1. Why in the News?

Scientific research has highlighted the difficulty of detecting and removing PFAS from India's water resources.

In October 2026, discussions surrounding studies from Chennai and Visakhapatnam drew attention to the limitations of traditional water treatment and the possible presence of PFAS in water entering urban treatment systems.

1.1 IIT Madras Study

Research involving water samples from Chennai reported PFAS contamination in different water environments.

At one studied treatment plant, concentrations of all eight targeted PFAS were reported to be higher in treated water than in untreated incoming water.

The reported increases ranged from approximately 5% to 103%.

1.2 Why Could Concentrations Increase?

One scientific explanation is the transformation of PFAS precursor compounds into more stable, measurable PFAS during treatment.

Other factors, including sampling variability and chemical behaviour, must also be evaluated when interpreting individual measurements.

1.3 Regulatory Concerns

India's drinking-water specification IS 10500:2012 does not prescribe individual numerical limits for PFAS compounds.

This creates an important challenge for systematic testing, reporting and targeted regulatory action.

2. What Are Forever Chemicals?

Per- and polyfluoroalkyl substances are a large group of manufactured chemicals characterised by fluorinated carbon structures.

Many PFAS are exceptionally persistent because of strong carbon-fluorine bonds.

2.1 Why Are They Called Forever Chemicals?

The term forever chemicals refers to their resistance to natural environmental degradation.

Many PFAS persist for long periods in soil, water and other environmental media.

However, persistence and bioaccumulation vary across different PFAS compounds.

2.2 Important PFAS Examples

• PFOA: Perfluorooctanoic acid.
• PFOS: Perfluorooctane sulfonic acid.
• PFHxS: Perfluorohexane sulfonic acid.
• PFNA: Perfluorononanoic acid.
• PFBS: Perfluorobutane sulfonic acid.

2.3 Important Chemical Properties

• High environmental persistence.
• Resistance to many degradation processes.
• Water and oil repellency in various applications.
• Potential mobility through soil and water.
• Different bioaccumulation behaviour across compounds.

3. Major Sources of PFAS Pollution

PFAS have been used in industrial and consumer applications for decades.

3.1 Industrial Manufacturing

PFAS may be released during chemical production and manufacturing processes involving fluorinated materials.

3.2 Firefighting Foams

Certain aqueous film-forming firefighting foams have historically contained PFAS.

Contamination can occur around some airports, industrial installations and firefighting training areas.

3.3 Consumer Products

Some fluorinated substances have been used in:

• Non-stick cookware coatings.
• Water-resistant textiles.
• Stain-resistant materials.
• Grease-resistant packaging.
• Selected industrial coatings.

3.4 Waste Disposal Sites

Landfills and waste-processing facilities may contribute to PFAS contamination through leachate and wastewater.

3.5 Sewage and Industrial Effluents

PFAS released into wastewater systems may pass through conventional treatment processes and enter rivers or coastal waters.

3.6 Contaminated Groundwater

PFAS may migrate through soil and enter aquifers, potentially affecting groundwater used for drinking and irrigation.

4. Recent Research Findings in India

4.1 Chennai

Studies discussed in 2026 reported PFAS in several water environments in Chennai.

An IIT Madras investigation of fourteen water samples reported particularly concerning concentrations in groundwater near waste disposal locations.

At a studied water treatment facility, concentrations of eight targeted PFAS increased between raw water and treated water.

The reported increase of 5% to 103% illustrates how conventional treatment may not effectively eliminate certain contaminants.

4.2 Visakhapatnam

Research on coastal and wastewater environments near Visakhapatnam has identified several PFAS compounds.

One study examined 77 targeted PFAS and reported detection of 38 compounds in the sampled environment.

The findings raised concerns about wastewater contributions to coastal contamination.

4.3 Wider Indian Evidence

Previous investigations have identified PFAS in different environmental media across India, demonstrating the need for broader monitoring.

4.4 Limitations of the Evidence

These findings do not establish that all Indian drinking-water systems contain unsafe PFAS levels.

Reliable national conclusions require representative sampling, validated laboratory methods and comparisons with compound-specific health standards.

5. Why Do Conventional Water Treatment Plants Struggle?

Conventional treatment systems are mainly designed to remove suspended particles, improve clarity and control microbial contamination.

5.1 Coagulation and Flocculation

These processes help suspended materials aggregate into particles that can be separated from water.

Many dissolved PFAS are not removed efficiently by this approach.

5.2 Sedimentation

Sedimentation removes settleable particles, but many PFAS remain dissolved in water.

