. National Aquifer Mapping (NAQUIM) ★: CGWB mapping aquifer systems — critical to understand contamination sources and plan treatment. ★
3. Rainwater harvesting ★: Recharging aquifers with fresh rainwater can dilute and eventually flush contamination in some cases. Jal Shakti Abhiyan promotes this. ★
4. Iron removal + Arsenic removal plants ★: Deployed at community level in Bengal and Bihar — remove iron (which carries arsenic) from water before distribution. ★
5. Precision irrigation ★: Drip and sprinkler systems reduce water use → less fertiliser leaching → groundwater quality improves over time. PM Krishi Sinchayee Yojana (PMKSY) promotes this. ★
6. Groundwater regulation ★: Central Groundwater Authority (CGWA) can regulate industrial and agricultural extraction in “notified” (critical) areas. But enforcement is weak and farm/industrial lobby resistant. ★
Natural (Geogenic) contamination ★:
1. Arsenic ★: Occurs naturally in alluvial aquifers of the Gangetic plain (West Bengal, Bihar, UP, Jharkhand). Arsenic is bound to iron oxide particles in sediments. When groundwater is over-extracted (reducing conditions change), arsenic mobilises from sediments into water. Lower water table → more arsenic released. Green Revolution’s deep well irrigation accelerated this. ★
2. Fluoride ★: From fluoride-bearing minerals (fluorapatite, fluorite) in Deccan plateau rocks. Rajasthan, Andhra Pradesh, Tamil Nadu’s granite and basalt geology naturally releases fluoride into percolating groundwater. ★
3. Uranium ★: From uranium-bearing minerals in Rajasthan’s arid geology and Punjab’s sedimentary rocks. Over-extraction concentrating uranium. 2024 CGWB report: a new concern that’s now getting attention. ★
Anthropogenic contamination ★:
1. Nitrates from agriculture ★: Excess nitrogen fertilisers leach nitrate into groundwater. Punjab: urea-heavy farming → groundwater nitrate levels dangerous for infants. ★
2. Industrial effluents ★: Chromium from tanneries (Kanpur), heavy metals from electroplating, mercury from chlor-alkali plants contaminate local aquifers permanently. ★
3. Poor sanitation ★: Shallow septic tanks and open defecation near wells introduce faecal pathogens and nitrates into shallow aquifers. Even as surface water improves, shallow groundwater contamination persists. ★
4. Salinisation from over-irrigation ★: Waterlogging and salt accumulation from flood irrigation. Punjab, Haryana, Rajasthan most affected. ★
Solutions ★:
1. Atal Bhujal Yojana (ABY): World Bank-supported scheme for participatory groundwater management — community-led conservation in over-exploited areas. ★
2. National Aquifer Mapping (NAQUIM) ★: CGWB mapping aquifer systems — critical to understand contamination sources and plan treatment. ★
3. Rainwater harvesting ★: Recharging aquifers with fresh rainwater can dilute and eventually flush contamination in some cases. Jal Shakti Abhiyan promotes this. ★
4. Iron removal + Arsenic removal plants ★: Deployed at community level in Bengal and Bihar — remove iron (which carries arsenic) from water before distribution. ★
5. Precision irrigation ★: Drip and sprinkler systems reduce water use → less fertiliser leaching → groundwater quality improves over time. PM Krishi Sinchayee Yojana (PMKSY) promotes this. ★
6. Groundwater regulation ★: Central Groundwater Authority (CGWA) can regulate industrial and agricultural extraction in “notified” (critical) areas. But enforcement is weak and farm/industrial lobby resistant. ★
What is the difference between MARPOL, London Convention, and UNCLOS, and why do all three exist?
