PFAS above EPA’s limits in Missouri.

6 utilities of the 225 EPA tested in Missouri 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

6 utilities serving 73,399 people, as they report it, had a location averaging above a limit, most often PFOS (4) and PFOA (2). The largest is St Peters PWS, whose highest PFOA average was 4.8 ppt, 1.2 times the limit. The furthest above is St Robert PWS, at 2.8 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.

Missouri utilities above a 2024 PFAS limit
Utility	Based in	Serves	Above	Highest location average	Highest single sample
St Peters PWS	St. Peters	52,575	PFOA	PFOA 4.8 ppt1.2 times the limit	4.9 ppt
Ralls County PWSD 1	Hannibal	7,662	PFOA	PFOA 5.3 ppt1.3 times the limit	6.3 ppt
St Robert PWS	St. Robert	5,192	PFOS	PFOS 11 ppt2.8 times the limit	12 ppt
Camdenton PWS	Camdenton	3,960	PFOS	PFOS 10 ppt2.5 times the limit	10 ppt
St James PWS	St. James	3,935	PFOS	PFOS 5.0 ppt1.2 times the limit	9.9 ppt
Circle C MHP	Beaufort	75	PFOS	PFOS 5.0 ppt1.3 times the limit	5.9 ppt

3 more utilities in Missouri 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.

Utilities above a limit

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