PFAS · North Dakota
PFAS in North Dakota drinking water: EPA’s final survey results
EPA’s national PFAS survey (UCMR 5) tested 41 of the community water systems that serve homes in North Dakota. 7 found at least one of 29 PFAS above the laboratory reporting level, and 0 had a PFOA or PFOS sampling-location yearly average at or above EPA’s 4.0 ppt limit. Samples were collected from January 2023 to December 2025.
Data as of EPA UCMR 5 final release, August 2026 (file dated Aug 28, 2026) · EPA SDWIS 2026Q2 (file dated Jul 9, 2026). How we build these pages
PFBA was the compound North Dakota community systems found most often: 6 of 41 tested systems measured it above the reporting level. Across the country, 35% of surveyed community systems found at least one PFAS; in North Dakota the share is 17%. The largest North Dakota system with a detection, Grand Forks Regional WTP, serves 57,339 people and found 1 of the 29 compounds.
Which PFAS were found most often in North Dakota
Each row counts the North Dakota community water systems where that compound was measured above the reporting level at least once. A detection is a measurement, not a violation: most of these compounds have no federal limit.
North Dakota systems with the most PFAS found
The 7 surveyed community water systems that found the most different PFAS, with PFOA and PFOS compared to EPA’s 4.0 ppt limits on the yearly average at the highest sampling location. Larger systems come first when counts tie.
| Water system | People served | PFAS found (of 29) | PFOA | PFOS |
|---|---|---|---|---|
| Grand Forks Regional WTP ND1800410 | 57,339 | 1 | — not detected above the reporting level | — not detected above the reporting level |
| North Prairie Rwd-System 1&2 ND5101125 | 7,748 | 1 | — not detected above the reporting level | — not detected above the reporting level |
| Northwest Rural Water District ND5301079 | 5,102 | 1 | — not detected above the reporting level | — not detected above the reporting level |
| Grafton City of ND5000408 | 4,284 | 1 | — not detected above the reporting level | — not detected above the reporting level |
| Cass Rural Water District Fargo ND0901483 | 4,242 | 1 | — not detected above the reporting level | — not detected above the reporting level |
| South Central Regional Water District ND0801154 | 3,700 | 1 | — not detected above the reporting level | — not detected above the reporting level |
| Central Plains Water District ND5201309 | 3,504 | 1 | — not detected above the reporting level | — not detected above the reporting level |
Counties with the most systems that found PFAS
- Cass County 1 of 5 surveyed systems
- Burleigh County 1 of 4 surveyed systems
- Grand Forks County 1 of 4 surveyed systems
- Ward County 1 of 2 surveyed systems
- Williams County 1 of 3 surveyed systems
- Walsh County 1 of 1 surveyed systems
- Wells County 1 of 1 surveyed systems