# Federal — PFHxS/PFNA/HFPO-DA/PFBS mixtures — 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

For Federal, state–chemical pair is Federal — PFHxS/PFNA/HFPO-DA/PFBS mixtures; pfas compound is PFHxS, PFNA, HFPO-DA, and PFBS mixtures; concentration limit (ppt) is 1 (Hazard Index); regulation type is MCL; stricter than federal mcl is n/a, recorded from its source on 2026-08-14.

- **State–chemical pair:** Federal — PFHxS/PFNA/HFPO-DA/PFBS mixtures
- **State:** Federal
- **PFAS compound:** PFHxS, PFNA, HFPO-DA, and PFBS mixtures
- **Concentration limit (ppt):** 1 (Hazard Index)
- **Regulation type:** MCL
- **Stricter than federal MCL:** n/a _(our reading, not quoted from the source)_
- **Effective date:** 2024-04-10
- **Regulatory citation:** PFAS National Primary Drinking Water Regulation, 89 FR 32532

## What the source says

> Mixtures containing two or more of PFHxS, PFNA, HFPO-DA, and PFBS | 1 (unitless) Hazard Index | 1 (unitless) Hazard Index

## Source

- https://www.epa.gov/sdwa/and-polyfluoroalkyl-substances-pfas

Last verified: 2026-08-14. Review by: 2027-02-10.
Part of [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](https://referencesource.org/pfas-drinking-water-limits-by-state/).