North Dakota
Williams County drinking water quality
22 active public water systems serve 38,366 people in Williams County. 11 are compliant, 11 had at least one EPA violation in the past three years, 0 are designated serious violators, and 0 carry a health flag.
Community water systems
13 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Williston City of Williston |
26,426 | 0 | 0 | |
|
Northwest Rural Water District |
5,102 | 1 | 0 | |
|
Tioga City of Tioga |
2,202 | 0 | 0 | |
|
R & T Water System Ray, Tioga |
1,003 | 0 | 0 | |
|
Ray City of Ray |
950 | 0 | 0 | |
|
Trenton Water Users Assoc Trenton |
840 | 2 | 0 | |
|
Inspire Communities-Springbrook |
300 | 4 | 2 | |
|
Grenora City of Grenora |
244 | 0 | 0 | |
|
Prairie View HOA |
226 | 5 | 1 | |
|
Wildrose City of Wildrose |
110 | 0 | 0 | |
|
Fendee Estates |
30 | 2 | 0 | |
|
The Bluffs HOA |
30 | 2 | 0 | |
|
Western Area Water Supply Authority |
0 | 0 | 0 |
Non-community systems (9: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Glacier Potable Water |
500 | 0 | 0 | |
|
Missouri-Yellowstone Interpretive Center |
100 | 1 | 0 | |
|
Stallion Oilfield Services-Williston |
90 | 0 | 0 | |
|
13 Mile Center |
50 | 3 | 2 | |
|
Big Country RV Park |
48 | 0 | 0 | |
|
Little Beaver Bay Rec Area |
40 | 1 | 1 | |
|
Mondak Portables (water Hauler) |
30 | 0 | 0 | |
|
B & B RV |
25 | 1 | 0 | |
|
Little Egypt Campground |
20 | 1 | 0 |
Inactive systems (103, no longer operating or reporting)
Kept for the record and excluded from the county totals above. Browse inactive systems.
About this data
Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The North Dakota records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.