5.3 Sand Filtration

Conventional sand filters are useful for particles, but are generally not specifically designed to capture dissolved PFAS.

5.4 Chlorination

Chlorination is mainly used for disinfection.

It cannot be relied upon for effective destruction of persistent PFAS compounds.

5.5 Biological Treatment

Many PFAS resist conventional biological breakdown due to their chemical stability.

5.6 Transformation of Precursors

Some PFAS precursor chemicals can transform into persistent terminal PFAS during environmental or treatment processes.

This may result in higher measured concentrations of particular compounds.

6. Health and Ecological Risks of PFAS

The health effects of PFAS vary by compound, exposure level, duration and individual circumstances.

Research has associated exposure to certain PFAS with several adverse health outcomes.

6.1 Immune System

Exposure to some PFAS has been associated with reduced antibody responses to certain vaccines.

6.2 Cholesterol

Some studies have found associations between PFAS exposure and increased cholesterol levels.

6.3 Liver Effects

Certain PFAS exposures have been associated with changes in liver enzymes and other indicators of liver function.

6.4 Reproductive and Developmental Effects

Research has examined associations with pregnancy outcomes and developmental effects, including lower birth weight for some exposures.

6.5 Cancer Risk

Evidence concerning some well-studied PFAS, including PFOA, has raised concerns about cancer risk.

It is not scientifically accurate to assume that every PFAS has the same carcinogenic potential.

6.6 Ecological Consequences

• Contamination of aquatic ecosystems.
• Accumulation of certain PFAS in organisms.
• Exposure through aquatic food webs.
• Long-term environmental persistence.
• Potential effects on wildlife health.

7. Regulatory Framework in India

7.1 Bureau of Indian Standards

The Bureau of Indian Standards publishes IS 10500, the Indian drinking-water specification.

IS 10500:2012 includes requirements for various physical, chemical and microbiological water-quality parameters.

7.2 PFAS Regulatory Gap

The cited standard does not establish individual numerical limits for PFAS such as PFOA and PFOS.

This limits the availability of a dedicated national benchmark for routine PFAS compliance assessment.

7.3 Central Pollution Control Board

The Central Pollution Control Board performs important pollution monitoring and regulatory functions under India's environmental framework.

Strengthening PFAS surveillance may require coordination among pollution control boards, water authorities and accredited laboratories.

7.4 Water (Prevention and Control of Pollution) Act, 1974

The Water Act provides an important legal framework for the prevention and control of water pollution in India.

7.5 Environment (Protection) Act, 1986

The Environment (Protection) Act provides broad powers for environmental regulation and pollution-control measures.

7.6 Jal Jeevan Mission

Jal Jeevan Mission focuses on improving access to safe and adequate drinking water for rural households.

Monitoring emerging pollutants is relevant to the broader objective of reliable drinking-water quality.

7.7 National Monitoring Requirements

A stronger PFAS framework would require clear sampling protocols, validated detection methods, appropriate standards and reporting arrangements.

8. International Regulation of PFAS

8.1 Stockholm Convention

The Stockholm Convention is a global treaty addressing persistent organic pollutants.

Certain PFAS are covered by its international control provisions.

Relevant examples include PFOS, PFOA and PFHxS, subject to their respective listings and exemptions.

8.2 United States

The United States Environmental Protection Agency has developed drinking-water regulations and treatment guidance for selected PFAS.

Regulatory requirements and implementation timelines may change, so current official rules should be consulted.

8.3 European Union

The European Union has adopted controls addressing selected PFAS and drinking-water quality.

8.4 International Scientific Cooperation

Countries can cooperate on analytical methods, pollution monitoring, safer alternatives and advanced treatment research.

9. Advanced Technologies for PFAS Removal

Specialised technologies can substantially reduce many PFAS concentrations in drinking water.

9.1 Granular Activated Carbon

Granular activated carbon removes contaminants through adsorption onto porous carbon surfaces.

It can be effective for many longer-chain PFAS, but performance depends on water chemistry, operating conditions and filter replacement.

9.2 Ion Exchange Resins

Certain ion-exchange resins can capture negatively charged PFAS compounds.

Their effectiveness depends on compound characteristics, competing substances and resin management.

9.3 Reverse Osmosis

Reverse osmosis uses pressure-driven membranes to separate water from many dissolved contaminants.

Appropriately designed RO systems can achieve substantial removal of many PFAS.

9.4 Nanofiltration

Nanofiltration membranes can reject certain dissolved compounds, including selected PFAS, depending on membrane properties and water quality.

9.5 Emerging Destruction Technologies

Researchers are investigating technologies intended to destroy PFAS, including selected electrochemical, plasma-based and other advanced processes.