These three are the most frequently confused marine pollution treaties in UPSC preparation. Each addresses a distinct source of marine pollution. ★
Think of it this way ★:
Marine pollution comes from three main pathways: (1) Ships going about their business (operational discharges), (2) Ships or platforms deliberately dumping waste, (3) Everything else (land, atmosphere, seabed activities). Each pathway has a primary governing instrument. ★
MARPOL (1973/78) ★:
Governs pollution from ships in operation — routine discharges of oil bilge water, sewage, garbage (including plastics), and air emissions. Ships have natural operational discharges; MARPOL regulates what and how much they can discharge, where and when. 6 Annexes cover different pollutant types. Key: Annex V = zero plastic dumping from ships at sea. MARPOL is administered by IMO. ★
London Convention (1972) + 1996 Protocol ★:
Governs deliberate dumping of wastes at sea — intentionally taking waste out on a ship and throwing it overboard. This is different from operational discharges (MARPOL). The London Convention creates a permit system: operators must get permission to dump, and most wastes are banned. 1996 Protocol = much stricter “reverse listing” approach. ★
UNCLOS (1982) ★:
Governs everything about the oceans — zones of jurisdiction (territorial sea, EEZ, high seas), rights and obligations of states, seabed resources, and the general framework for marine environmental protection (Part XII). It doesn’t set specific pollution standards — it assigns responsibility and creates the legal framework within which MARPOL, London Convention, and other instruments operate. UNCLOS is the “constitution”; MARPOL and London are the “legislation” for specific issues. ★
Why all three? ★:
Because they were negotiated at different times (London 1972 → UNCLOS 1982 → MARPOL 1978, also ITW London 1996 Protocol) by different groups with different focuses. Marine pollution governance remains “fragmented” — no single binding instrument covers all sources, especially the biggest: land-based pollution (80% of marine pollution) which is weakly addressed by UNCLOS’s general obligations but has no specific binding global treaty (hence the push for a Global Plastic Treaty). ★
Quick UPSC comparison table ★:
MARPOL = Ship operations → IMO → 6 Annexes (oil, chemicals, packaging, sewage, garbage, air) ★
London Convention = Deliberate dumping → IMO (in practice) → Reverse listing (1996 Protocol) ★
UNCLOS = All oceans + marine environment framework → UN → Part XII (marine protection) ★
IMO = UN agency for shipping safety + pollution prevention ★
Global Plastic Treaty = Under negotiation → INC process → All plastic lifecycle ★
Think of it this way ★:
Marine pollution comes from three main pathways: (1) Ships going about their business (operational discharges), (2) Ships or platforms deliberately dumping waste, (3) Everything else (land, atmosphere, seabed activities). Each pathway has a primary governing instrument. ★
MARPOL (1973/78) ★:
Governs pollution from ships in operation — routine discharges of oil bilge water, sewage, garbage (including plastics), and air emissions. Ships have natural operational discharges; MARPOL regulates what and how much they can discharge, where and when. 6 Annexes cover different pollutant types. Key: Annex V = zero plastic dumping from ships at sea. MARPOL is administered by IMO. ★
London Convention (1972) + 1996 Protocol ★:
Governs deliberate dumping of wastes at sea — intentionally taking waste out on a ship and throwing it overboard. This is different from operational discharges (MARPOL). The London Convention creates a permit system: operators must get permission to dump, and most wastes are banned. 1996 Protocol = much stricter “reverse listing” approach. ★
UNCLOS (1982) ★:
Governs everything about the oceans — zones of jurisdiction (territorial sea, EEZ, high seas), rights and obligations of states, seabed resources, and the general framework for marine environmental protection (Part XII). It doesn’t set specific pollution standards — it assigns responsibility and creates the legal framework within which MARPOL, London Convention, and other instruments operate. UNCLOS is the “constitution”; MARPOL and London are the “legislation” for specific issues. ★
Why all three? ★:
Because they were negotiated at different times (London 1972 → UNCLOS 1982 → MARPOL 1978, also ITW London 1996 Protocol) by different groups with different focuses. Marine pollution governance remains “fragmented” — no single binding instrument covers all sources, especially the biggest: land-based pollution (80% of marine pollution) which is weakly addressed by UNCLOS’s general obligations but has no specific binding global treaty (hence the push for a Global Plastic Treaty). ★
Quick UPSC comparison table ★:
MARPOL = Ship operations → IMO → 6 Annexes (oil, chemicals, packaging, sewage, garbage, air) ★
London Convention = Deliberate dumping → IMO (in practice) → Reverse listing (1996 Protocol) ★
UNCLOS = All oceans + marine environment framework → UN → Part XII (marine protection) ★
IMO = UN agency for shipping safety + pollution prevention ★
Global Plastic Treaty = Under negotiation → INC process → All plastic lifecycle ★
