PFAS Contamination in India

GS-III | Environment | Pollution | Environmental Health | Environmental Regulation

What are PFAS?

PFAS, or Polyfluoroalkyl Substances, are a type of man-made chemical compound that contains many carbon-fluorine bonds.

• Uses: Coatings, textiles, and several industrial products.
• Concern: The materials are resistant to decay and will remain in the environment for an extended period of time.

Key Concerns Regarding PFAS Contamination in India

• Widespread Environmental Concern: While studies in various regions of India indicate that there are PFAS present in water supplies, it is still uncertain how much of the country has been contaminated.
• No Standard Method for Monitoring: Due to variation in how different researchers test and analyse, it is difficult to determine the level of contamination.
• Groundwater Contamination: The study conducted by IIT-Madras in 2024 revealed that groundwater samples collected from residentially located wells adjacent to garbage dumps within Chennai exhibited the highest levels of PFAS.
• Challenges to Treating Water: The treatment plant at Chennai showed that there were higher amounts of the eight target PFAS compounds in treated water than in untreated water. These increases could indicate that some unidentified precursor compounds had been converted into more stable PFAS compounds within the treatment facility.
• Fixed-List Testing Limitations: Only testing for a specific group of PFAS could potentially miss identifying additional types of fluorinated compounds. Additionally, some precursor chemicals can convert to alternative forms of PFAS.
• Multiple Sources of Contamination: A research project conducted at Visakhapatnam determined that there were 38 different PFAS chemical compounds present in the 77 varieties tested in both marine and wastewater samples. The study concluded that approximately 41% of the median concentration of PFAS compounds found along the coastline can be attributed to wastewater discharge.
• Challenge of Identifying Sources of Pollution: Identifying the difference between industrial waste and municipal sewage will require taking samples of water near the areas where they mix together.
• Wastewater Treatment Challenges: Traditional biological wastewater treatment processes do not remove PFAS. Adsorption-based treatment approaches have shown promise for removing PFAS; however, there is a need to develop cost-effective adsorbents specifically for capturing PFAS.

Health and Environmental Implications

• Health Risks: The health risk associated with a PFAS is based upon the specific type of PFAS, the amount (dose) of PFAS to which an individual was exposed, how long the individual was exposed to the PFAS (duration), and how the individual came into contact with the PFAS (route of exposure).
• Carcinogenicity: IARC (International Agency for Research on Cancer) classified PFOA (Perfluorooctanoic acid) as ‘carcinogenic to humans’, and PFOS (Perfluorooctanesulfonic acid) as ‘possibly carcinogenic to humans’ in its 2025 monograph on carcinogenicity.
• Impact on Aquatic Organisms: A study that used a combination of 24 PFAS compounds showed delayed egg hatching of zebrafish; inhibited the development of zebrafish larvae; increased the levels of PFAS in the blood of zebrafish; and lowered the heart rate of zebrafish.
• Insufficient Exposure Data: India does not have enough baseline data to produce reliable estimates of the amount of exposure individuals experience with regards to PFAS.

Regulatory Gaps in India

• Absence of a specific manufacturing ban: The Union Environment Ministry has stated that there is currently no regulation prohibiting the manufacture of PFAS.
• No PFAS-specific drinking-water limit: India does not have a drinking-water limit for PFAS under the current IS 10500:2012 standard.
• Standard under revision: The Bureau of Indian Standards (BIS) has formed a special working group to investigate the standards for Polyfluoroalkyl substances (PFAS) and their related contaminants, called the “Working Group on Emerging Contaminants and Forever Chemicals.”
• Unfinalised Standards: There has not yet been a final decision made regarding which PFAS and how many will be included in the revised standard. In addition, the analytical methods to test for PFAS in drinking water are currently under consideration.
• Lack of a Clearly Defined Penalty System: To date, there has been no well-defined regulatory framework that would provide guidance on how to hold those who contribute to the contamination of PFAS accountable.
• Risk of incomplete regulation: A named-chemical approach could leave precursors and transformation products outside regulation.

Way Forward

• Establish Baseline Data: Determine what types of PFAS are manufactured in India, imported into India and utilised in India, as well as establishing a baseline for monitoring and conducting toxicology studies.
• Develop Standard Methods: Develop standard methods for monitoring and testing to enhance assessment of PFAS contamination in India.
• Broaden Testing: The use of precursors and other fluorinated compounds should be included in testing, rather than using only the limited number of PFAS currently being tested.
• Improve Source Identification: Utilise source-specific sampling methods, chemical fingerprinting techniques, and machine-learning models to identify differences between municipal wastewater and industrial wastes.
• Improve Detection: Utilise high-resolution mass spectrometry to identify the presence of per- and polyfluoroalkyl substances (PFAS) that are not on the predetermined list of compounds to be tested for, while also preventing contamination of samples when collected and analysed.
• Develop Affordable Treatment: Develop low-cost, adsorption-based materials that can be used to remove PFAS from water.
• Establish Enforceable Limits: Establish an enforceable limit on the use of PFAS, and possibly establish an interim precautionary limit for well-studied PFAS.
• Strengthen Accountability: Develop a clear regulatory framework to hold accountable those who cause PFAS contamination.
• Adopt broader regulation: In addition, ensure that the scope of regulatory review includes both PFAS precursors and their transformation products.

Conclusion

PFAS contamination in India is a legitimate environmental concern, but its national extent remains poorly defined due to gaps in monitoring, testing, and exposure data. Harmonised monitoring, broader screening, enforceable limits, affordable treatment technologies, and clear accountability mechanisms are essential to address the risks posed by these persistent chemicals.

Mains Question

Q.”PFAS contamination presents new challenges for environmental protection and public health in India.” Discuss the primary challenges related to the identification of PFAS, the treatment of PFAS, and the regulation of PFAS. Provide suggestions on how these challenges can be addressed.

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