Indiana PFAS results from EPA's final data
Report published Nov 14, 2026 · EPA UCMR 5 final data file of Oct 15, 2026 (samples collected 2023–2025) · Method · National results →
6 Indiana water systems serving 166,389 people had PFAS above a 2024 federal limit in EPA's final round of nationwide PFAS testing: 3% of the 219 Indiana systems tested, compared with 11% nationally.
Highest PFOA or PFOS averages in Indiana
- Marysville Otisco Nabb Water Corp. Otisco · PFOA13.5 ppt
- Indiana American Water – Charlestown Charlestown · PFOA13.1 ppt
- West Terre Haute Water West Terre Haute · PFOS6.65 ppt
- Brown County Water Utility Morgantown · PFOA6.45 ppt
- South Bend Water Works South Bend · PFOA5 ppt
- Ramsey Water Company, Inc. Ramsey · PFOA4.6 ppt
- Greenville Water Utility Galena · PFOA3.6 ppt
- Palmyra Water Works Palmyra · PFOA3.25 ppt
- Hanover Water Department Hanover · PFOA3.15 ppt
- Jackson County Water Utility Brownstown · PFOA3 ppt
- Indiana American Water – Terre Haute Terre Haute · PFOS2.6 ppt
- Elkhart Public Works and Utilities Elkhart · PFOA2.6 ppt
- Madison Water Department Madison · PFOA2.3 ppt
- Tell City Water Department Tell City · PFOA2.15 ppt
- Mishawaka Utilities Mishawaka · PFOS2.1 ppt
Chart data as a table
| System | ppt |
|---|---|
| Marysville Otisco Nabb Water Corp. · Otisco · PFOA | 13.5 |
| Indiana American Water – Charlestown · Charlestown · PFOA | 13.1 |
| West Terre Haute Water · West Terre Haute · PFOS | 6.65 |
| Brown County Water Utility · Morgantown · PFOA | 6.45 |
| South Bend Water Works · South Bend · PFOA | 5 |
| Ramsey Water Company, Inc. · Ramsey · PFOA | 4.6 |
| Greenville Water Utility · Galena · PFOA | 3.6 |
| Palmyra Water Works · Palmyra · PFOA | 3.25 |
| Hanover Water Department · Hanover · PFOA | 3.15 |
| Jackson County Water Utility · Brownstown · PFOA | 3 |
| Indiana American Water – Terre Haute · Terre Haute · PFOS | 2.6 |
| Elkhart Public Works and Utilities · Elkhart · PFOA | 2.6 |
| Madison Water Department · Madison · PFOA | 2.3 |
| Tell City Water Department · Tell City · PFOA | 2.15 |
| Mishawaka Utilities · Mishawaka · PFOS | 2.1 |
Largest systems above a limit
| # | System | People served |
|---|---|---|
| 1 | South Bend Water Works South Bend Above: PFOA, PFHxS, Hazard Index | 115,000 |
| 2 | Ramsey Water Company, Inc. Ramsey Above: PFOA | 16,475 |
| 3 | Brown County Water Utility Morgantown Above: PFOA, PFOS | 15,368 |
| 4 | Indiana American Water – Charlestown Charlestown Above: PFOA | 8,658 |
| 5 | Marysville Otisco Nabb Water Corp. Otisco Above: PFOA | 6,813 |
| 6 | West Terre Haute Water West Terre Haute Above: PFOS | 4,075 |
Which limits were exceeded
| PFAS | Federal limit | Systems above it |
|---|---|---|
| PFOA 162,314 people | 4 ppt | 5 |
| PFOS 19,443 people | 4 ppt | 2 |
| PFHxS 115,000 people | 10 ppt | 1 |
| PFNA | 10 ppt | 0 |
| GenX (HFPO-DA) | 10 ppt | 0 |
| Hazard Index 115,000 people | 1 | 1 |
"–" in the table above means not detected. A system can be above more than one limit. EPA proposed in May 2026 to rescind the PFHxS, PFNA, GenX and Hazard Index limits. That proposal is not final.
Data and how to cite it
- Download every Indiana water system as CSV (PFOA and PFOS averages, systems above a limit, lead, violations).
- EPA's source file: UCMR 5 occurrence data.
Suggested citation:
Tap Water Results, "Indiana PFAS results from EPA's final UCMR 5 data" (published Nov 14, 2026, EPA data file of Oct 15, 2026). https://tapwaterresults.com/pfas/indiana/
You're welcome to quote and republish these figures with a link back. Questions from reporters: see contact.
Method
For each system we average each entry point's UCMR 5 results (non-detects count as zero, complete sets of samples only) and compare the highest entry-point average with the 2024 federal limit, using EPA's rounding. This is how EPA compares UCMR 5 results to the limits in its own data summary, and our national counts match EPA's published table within 2% (how we check). Results are monitoring data from 2023–2025, not compliance determinations, and treatment installed since then is not reflected. Full method.
Questions
How many Indiana water systems have PFAS above the limit?
6 of the 219 Indiana community water systems EPA tested in 2023–2025 (3%) had at least one entry-point average above a 2024 federal PFAS limit. They serve 166,389 people. Nationally the share is 11%.
Are these systems violating the law?
Not yet. Systems have until 2029 to meet the 2024 limits, and EPA has proposed moving the PFOA and PFOS deadline to 2031 and rescinding the other limits. EPA's UCMR 5 results are monitoring data and do not determine compliance.
Which systems were tested?
EPA's UCMR 5 tested every community water system serving more than 3,300 people and a representative sample of smaller ones. Systems that were not tested have no federal result, which is not the same as having no PFAS.
All Indiana water systems → · National results → · PFAS results for every state →
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.