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PFAS above EPA’s limits in Indiana.

6 utilities of the 219 EPA tested in Indiana 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 166,389 people, as they report it, had a location averaging above a limit, most often PFOA (5) and PFOS (2). The largest is South Bend Water Works, whose highest Hazard Index average was 1.58, 1.6 times the limit. The furthest above is Marysville Otisco Nabb Water Corp., at 3.4 times the PFOA 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.

Indiana utilities above a 2024 PFAS limit
UtilityBased inServesAboveHighest location averageHighest single sample
South Bend Water WorksSouth Bend115,000PFOA, PFHxS, Hazard IndexHazard Index 1.581.6 times the limit—
Ramsey Water Company, Inc.Ramsey16,475PFOAPFOA 4.6 ppt1.1 times the limit5.2 ppt
Brown County Water UtilityMorgantown15,368PFOA, PFOSPFOA 6.5 ppt1.6 times the limit13 ppt
Indiana American Water - CharlestownCharlestown8,658PFOAPFOA 13 ppt3.3 times the limit13 ppt
Marysville Otisco Nabb Water Corp.Marysville6,813PFOAPFOA 14 ppt3.4 times the limit15 ppt
West Terre Haute WaterWest Terre Haute4,075PFOSPFOS 6.7 ppt1.7 times the limit7.1 ppt

13 more utilities in Indiana 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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