Mitigate arsenic & fluoride contamination in groundwater, NGT tells states
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Context
The has directed states to take urgent remedial measures to address widespread arsenic and fluoride contamination in groundwater across India. Hearing a suo motu case, the tribunal tasked the with monitoring the implementation of mitigation strategies, highlighting a severe public health crisis particularly in the eastern, central, and southern regions. Data submitted reveals extensive contamination affecting thousands of villages, driven by both natural geological processes and anthropogenic factors.
UPSC Perspectives
Environmental
This issue highlights the severe degradation of , a critical component of India's environmental security. The contamination stems from both geogenic (natural geological) and anthropogenic (human-made) sources. As noted by the , natural weathering of rocks, particularly in alluvial formations like the Ganga-Brahmaputra basin, releases arsenic. Anthropogenic drivers include industrial pollution, indiscriminate use of agro-chemicals (fertilizers and pesticides), and over-extraction of groundwater, which often concentrates pollutants in the remaining aquifers. The 's directive emphasizes the need for a multifaceted approach. Remedial measures suggested, such as water filtration plants, ion-exchange processes, and reverse osmosis (RO), are vital for immediate relief. However, long-term environmental sustainability requires regulating groundwater extraction, minimizing agricultural runoff, and strict enforcement against industrial effluent discharge. UPSC aspirants must link this to broader themes of water security and pollution control under GS Paper 3.
Geographical
The geographical distribution of contamination reveals significant regional disparities linked to specific geological and hydrological characteristics. Arsenic contamination is predominantly clustered in eastern and south-eastern regions, severely impacting states like , , , and . This is geologically correlated with the recent Holocene alluvial aquifers of the Ganga-Brahmaputra-Meghna river basins. Conversely, fluoride contamination is more prevalent in the central, eastern, and parts of southern and western states, often associated with crystalline basement rocks containing fluoride-bearing minerals (like fluorite). The data highlighting thousands of affected wards and villages in these specific states underscores the need for region-specific mitigation strategies. For UPSC Geography (GS Paper 1), understanding these spatial patterns and their underlying geomorphological causes is crucial for answering questions on resource distribution and environmental hazards.
Social
The contamination of drinking water sources translates directly into a profound public health crisis, impacting the Right to Life enshrined in of the Constitution, which courts interpret as including the right to clean drinking water. Chronic exposure to arsenic leads to arsenicosis, characterized by severe skin lesions, pigmentation abnormalities, and a high risk of cancer. Fluoride exposure, while essential in trace amounts, causes debilitating skeletal and dental fluorosis at high concentrations. This disproportionately affects rural populations relying heavily on untreated groundwater. The states' responses, such as installing community water purification plants and leveraging the to provide piped water supply, are critical interventions. The 's goal of providing Functional Household Tap Connections (FHTC) is central to mitigating this crisis by shifting reliance away from contaminated local sources. For GS Paper 2, this links directly to governance challenges in ensuring public health and delivering basic services to vulnerable populations.