Discuss the public-health implications of heavy-metal contamination of groundwater and suggest an institutional framework for cleaning up contaminated sites.

Heavy metals such as chromium, arsenic, lead and cadmium persist in aquifers long after the polluting unit shuts. The NGT recently took suo motu cognisance of hexavalent chromium in UP's groundwater and issued notices to 14 authorities, including AIIMS New Delhi [1]. That shows contamination is now a public-health problem, not only a pollution problem.

Public-health implications

• Cancer risk: Cr(VI) in drinking water caused tumours in animal studies, while Cr(III) has low toxicity. The WHO limit (0.05 mg/L) is only provisional [2].
• Many organs harmed: arsenic causes skin lesions, lead affects children's brain development and cadmium damages the kidneys. The CPCB has found cadmium and copper in groundwater above BIS limits at listed sites [3].
• Hard to detect: routine tests measure total chromium, not the toxic Cr(VI) separately [2], so exposure is underestimated.
• Hard to prove harm: human evidence is weaker than animal evidence [2]. Victims struggle to prove the cause, which is why the precautionary principle matters.
• Equity: the poor, who depend on hand-pumps, bear most of the exposure. This undercuts the Article 21 right to safe water.

Suggested institutional framework

Identify → Prioritise → Remediate → Verify → Monitor health
 (CPCB)      (SPCB)    (polluter/fund)  (CPCB)   (Health Dept/AIIMS)

Fig: Remediation chain

• Identification: expand CPCB's state-wise inventory of contaminated sites [3] through systematic surveys, not news reports.
• Governance: put the Remediation of Contaminated Sites Rules, 2025 into practice. The CPCB-chaired Central Remediation Committee, state committees and SPCB-led prioritisation are the backbone [4].
• Finance: the Rules make the polluter bear the full cost [4]. For orphan sites where the polluter is shut or cannot pay, create a fund modelled on the US Superfund, which is financed by levies on chemical and oil firms [5].
• Realistic deadlines: groundwater clean-up can take decades, as at Fort Lewis, USA [6]. Supply piped or treated water under the Jal Jeevan Mission in the meantime.
• Health: require biomonitoring and medical follow-up by the state health department with AIIMS [1].
• Accountability: the CPCB should certify completion [4], and the NGT should set time-bound milestones [1].

Heavy-metal contamination is a slow, invisible health crisis. Moving from reactive litigation to a funded remediation regime with clear rules can secure safe water for affected communities. This will advance SDG 6 and the constitutional promise of a healthy environment.