Why in news?

Polyfluoroalkyl substances (PFAS) — commonly called “forever chemicals” — have been found in water sources across multiple Indian states, yet India’s water treatment systems and regulatory framework remain ill-equipped to detect or remove them.

With no PFAS-specific drinking-water limit currently in place, this emerging contamination issue carries significant public health and policy implications.

What’s in Today’s Article?

• What Are PFAS?
• Health Concerns: What We Know
• Evidence of Contamination Across India
• Why Treatment Systems Are Failing?
• India’s Regulatory Response: Work in Progress

What Are PFAS?

• PFAS are synthetic chemical compounds containing multiple carbon-fluorine bonds.
• Used widely in coatings, textiles, and industrial products.
• Notorious for resisting degradation — they can contaminate the environment for decades, earning the “forever chemicals” label.
• PFAS have existed for 60 years, yet regulation has lagged behind their spread.

Health Concerns: What We Know?

• In 2025, the International Agency for Research on Cancer (IARC) classified:
  • Perfluorooctanoic acid (PFOA) as “carcinogenic to humans.”
  • Perfluorooctanesulfonic acid (PFOS) as “possibly carcinogenic to humans.”
• Important caveat: Merely detecting PFAS in water doesn’t indicate health risk by itself — risk depends on the type of PFAS, dose, duration, and route of exposure.
  • A February 2026 study found that a mix of 24 PFAS compounds delayed zebrafish egg hatching, inhibited offspring growth, accumulated in blood, and reduced heart rates — raising concerns about broader ecological and health impacts.

Evidence of Contamination Across India

• A 2025 review in the Journal of Hazardous Materials Advances examined monitoring across Gujarat, Maharashtra, Tamil Nadu, and West Bengal.
• Key finding: PFAS contamination is a “legitimate concern,” but its national extent remains poorly defined — partly due to inconsistent testing and analysis methods across research groups.
• IIT-Madras Study (2024)
  • Analysed 14 water samples (2022–23) from groundwater, surface water, and four stages of a water treatment plant.
  • Groundwater near garbage dumps showed the highest PFAS levels.
  • Startling finding: PFAS concentrations were 5% to 103% HIGHER in treated water than raw water — suggesting treatment processes may convert unidentified precursors into more stable PFAS.
  • Researchers noted the 8 target PFAS tested represent only a fraction of potentially diverse fluorinated compounds present — broader testing beyond fixed lists is needed.

Why Treatment Systems Are Failing?

• Conventional biological wastewater treatment cannot remove PFAS.
• Adsorption-based treatment shows potential but low-cost materials for PFAS capture are still under development.
• Testing against a fixed list of PFAS risks missing undetected substances, since precursors can transform into other PFAS over time.
• High-resolution mass spectrometry can help identify PFAS beyond fixed lists, but requires care since PFAS can contaminate samples during collection/analysis itself.

India’s Regulatory Response: Work in Progress

• The Union Environment Ministry has confirmed there is no specific regulation banning PFAS manufacturing.
• India has no PFAS-specific drinking-water limit under the current IS 10500:2012 standard — though this standard is under revision.
• The Bureau of Indian Standards (BIS) has formed a dedicated Working Group on Emerging Contaminants and Forever Chemicals to examine PFAS limits.
• Scope and specific PFAS to be regulated have not yet been finalised; analytical testing methods are also under consideration.
• CSIR-Indian Institute of Toxicology Research (IITR), Lucknow is participating in a UNEP-funded National Implementation Plan to build baseline PFAS data, and has developed capability to detect 50 multi-class PFAS molecules.

Conclusion

India’s PFAS problem is a textbook case of regulation lagging behind contamination. Multiple independent studies have already flagged forever chemicals in groundwater, treated water, and coastal sewage, yet no enforceable drinking-water limit exists, and conventional treatment plants may even be inadvertently creating more stable PFAS compounds.

With global health agencies now classifying key PFAS as carcinogenic, experts agree that waiting for complete exposure data before acting is no longer a defensible position — India needs precautionary interim limits, harmonised testing standards, and a clear accountability framework, well before full contamination mapping is complete.