What the EPA limit means
No federal limit
The EPA has not set an enforceable numeric limit for this contaminant.
—
Health goal (MCLG) — the level with no known health effect. It is a goal, not a legal limit, and is often zero for carcinogens.
UCMR-5
Where these measurements come from. Hover the tag for the EPA programme and years.
Where Pfdoa was found
The water suppliers reporting the highest levels, worst first. For lead and copper that is the 90th-percentile result the action level is written against; for Six-Year Review data, the 95th percentile of each system's samples.
| Supplier | City | State | Level vs EPA limit |
|---|---|---|---|
| Yabucoa Urbano | — | — | 0.0047 µg/L No EPA limit set |
| Jayuya Urbano | Jayuya | PR | 0.0045 µg/L No EPA limit set |
| Ponce Urbano | — | — | 0.0032 µg/L No EPA limit set |
| Healdsburg, City of | Healdsburg | CA | 0.0031 µg/L No EPA limit set |
Frequently asked questions about Pfdoa
What is Pfdoa in drinking water?
Pfdoa 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 Pfdoa?
The EPA has not set a numeric Maximum Contaminant Level for Pfdoa. It is still measured and reported, so levels can be compared between suppliers.
How common is Pfdoa in US tap water?
Of the 9,676 water suppliers with results on file, 4 detected Pfdoa — 0% of those tested.