Q.Describe the nature of water pollution in India.

Nature of Water Pollution in India

Water pollution in India is predominantly anthropogenic, arising from untreated discharge into surface and groundwater bodies.

Industrial effluents contribute heavy metals (mercury, lead, chromium), toxic chemicals, and thermal pollution—textile, tannery, and chemical industries discharge directly into rivers without adequate treatment. Domestic sewage forms the largest volume; over 70% of urban wastewater enters water bodies untreated, carrying pathogens, organic matter (high BOD), and nutrients that trigger eutrophication. Agricultural runoff introduces pesticides, fertilizers (nitrates, phosphates), and soil sediments, contaminating both surface and groundwater—nitrate levels in Punjab and Haryana aquifers often exceed safe limits.

Religious and cultural practices add organic load (flowers, offerings) and partially cremated remains to rivers. Plastic waste and solid refuse clog water bodies, leaching toxins. Groundwater faces additional threats from arsenic (Bengal basin), fluoride (Rajasthan, Andhra Pradesh), and salinity intrusion in coastal zones.

The Ganga, Yamuna, and other major rivers are critically polluted; fecal coliform counts routinely exceed permissible limits by orders of magnitude, rendering water unfit for drinking or bathing.

Water pollution in India is not a single problem but a layered catastrophe shaped by population density, rapid industrialization, and institutional failure. Understanding its nature means recognizing that nearly every water body—rivers, lakes, groundwater—faces contamination from multiple, often overlapping sources.

The Sources and Character of Pollution

1. Domestic sewage dominates the pollution load.

Urban India generates roughly 72,000 million liters of sewage daily, yet treatment capacity handles barely 30% of it. The rest flows directly into rivers and lakes. This untreated sewage carries organic matter, pathogens (bacteria, viruses, protozoa), nutrients (nitrogen, phosphorus), and suspended solids. The Ganga, Yamuna, and Sabarmati are essentially open sewers in stretches passing through cities. Biological Oxygen Demand (BOD)—a measure of organic pollution—routinely exceeds safe limits by factors of five to ten in urban river segments.

2. Industrial effluents add toxic chemicals.

Tanneries, textile mills, chemical plants, and pharmaceutical factories discharge heavy metals (chromium, lead, mercury, cadmium), synthetic dyes, solvents, and persistent organic pollutants. The Ganges at Kanpur receives chromium from leather tanneries; the Noyyal River in Tamil Nadu carries untreated textile dye. Many small and medium industries bypass effluent treatment entirely. Even treated industrial water often fails to meet discharge standards because monitoring is weak and penalties negligible.

3. Agricultural runoff introduces nutrients and pesticides.

The Green Revolution's legacy includes fertilizer and pesticide residues leaching into groundwater and surface water. Nitrate contamination of groundwater is widespread in Punjab, Haryana, and parts of Uttar Pradesh, causing methemoglobinemia (blue baby syndrome) in infants. Pesticide residues—DDT, endosulfan, organophosphates—persist in water bodies and bioaccumulate in fish, entering the food chain.

4. Religious and cultural practices contribute organic load.

Immersion of idols (containing plaster of Paris, toxic paints), disposal of flowers and ritual offerings, and open-air cremation ashes all enter rivers considered sacred. During festivals, the pollution spike is measurable: dissolved oxygen drops, turbidity soars, and fecal coliform counts explode.

5. Groundwater faces a silent crisis.

Over-extraction has caused seawater intrusion in coastal aquifers (Chennai, Mumbai) and drawn naturally occurring arsenic and fluoride into wells in West Bengal, Bihar, Rajasthan, and Andhra Pradesh. Arsenic poisoning affects millions in the Ganga-Brahmaputra basin; fluorosis (skeletal and dental damage) is endemic in fluoride-belt districts.

The Consequences

The pollution is both chemical (heavy metals, pesticides, nitrates) and biological (pathogens). Waterborne diseases—cholera, typhoid, hepatitis A, dysentery—account for a significant fraction of India's disease burden, particularly among children. Eutrophication chokes lakes and reservoirs with algal blooms, killing fish and rendering water unfit even for irrigation. Coastal pollution from urban and industrial waste has degraded marine ecosystems and fisheries.

The Institutional Gap

India has laws—the Water (Prevention and Control of Pollution) Act, 1974; the Environment Protection Act, 1986—and a network of Pollution Control Boards. Yet enforcement is patchy. Sewage treatment plants are underfunded and poorly maintained; industrial compliance is sporadic; and political will falters when economic interests clash with environmental mandates. The Ganga Action Plan, launched in 1986, has seen billions spent with limited success because the root causes—population growth, urbanization without infrastructure, industrial impunity—remain unaddressed.