PFAS above EPA’s limits in Mississippi.

5 utilities of the 231 EPA tested in Mississippi 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

5 utilities serving 84,633 people, as they report it, had a location averaging above a limit, most often PFOS (4) and PFOA (4). The largest is City of Oxford, whose highest PFOS average was 53 ppt, 13 times the 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.

Mississippi utilities above a 2024 PFAS limit
Utility	Based in	Serves	Above	Highest location average	Highest single sample
City of Oxford	Oxford	28,500	PFOA, PFOS	PFOS 53 ppt13 times the limit	72 ppt
University of Mississippi	Oxford	26,874	PFOA	PFOA 5.3 ppt1.3 times the limit	5.5 ppt
City of Corinth	Corinth	15,000	PFOA, PFOS	PFOS 5.3 ppt1.3 times the limit	11 ppt
City of Holly Springs	Holly Springs	9,779	PFOA, PFOS	PFOS 9.4 ppt2.4 times the limit	9.6 ppt
Smiths Crossing Water Assn	Magee	4,480	PFOS	PFOS 5.4 ppt1.4 times the limit	11 ppt

2 more utilities in Mississippi 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

Where to go next