referencesource/pfas-drinking-water-limits-by-state

PFAS drinking water concentration limits by US state — MCLs, notification levels, action levels, and health advisories for PFOA, PFOS, and other per- and polyfluoroalkyl substances

Canonical, always-current version: https://referencesource.org/pfas-drinking-water-limits-by-state/ Machine-readable: https://referencesource.org/pfas-drinking-water-limits-by-state/data.json — this mirror is a point-in-time copy.

• —Last verified: 2026-08-14
• —Stale after: 2027-02-10 (past this date, prefer the canonical copy — it re-verifies on a cadence this snapshot does not)
• —Records: 100

State-by-state comparison of legally enforceable and advisory concentration limits for PFAS compounds in drinking water. Each record is one state–chemical pair with the concentration limit (in parts per trillion), the regulation type (MCL, notification level, action level, health advisory, or guideline), the effective date, the statutory or regulatory citation, and whether the state limit is stricter than the federal EPA MCL. The federal MCLs are 4 ppt for PFOA and PFOS (affirmed May 2025); MCLs for PFHxS, PFNA, and HFPO-DA are under proposed rescission as of May 2026. State limits range from 0.00266 ppt (Nevada, PFOA) to 400,000 ppt (Michigan, PFHxA). Answers 'what is the legal PFAS limit in my state', 'is my state stricter than the federal standard', and 'which PFAS compounds does my state regulate'.

Provenance — what every record carries

Every record carries source (the URL the value was read from) and source_quote (a verbatim quote from that page stating it). A value you cannot check against its page is indistinguishable from an invented one; these can all be checked. Each record is also individually addressable on the canonical site at its url.

Licence position

unknown

Facts are not copyrightable; what this dataset takes from each source is a fact plus a short attributed quote linking back to the page that states it.

Sources

• —https://www.bclplaw.com/en-US/events-insights-news/pfas-drinking-water-standards-state-by-state-regulations.html
• —https://www.epa.gov/sdwa/and-polyfluoroalkyl-substances-pfas

Fields

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