What the EPA limit means
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No federal limit
The EPA has not set an enforceable numeric limit for this contaminant.
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Health goal (MCLG) — the level with no known health effect. It is a goal, not a legal limit, and is often zero for carcinogens.
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UCMR-5
Where these measurements come from. Hover the tag for the EPA programme and years.
Frequently asked questions about Pfta
What is Pfta in drinking water?
Pfta is monitored in US public drinking water under EPA rules. Each supplier's result is reported to the EPA and published here with its source and period.
Does the EPA limit Pfta?
The EPA has not set a numeric Maximum Contaminant Level for Pfta. It is still measured and reported, so levels can be compared between suppliers.
How common is Pfta in US tap water?
Of the 9,680 water suppliers with results on file, 0 detected Pfta — 0% of those tested.