Tapcensus

North Dakota drinking water quality

North Dakota has 388 active public water systems serving 744K people. 178 of them, 46%, had at least one EPA violation in the past three years, 55 have an unresolved violation today, and 1 are designated serious violators by the EPA.

Active systems 388 in 52 counties
People served 744K 319 community systems serve 736K
Violations, past 3 years 178 46% of active systems
Serious violators 1 2 systems carry a health flag

Largest counties

All 52 counties
CountyPeople servedSystemsWith violations
Cass176,764279
Burleigh92,574125
Grand Forks69,78795
Ward65,645147
Williams38,3662211
Stark36,50686
Morton29,721134
Stutsman22,00893
Richland15,546145
Ramsey12,60330

Largest community water systems

All 388 systems
SystemServesStatus
Fargo City of
Cass County		 120,762
Bismarck City of
Burleigh County		 72,417
Grand Forks Regional Wtp
Grand Forks County		 57,339
Minot City of
Ward County		 48,743
West Fargo City of
Cass County		 34,858
Williston City of
Williams County		 26,426
Dickinson City of
Stark County		 25,679
Mandan City of
Morton County		 21,769
Jamestown City of
Stutsman County		 15,427
Belcourt-Turtle Mtn Rural Water System
 13,500

About the North Dakota data

Retrieved from EPA ECHO on Oct 11, 2026.

Most common violations in North Dakota

Revised Total Coliform Rule (RTCR)84 systemsLead and Copper Rule (LCR)38 systemsChlorine (MRDL)32 systemsChloramine26 systemsConsumer Confidence Rule (CCR)20 systems
All contaminants and rules in North Dakota

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