North Dakota Water Quality
Drinking water data for all 53 counties.
Avg Water Score
71.6
State Grade
C
Counties with Data
52
of 53 total
All North Dakota Counties
| County | Water Score |
|---|---|
| Adams County | 86.0 |
| Barnes County | 86.0 |
| Billings County | 86.0 |
| Bowman County | 86.0 |
| Burleigh County | 86.0 |
| Cavalier County | 86.0 |
| Dunn County | 86.0 |
| Eddy County | 86.0 |
| Emmons County | 86.0 |
| Foster County | 86.0 |
| Golden Valley County | 86.0 |
| Grand Forks County | 86.0 |
| Grant County | 86.0 |
| Griggs County | 86.0 |
| Hettinger County | 86.0 |
| Kidder County | 86.0 |
| LaMoure County | 86.0 |
| Logan County | 86.0 |
| McIntosh County | 86.0 |
| McLean County | 86.0 |
| Mercer County | 86.0 |
| Morton County | 86.0 |
| Mountrail County | 86.0 |
| Nelson County | 86.0 |
| Oliver County | 86.0 |
| Pembina County | 86.0 |
| Pierce County | 86.0 |
| Ramsey County | 86.0 |
| Ransom County | 86.0 |
| Renville County | 86.0 |
| Richland County | 86.0 |
| Slope County | 86.0 |
| Stark County | 86.0 |
| Steele County | 86.0 |
| Towner County | 86.0 |
| Traill County | 86.0 |
| Walsh County | 86.0 |
| Ward County | 86.0 |
| Cass County | 69.7 |
| Williams County | 61.7 |
| McKenzie County | 57.5 |
| Stutsman County | 56.4 |
| Rolette County | 42.3 |
| Wells County | 39.6 |
| Divide County | 30.6 |
| Dickey County | 26.3 |
| McHenry County | 25.6 |
| Sargent County | 13.2 |
| Benson County | 12.3 |
| Burke County | 9.4 |
| Bottineau County | 7.9 |
| Sheridan County | 4.7 |
| Sioux County | — |
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Frequently Asked Questions
Which county in North Dakota has the best water quality?
Adams County has the highest water quality score in North Dakota at 86.0/100 (Grade: A), based on EPA SDWIS data.
Which county in North Dakota has the most water violations?
Sheridan County has among the lowest water quality scores in North Dakota at 4.7/100. See the individual county page for detailed violation history.
Is the tap water safe to drink in North Dakota?
North Dakota has an average water quality score of 71.6/100 based on EPA Safe Drinking Water Act compliance data. Individual county scores vary — check your specific county's page for detailed information.
What contaminants are found in North Dakota water supplies?
Drinking water quality varies by county and water system. The EPA Safe Drinking Water Information System (SDWIS) tracks violations for contaminants like lead, nitrates, bacteria, and disinfection byproducts. See individual county pages for specific contaminant and violation history.
Data Source
Water quality data sourced from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. Scores reflect compliance history and health-based violation counts.
Disclaimer: This data is informational only. It is not health, legal, or professional advice. For concerns about your specific water supply, contact your local water utility.