# Mixtures containing two or more of PFHxS, PFNA, HFPO-DA, and PFBS — Drinking water contaminant limits by regulator

For Mixtures containing two or more of PFHxS, PFNA, HFPO-DA, and PFBS, regulator is US EPA (National Primary Drinking Water Regulations); limit is 1 (unitless) Hazard Index; unit is unitless; limit type is MCL (Maximum Contaminant Level), recorded from its source on 2026-08-06.

- **Contaminant:** Mixtures containing two or more of PFHxS, PFNA, HFPO-DA, and PFBS _(verified: appears in the quote below)_
- **Regulator:** US EPA (National Primary Drinking Water Regulations) _(our reading, not quoted from the source)_
- **Limit:** 1 (unitless) Hazard Index _(verified: appears in the quote below)_
- **Unit:** unitless _(verified: appears in the quote below)_
- **Limit type:** MCL (Maximum Contaminant Level) _(our reading, not quoted from the source)_

## 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: 2026-08-06. Review by: 2027-08-06.
Part of [Drinking water contaminant limits by regulator](https://referencesource.org/drinking-water-contaminant-limits/).