# Colorado — PFOS, PFOA, and PFNA combined — 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 Colorado, state–chemical pair is Colorado — PFOS, PFOA, and PFNA combined; pfas compound is PFOS, PFOA, and PFNA combined; concentration limit (ppt) is 70; regulation type is guideline; stricter than federal mcl is n/a, recorded from its source on 2026-08-14.

- **State–chemical pair:** Colorado — PFOS, PFOA, and PFNA combined
- **State:** Colorado
- **PFAS compound:** PFOS, PFOA, and PFNA combined
- **Concentration limit (ppt):** 70 _(verified: appears in the quote below)_
- **Regulation type:** guideline
- **Stricter than federal MCL:** n/a _(our reading, not quoted from the source)_
- **Regulatory citation:** Colorado Translation Level

## What the source says

> Concentration level 70 ppt (stated in the regulation as 70 ng/L) Chemical(s) and type of regulation 3 PFAS substances combined: PFOS, PFOA, and PFNA (Guidance)

## Source

- https://www.bclplaw.com/en-US/events-insights-news/pfas-drinking-water-standards-state-by-state-regulations.html

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/).