All 36 systems had enough required samples to calculate a yearly average. 0 had at least one yearly average at or above a study benchmark; 36 did not.
EPA-based study benchmark: the unrounded cutoff this research uses to reproduce EPA’s January 2026 technical-assistance classification around the April 2024 federal levels. It is not a current standard or compliance finding and cannot determine household exposure or health risk.
Find your water system
ZIP codes are used only to route visitors to public water systems that reported serving them. Confirm the actual provider using a water bill or utility record.
System counts in North Dakota
Each count shows how many included water systems had a yearly average at or above the named study benchmark.
| Study benchmark | Systems at or above benchmark | Water systems included | Percent |
|---|---|---|---|
| PFOA: 4.05 ppt study benchmark (reproduces EPA classification around 4 ppt) | 0 | 36 | 0.0% |
| PFOS: 4.05 ppt study benchmark (reproduces EPA classification around 4 ppt) | 0 | 36 | 0.0% |
| PFHxS: 15 ppt study benchmark (reproduces EPA classification around 10 ppt) | 0 | 36 | 0.0% |
| PFNA: 15 ppt study benchmark (reproduces EPA classification around 10 ppt) | 0 | 36 | 0.0% |
| HFPO-DA: 15 ppt study benchmark (reproduces EPA classification around 10 ppt) | 0 | 36 | 0.0% |
| Hazard Index: 1.5 study benchmark with at least two detected components (reproduces EPA classification around 1) | 0 | 36 | 0.0% |
Community water systems with complete monitoring
“Complete monitoring” means at least one sampling location had all required samples needed for a yearly average. Each PWSID appears once, preventing double counting across ZIP associations.
| Public water system | PWSID | Population served | Primary source | Sampling locations | Study benchmark result |
|---|---|---|---|---|---|
| AGASSIZ WATER USERS DISTRICT | ND1801056 | 3,438 | Ground water | 1 | Below all study benchmarks |
| BARNES RURAL WATER DISTRICT | ND0201058 | 4,938 | Ground water | 1 | Below all study benchmarks |
| BEACH CITY OF | ND1700059 | 981 | Surface water purchased | 1 | Below all study benchmarks |
| BELCOURT-TURTLE MTN RURAL WATER SYSTEM | 083890023 | 13,500 | Ground water | 1 | Below all study benchmarks |
| BEULAH CITY OF | ND2900074 | 3,058 | Ground water | 1 | Below all study benchmarks |
| CASS RURAL WATER DISTRICT FARGO | ND0901483 | 4,242 | Surface water purchased | 1 | Below all study benchmarks |
| CASS RURAL WATER DISTRICT-PHASE I | ND0901060 | 3,658 | Ground water | 1 | Below all study benchmarks |
| CASS RURAL WATER DISTRICT-PHASE II | ND0901124 | 1,700 | Ground water | 1 | Below all study benchmarks |
| CENTRAL PLAINS WATER DISTRICT | ND5201309 | 3,504 | Ground water | 1 | Below all study benchmarks |
| DEVILS LAKE CITY OF | ND3600231 | 7,141 | Ground water | 1 | Below all study benchmarks |
| DICKINSON CITY OF | ND4500242 | 25,679 | Surface water purchased | 1 | Below all study benchmarks |
| EAST CENTRAL REGIONAL WD-GF | ND1801062 | 5,995 | Ground water | 1 | Below all study benchmarks |
| FARGO CITY OF | ND0900336 | 120,762 | Surface water | 1 | Below all study benchmarks |
| GRAFTON CITY OF | ND5000408 | 4,284 | Surface water | 1 | Below all study benchmarks |
| GRAND FORKS REGIONAL WTP | ND1800410 | 57,339 | Surface water | 1 | Below all study benchmarks |
| GREATER RAMSEY WATER DISTRICT | ND3601424 | 5,280 | Ground water | 1 | Below all study benchmarks |
| GRENORA CITY OF | ND5300425 | 244 | Ground water | 1 | Below all study benchmarks |
| JAMESTOWN CITY OF | ND4700498 | 15,427 | Ground water | 1 | Below all study benchmarks |
| LARIMORE CITY OF | ND1800550 | 1,346 | Ground water purchased | 1 | Below all study benchmarks |
| MANDAN CITY OF | ND3000596 | 21,769 | Surface water | 1 | Below all study benchmarks |
| MINOT CITY OF | ND5100660 | 48,743 | Ground water | 1 | Below all study benchmarks |
| MISSOURI WEST WATER SYSTEM | ND3001431 | 4,303 | Surface water purchased | 2 | Below all study benchmarks |
| NORTH PRAIRIE RWD-SYSTEM 1&2 | ND5101125 | 7,748 | Ground water purchased | 1 | Below all study benchmarks |
| NORTHEAST RWD- NORTH VALLEY BRANCH | ND3401128 | 3,422 | Ground water | 1 | Below all study benchmarks |
| NORTHWEST RURAL WATER DISTRICT, ND | ND5301079 | 5,102 | Surface water purchased | 1 | Below all study benchmarks |
| OMND WATER TREATMENT PLANT | ND2901491 | 4,168 | Surface water | 1 | Below all study benchmarks |
| SOUTH CENTRAL REGIONAL WATER DISTRICT | ND0801154 | 3,700 | Purchased ground water under influence of surface water source | 1 | Below all study benchmarks |
| SOUTH CENTRAL RWD NORTH BURLEIGH | ND0801502 | 10,400 | Groundwater under influence of surface water | 1 | Below all study benchmarks |
| SOUTH CENTRAL RWD-EMMONS | ND1501653 | 3,650 | Surface water | 1 | Below all study benchmarks |
| SOUTHEAST WUD (EAST) | ND3901068 | 4,225 | Ground water | 1 | Below all study benchmarks |
| SOUTHWEST WATER AUTHORITY | ND4501434 | 8,537 | Surface water | 1 | Below all study benchmarks |
| STUTSMAN RURAL WATER DISTRICT | ND4701303 | 5,550 | Ground water | 1 | Below all study benchmarks |
| VALLEY CITY CITY OF | ND0200958 | 6,585 | Surface water | 1 | Below all study benchmarks |
| WATFORD CITY CITY OF | ND2700990 | 6,390 | Surface water purchased | 1 | Below all study benchmarks |
| WEST FARGO CITY OF | ND0900999 | 34,858 | Surface water purchased | 1 | Below all study benchmarks |
| WILLISTON CITY OF | ND5301012 | 26,426 | Surface water | 1 | Below all study benchmarks |
What is included
Each active community water system with enough required samples for a yearly average is counted once, even if it is linked with several ZIP codes. This does not mean every home was tested. Private wells are excluded, and UCMR 5 did not comprehensively monitor every small system. This page does not apply North Dakota's state-specific standards or determine compliance. Use the official state or territory drinking-water program for current regulatory information.