# HFPO-DA (commonly known as GenX Chemicals) — Drinking water contaminant limits by regulator

For HFPO-DA (commonly known as GenX Chemicals), regulator is US EPA (National Primary Drinking Water Regulations); limit is 10 ppt; unit is ppt; limit type is MCL (Maximum Contaminant Level), recorded from its source on 2026-08-06.

- **Contaminant:** HFPO-DA (commonly known as GenX Chemicals) _(verified: appears in the quote below)_
- **Regulator:** US EPA (National Primary Drinking Water Regulations) _(our reading, not quoted from the source)_
- **Limit:** 10 ppt _(verified: appears in the quote below)_
- **Unit:** ppt _(verified: appears in the quote below)_
- **Limit type:** MCL (Maximum Contaminant Level) _(our reading, not quoted from the source)_

## What the source says

> HFPO-DA (commonly known as GenX Chemicals) | 10 ppt | 10 ppt

## 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/).