EPA enforceable drinking-water MCL for PFOA and PFOS each; compliance for the two proposed to extend to 2031
4.0 pptobserved
| Value kind | observed — Reported measurements, counts, and specifications keep the precision and scope stated by their source; an exact specification is not treated as a range. |
|---|---|
| As of | 2026 |
| Source | EPA NPDWR (2024); EPA proposed compliance-extension rule (2026) · PFOA and PFOS section: retains 4.0-ppt MCLs and targets April 2031 for compliance |
| Review | checking…review by 2026-10-06 · standard cadence |
| Recorded changes | last 2026-06-29 |
| Claim id | epa-enforceable-drinking-water-mcl-for-pfoa-and |
Where the guide uses it
Not quoted in a chapter yet; it is kept in the curated register.
← Full numbers register — every date-stamped figure in the guide, with revision history.