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The EPA limits are extremely low—parts per trillion—reflecting the health risks associated with these chemicals. For context, 1 part per trillion is equivalent to one drop of water in 20 Olympic-sized swimming pools.
As of May 2026, proposed extensions mean that while water utilities must begin monitoring and public reporting by 2027, they may not be required to have filtration systems built until 2029 or 2031. Furthermore, the EPA has proposed rescinding the rules for PFHxS, PFNA, and GenX, meaning only PFOA and PFOS would be regulated.
If you are on a municipal supply, you will eventually receive notices about your water's PFAS levels. If you have a private well, you are responsible for your own testing.