North Dakota tap water quality

320 community water systems serving 743,288 people.

Data: U.S. EPA · How we read the data · How we check it

systems with PFAS above a federal limit

people served by them

systems EPA tested for PFAS

systems above the lead action level

PFAS: EPA's 2023–2025 testing. Lead: results from the last five years.

Largest water systems in North Dakota

City of Fargo
120,762 people · Surface water · North Dakota
Lithium above screening levelAlso: 2 health-based violations since 2016
City of Bismarck
72,417 people · Groundwater under influence of surface water · North Dakota
Lithium above screening level
Grand Forks Regional Water Treatment Plant
57,339 people · Surface water · North Dakota
Lithium above screening level
City of Minot
48,743 people · Groundwater · North Dakota
Lead near 2027 levelAlso: Lithium above screening level
City of West Fargo
34,858 people · Purchased surface water · North Dakota
Lithium above screening level
City of Williston
26,426 people · Surface water · North Dakota
Lithium above screening level
City of Dickinson
25,679 people · Purchased surface water · North Dakota
Lithium above screening level
City of Mandan
21,769 people · Surface water · North Dakota
Lithium above screening level
City of Jamestown
15,427 people · Groundwater · North Dakota
Lithium above screening level
Belcourt-Turtle Mountain Rural Water System
13,500 people · Groundwater · North Dakota
Total trihalomethanes (TTHM) violationAlso: Lithium above screening level
South Central Rural Water District North Burleigh
10,400 people · Groundwater under influence of surface water · North Dakota
Lithium above screening level
Southwest Water Authority
8,537 people · Surface water · North Dakota
Lithium above screening level
City of Wahpeton
7,766 people · Groundwater · North Dakota
Lithium above screening level
North Prairie Rural Water District – System 1&2
7,748 people · Purchased groundwater · North Dakota
Lithium above screening level
City of Devils Lake
7,141 people · Groundwater · North Dakota
Lithium above screening level

North Dakota cities and towns

Most health-based violations since 2016

City of Maxbass
84 people · Groundwater · North Dakota
Total trihalomethanes (TTHM) violationsAlso: Coliform bacteria violation
Twin Buttes Water Plant
792 people · Surface water · North Dakota
Total trihalomethanes (TTHM) violations
City of Parshall
884 people · Surface water · North Dakota
Haloacetic acids (HAA5) violationsAlso: Total trihalomethanes (TTHM) violations
Four Bears Water System
1,200 people · Surface water · North Dakota
Total trihalomethanes (TTHM) violations
Spirit Lake Water Management Rws
4,400 people · Groundwater · North Dakota
Arsenic violationsAlso: Lithium above screening level
White Shield Water Treatment Plant
952 people · Surface water · North Dakota
Total trihalomethanes (TTHM) violations
City of Cathay
43 people · Groundwater · North Dakota
Coliform bacteria violationsAlso: Lead near 2027 level
City of Flaxton
66 people · Groundwater · North Dakota
Not in EPA's PFAS sampleAlso: 3 health-based violations since 2016
Sundale Hutterian Association
110 people · Groundwater · North Dakota
Arsenic violations
City of Oberon
105 people · Groundwater · North Dakota
Coliform bacteria violations
City of Fargo
120,762 people · Surface water · North Dakota
Lithium above screening levelAlso: 2 health-based violations since 2016
City of Woodworth
50 people · Purchased groundwater · North Dakota
Total trihalomethanes (TTHM) violations
Parshall-Lucky Mound Water System
720 people · Surface water · North Dakota
Total trihalomethanes (TTHM) violations
City of Goodrich
98 people · Groundwater · North Dakota
Coliform bacteria violations
City of Harwood
718 people · Groundwater · North Dakota
Total trihalomethanes (TTHM) violations

All North Dakota utilities on this site

Every North Dakota system serving 50,000+ people or with PFAS above a federal limit, A to Z. Download all 320 systems as CSV.

Questions

Does North Dakota tap water have PFAS?

EPA tested 41 community water systems in North Dakota for 29 PFAS between 2023 and 2025. 0 had at least one regulated PFAS detected, and 0 had an entry-point average above a 2024 federal limit. Those 0 systems serve about 0 people. Systems have until 2029 to meet the limits.

How many North Dakota water systems have violations?

38 systems in North Dakota had at least one health-based violation since 2016 (94 violations in total). 94 violations are currently listed as unaddressed.

Which North Dakota water systems are over the lead action level?

3 systems had a lead 90th percentile above the 15 ppb action level in their most recent results from the last five years. Lead depends on each home's pipes, so a test of your own tap is the only way to know your level.

Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.