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PFAS above EPA’s limits in Colorado.

4 utilities of the 155 EPA tested in Colorado had a sampling location whose PFAS average was above a 2024 limit in its final UCMR 5 data, by EPA’s own method.

The short answer

4 utilities serving 101,207 people, as they report it, had a location averaging above a limit, most often PFOS (4) and Hazard Index (1). The largest is City of Brighton, whose highest PFOS average was 8.0 ppt, twice the limit. The furthest above is Snake River WD, at 4.4 times the PFOS limit.

These are EPA’s survey results, not violations: the limits take effect April 26, 2029, and compliance will rest on each utility’s own monitoring. EPA has proposed changes to the rule; as of Oct. 13, 2026, none is final.

Utilities above a limit

Largest first. Each one’s highest location average is for the limit it is furthest above, with the single highest sample of the same PFAS; its report has every result.

Colorado utilities above a 2024 PFAS limit
UtilityBased inServesAboveHighest location averageHighest single sample
City of BrightonBrighton56,304PFOSPFOS 8.0 ppttwice the limit11 ppt
Widefield WSDColorado Springs27,640PFOA, PFOS, PFHxS, Hazard IndexPFOS 12 ppt3 times the limit16 ppt
Snake River WDKeystone9,900PFOSPFOS 18 ppt4.4 times the limit22 ppt
Todd Creek Village MDBrighton7,363PFOSPFOS 5.4 ppt1.3 times the limit6.8 ppt

9 more utilities in Colorado had a single sample above a limit but no location average above, so they are not listed; each report shows the sample.

Results: EPA UCMR 5 occurrence data, file of Oct. 15, 2026, samples from Jan. 3, 2023 to June 17, 2026, averaged by sampling location as EPA’s final UCMR 5 data summary does. Every state, and the full data as a CSV; how this list is made. People served is what each utility reports.

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