Soil pollution

Story hook

In November 2017, a farmer named Banwari Lal in the village of Bichhri, Udaipur district, Rajasthan, tries to grow chana on his 4-acre field. The plants emerge, then turn yellow within a fortnight, then die. The same field grew bumper wheat 35 years ago — before 1987, when Hindustan Agro Chemicals Limited opened its sulphuric acid + oleum plant 1.5 km upstream and began discharging effluents loaded with gypsum, iron sludge, hydrochloric acid, and sulfates. By 1989, the Supreme Court had taken cognisance; in 1996, in the landmark Indian Council for Enviro-Legal Action v. Union of India case, the SC made history by applying the "Polluter Pays Principle" in India for the first time. The court ordered the polluter to pay Rs. 37.5 crore for remediation. By 2024, that payment is still in arrears, 300 hectares of Bichhri's farmland is unfit for cultivation, and the area's groundwater is fluoride + sulphate contaminated.

Bichhri is one case. 23% of India's land — 96.4 million hectares — is degraded (ICAR-IISS estimates, 2019). 120 million hectares of land is affected by various forms of pollution, salinity, or chemical imbalance (ISRO Wasteland Atlas 2019). The Tata Energy Research Institute (TERI) estimates soil degradation costs India 2.5% of GDP annually — about Rs. 7 lakh crore in 2024 terms.

The contamination spectrum is wide: fertiliser-induced acidification in 18% of Indian soils; pesticide residues in fruits + vegetables (33% of FSSAI samples exceed MRL); industrial heavy metals — chromium in Kanpur tanneries, lead in Singrauli coal belt, cadmium in Vapi chemical estate; fly ash leachate from 18 GW of thermal power plants; e-waste — Seelampur, Moradabad, Bhiwandi processing 80% of India's e-waste informally. And underneath it all: a soil organic carbon crisis — 41% of Indian soils have SOC below 0.5%, the level at which microbial life cannot function efficiently.

For UPSC, soil pollution sits at the intersection of GS-III environment, GS-II governance (CPCB + SPCB + NGT), GS-I geography (soil types + weathering), and GS-IV ethics (intergenerational equity).

Why this matters for UPSC

Soil pollution has been asked in Prelims (2018, 2020, 2022) and in Mains (2019 on soil degradation). It interlinks with agriculture (input pollution), industry (waste), and climate change (carbon sequestration). Prelims tests specific pollutants (cadmium, chromium, fluoride), bodies (CPCB, NCSDC, ICAR-IISS), and remediation techniques (phytoremediation, bioremediation). Mains probes the institutional + remediation framework.