Cities where PFOA hit the EPA 4 ppt limit
The EPA's 2024 rule set a Maximum Contaminant Level of 4 ppt for PFOA alone. Under UCMR5 (2023–2025), many utilities tested at or above that line — some far above. This list covers tracked metros on WaterCheckup with PFOA ≥ 3.8 ppt in federal monitoring tied to each city's anchor ZIP / UCMR5 PWSID.
PFOA is only one regulated PFAS compound. Cities can also show high 6:2 FTS or PFOS peaks without a PFOA MCL flag — see Sugar Land (672 ppt 6:2 FTS), worst PFAS cities, and top systems over MCL.
Sugar Land is the headline "at the limit" case: PFOA at 4.1 ppt (EPA MCL = 4 ppt) plus the highest peak 6:2 FTS reading of any large Texas system in UCMR5. Only NSF 58 reverse osmosis reliably removes short-chain PFAS at the tap.
Full Sugar Land water report →Source: EPA UCMR5 national monitoring (2023–2025). PFOA MCL = 4 ppt as of the April 2024 PFAS rule. City rows use each metro's resolved UCMR5 PWSID (anchor ZIP when UCMR5 exists, otherwise the best-matching monitored system). For your exact tap, run a free ZIP report — home plumbing can differ from utility averages.