Many emerging methods require further evaluation of energy consumption, treatment effectiveness, byproducts and commercial scalability.

9.6 PFAS Waste Disposal

Removing PFAS from water does not always mean destroying them.

Contaminants captured in spent carbon, resin or membrane reject water require suitable management.

10. Challenges in Managing PFAS Pollution

10.1 Expensive Monitoring

PFAS measurement often requires specialised analytical instruments, trained personnel and quality-control procedures.

10.2 Numerous Compounds

PFAS represent a large chemical class with varying properties, complicating testing and regulation.

10.3 Treatment Costs

Advanced purification can require substantial capital expenditure and recurring operating costs.

10.4 Industrial Discharges

Inadequate controls on PFAS-containing industrial waste can undermine water-treatment efforts.

10.5 Contaminated Residues

Captured PFAS may remain concentrated in used filtration materials or waste streams.

10.6 Limited Public Awareness

Many communities may be unfamiliar with the significance of emerging dissolved chemical contaminants.

10.7 Lack of Comprehensive Data

More representative monitoring is necessary to estimate the scale of PFAS contamination across India's different water sources.

11. Why PFAS Pollution Matters for India

11.1 Drinking-Water Security

Clean drinking water is essential to public health and human development.

Emerging contaminants create additional water-quality challenges beyond conventional microbiological pollution.

11.2 Industrial Development

Sustainable industrialisation requires adequate management of chemical manufacturing and industrial effluents.

11.3 Urban Water Infrastructure

Urban treatment facilities may need improved monitoring and targeted upgrades where PFAS contamination is established.

11.4 Groundwater Protection

Groundwater contamination can be difficult and costly to remediate, increasing the importance of pollution prevention.

11.5 Sustainable Development Goals

Addressing PFAS contamination supports wider objectives concerning health, safe water and sustainable consumption.

• SDG 3: Good Health and Well-being.
• SDG 6: Clean Water and Sanitation.
• SDG 12: Responsible Consumption and Production.
• SDG 14: Life Below Water.

11.6 Environmental Justice

Communities near pollution sources may face unequal exposure risks, highlighting the importance of environmental justice.

12. Way Forward for India

1. National Monitoring: Develop representative PFAS monitoring programmes for drinking water, surface water and groundwater.
2. Drinking-Water Standards: Evaluate science-based, compound-specific PFAS standards and testing rules.
3. Industrial Source Control: Improve reporting and management of PFAS-containing discharges and waste.
4. Laboratory Capacity: Strengthen accredited analytical facilities and validated sampling methods.
5. Targeted Treatment: Apply advanced filtration where contamination measurements justify it.
6. Research and Innovation: Support Indian research into affordable detection, removal and destruction.
7. Waste Management: Establish suitable approaches for PFAS-contaminated residuals from treatment.
8. Polluter-Pays Principle: Consider appropriate accountability mechanisms for contamination attributable to identifiable sources.
9. Public Communication: Provide understandable, evidence-based information on local water quality.

13. UPSC Examination Relevance

14. UPSC Prelims Practice MCQs

15. UPSC Mains Practice Questions

Suggested Answer Framework

Introduction:

Define PFAS and explain their environmental persistence.

Body — Sources:

• Industrial production.
• Firefighting foams.
• Waste disposal sites.
• Consumer products.
• Wastewater discharges.

Body — Challenges:

• Resistance to conventional treatment.
• Expensive laboratory testing.
• Absence of specific drinking-water limits.
• Persistent contamination in water systems.
• Management of contaminated treatment residues.

Body — Solutions:

• Targeted PFAS monitoring.
• Source-control regulations.
• Activated carbon and ion exchange.
• Membrane filtration.
• Research and laboratory capacity.

Conclusion:

India needs a preventive, science-based and integrated approach to emerging chemical pollutants that combines monitoring, regulation and appropriate technology.

16. Conclusion

PFAS contamination represents an increasingly important environmental and public-health challenge because many compounds are persistent, mobile and difficult to remove using conventional treatment.

The Chennai research discussed in October 2026 demonstrates why treatment performance must be assessed for specific emerging contaminants rather than inferred from conventional water-quality indicators alone.

The issue also exposes regulatory and institutional questions concerning drinking-water standards, industrial pollution, laboratory capacity and treatment investment.

The long-term response should combine pollution prevention, credible monitoring, scientifically appropriate limits, cost-effective treatment and safe management of contaminated waste.

For UPSC aspirants, PFAS pollution offers a valuable case study connecting chemistry, environmental degradation, public health, regulatory governance and sustainable development.