EWG's Tap Water Database
2021 Update

BREAKING: March 14, 2023 – The Environmental Protection Agency recently proposed new limits to tackle drinking water contamination from the toxic "forever chemicals" known as PFAS. The proposal targets six notorious PFAS: PFOA, PFOS, PFNA, PFHxS, PFBS and GenX.

The limits, known as maximum contaminant levels, or MCLs, are the highest level of a contaminant allowed in drinking water. The MCLs announced are 4 parts per trillion, or ppt, for PFOA and 4 ppt for PFOS. For the other four PFAS the agency is proposing using a “hazard index” which is a tool used to address cumulative risks from mixtures of chemicals.