| Public water system | Population served |
|---|---|
| FARGO CITY OF | 120,762 |
| BISMARCK CITY OF | 72,417 |
| GRAND FORKS REGIONAL WTP | 57,339 |
| MINOT CITY OF | 48,743 |
| WEST FARGO CITY OF | 34,858 |
| WILLISTON CITY OF | 26,426 |
| DICKINSON CITY OF | 25,679 |
| MANDAN CITY OF | 21,769 |
| JAMESTOWN CITY OF | 15,427 |
| SOUTHWEST WATER AUTHORITY | 8,537 |
| WAHPETON CITY OF | 7,766 |
| DEVILS LAKE CITY OF | 7,141 |
| VALLEY CITY CITY OF | 6,585 |
| WATFORD CITY CITY OF | 6,390 |
| GREATER RAMSEY WATER DISTRICT | 5,280 |
| GRAFTON CITY OF | 4,284 |
| LINCOLN CITY OF | 4,257 |
| OMND WATER TREATMENT PLANT | 4,168 |
Largest first by population served, as each employer reports it to its federal registry.
Source: U.S. Environmental Protection Agency, Safe Drinking Water Information System (SDWIS/Fed), community water systems. Data captured October 2, 2026.
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