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Environment & Ecology April 23, 2026 5 min read Daily brief · #9 of 38

Mitigate arsenic & fluoride contamination in groundwater, NGT tells states

The National Green Tribunal (NGT) issued a directive on April 17, 2026, ordering all state governments to implement measures to mitigate arsenic and fluoride...

GS Paper II (Governance Social Justice); GS Paper III (Environment & Ecology)

What Happened

  • The National Green Tribunal (NGT) issued a directive on April 17, 2026, ordering all state governments to implement measures to mitigate arsenic and fluoride contamination in groundwater, and directing the Central Ground Water Authority (CGWA) to monitor and track remedial action across the country.
  • The bench, comprising the Chairperson and two expert members, took note of the scale of contamination: Bihar reported arsenic contamination in 4,709 wards and fluoride in 3,789 wards; West Bengal reports arsenic in 8 districts and fluoride in 7; Uttar Pradesh has both contaminants affecting 16 districts each; Karnataka has arsenic in 20 villages and fluoride in over 2,083 villages.
  • Arsenic contamination is geographically concentrated in eastern and southeastern India, while fluoride contamination is more prevalent in central, eastern, southern, and western India — reflecting distinct geological origins of each contaminant.
  • Recommended remedial measures include installation of water filtration plants, ion exchange processes, and reverse osmosis (RO) systems; the CGWA has been tasked with ensuring these are implemented and regularly audited.
  • The NGT noted that despite existing legal frameworks and prior directions, groundwater contamination due to arsenic and fluoride was not being effectively addressed, signalling inadequate inter-agency coordination at the state level.

Static Topic Bridges

National Green Tribunal (NGT) — Powers, Composition, and Jurisdiction

The National Green Tribunal was established under the National Green Tribunal Act, 2010, for effective and expeditious disposal of civil cases relating to environmental protection, conservation of forests, and other natural resources. It is a specialised quasi-judicial body with pan-India jurisdiction, and is not bound by the Code of Civil Procedure; it applies principles of natural justice and is guided by the principles of sustainable development, the precautionary principle, and the polluter pays principle.

  • The NGT consists of a Chairperson (who must be a retired Supreme Court judge), judicial members, and expert members with experience in scientific and technical matters.
  • It has original jurisdiction over "substantial questions relating to the environment" and appellate jurisdiction over orders of regulatory bodies under seven environmental statutes, including the Water (Prevention and Control of Pollution) Act, 1974.
  • The NGT has suo motu powers — it can initiate cases on its own without a formal complaint, and its orders are binding and enforceable.
  • The Tribunal is mandated to dispose of applications within six months of filing.
  • Principal Bench is in New Delhi; Zonal Benches are in Bhopal, Pune, Kolkata, and Chennai.

Connection to this news: The April 2026 directive is an exercise of the NGT's oversight and enforcement jurisdiction over environmental remediation, directing executive action on groundwater quality — an area covered under the Water (Prevention and Control of Pollution) Act, 1974 and the Environment (Protection) Act, 1986.

Arsenic and Fluoride Contamination — Sources, Health Impacts, and Geology

Arsenic and fluoride are naturally occurring geogenic contaminants that leach into groundwater from geological formations, though arsenic contamination is also exacerbated by over-extraction of groundwater and industrial pollution.

  • Arsenic: Primarily found in the Indo-Gangetic plains and Bengal Basin in India, where arsenic-rich sedimentary deposits (derived from Himalayan rock weathering) dissolve into aquifers. WHO safe limit for arsenic in drinking water: 10 micrograms per litre (µg/L); India's BIS standard: 10 µg/L (50 µg/L as permissible limit in absence of alternatives).
  • Fluoride: Derived from fluoride-bearing rocks (fluorite, apatite, mica) found across the Deccan Plateau and parts of Rajasthan, Gujarat, and Andhra Pradesh. BIS permissible limit: 1 mg/L (desirable) and 1.5 mg/L (maximum). Excess fluoride causes dental and skeletal fluorosis.
  • Chronic arsenic exposure causes arsenicosis, characterised by skin lesions, hyperkeratosis, and elevated risk of lung, bladder, and skin cancers; it also affects the cardiovascular and nervous systems.
  • Approximately 21 million people in India are estimated to be exposed to arsenic levels above safe limits; fluoride affects an even larger population, particularly in rural areas dependent on bore wells.

Connection to this news: The geographic pattern noted by the NGT — arsenic in eastern India, fluoride in central and southern India — directly reflects the geological origins of these contaminants, underscoring why technical solutions (filtration, RO) must be site-specific and why the NGT directed the CGWA to customise monitoring frameworks.

Central Ground Water Authority (CGWA) and Groundwater Governance in India

The Central Ground Water Authority is a statutory body established under the Environment (Protection) Act, 1986. It is constituted by the Central Ground Water Board (CGWB) and functions under the Ministry of Jal Shakti. Its mandate includes regulation of groundwater development and management, issuing no-objection certificates for groundwater extraction, and monitoring groundwater quality.

  • The CGWB is the apex national scientific agency for groundwater assessment, development, and management; it publishes annual National Groundwater Reports.
  • India is the world's largest groundwater user, extracting approximately 249 billion cubic metres (BCM) annually — more than the US and China combined.
  • The Model Groundwater (Sustainable Management) Bill, 2017 provides a framework for states to enact groundwater legislation; however, many states still lack comprehensive groundwater laws.
  • The Jal Jeevan Mission (JJM), targeting tap water supply to all rural households, depends heavily on groundwater sources — making contamination remediation a direct prerequisite for JJM objectives.
  • The Atal Bhujal Yojana (ABY), launched in 2020, focuses on community-level groundwater management in seven water-stressed states.

Connection to this news: The NGT's direction to the CGWA to track state-level mitigation measures reflects the institutional architecture of groundwater governance, where the CGWA sets the regulatory floor but states must execute on the ground. The order specifically addresses the execution gap.

Key Facts & Data

  • NGT established: 2010, under the National Green Tribunal Act, 2010
  • NGT directive date: April 17, 2026
  • Arsenic WHO safe limit: 10 µg/L; India BIS standard: 10 µg/L (50 µg/L permissible)
  • Fluoride BIS desirable limit: 1 mg/L; maximum permissible: 1.5 mg/L
  • Bihar arsenic-affected: 4,709 wards; fluoride: 3,789 wards
  • West Bengal: arsenic in 8 districts, fluoride in 7 districts
  • Uttar Pradesh: both contaminants in 16 districts each
  • Karnataka: arsenic in 20 villages; fluoride in >2,083 villages
  • People exposed to unsafe arsenic levels in India: ~21 million (estimated)
  • India's annual groundwater extraction: ~249 BCM (world's largest)
  • CGWA constituted under: Environment (Protection) Act, 1986
  • Regulatory body directing implementation: Central Ground Water Authority (CGWA), under Ministry of Jal Shakti
On this page
  1. What Happened
  2. Static Topic Bridges
  3. National Green Tribunal (NGT) — Powers, Composition, and Jurisdiction
  4. Arsenic and Fluoride Contamination — Sources, Health Impacts, and Geology
  5. Central Ground Water Authority (CGWA) and Groundwater Governance in India
  6. Key Facts & Data
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