Mountrail County, North Dakota — public water systems
At a glance
4 active public water systems are filed under Mountrail County, North Dakota in EPA's SDWIS records, together reporting 1,436 people served. The largest is City of Stanley, which reports serving 1,138 people. All 4 are community water systems serving people where they live.
Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.
Active systems
4
Population served
1.4K
Community systems
4
Groundwater share
0%
How does Mountrail County compare with other North Dakota counties?
Mountrail County has the 38th-most active public water systems among the 61 counties listed for active North Dakota systems in EPA records; among the 49 with 3 or more systems, the median has 6. Its systems report 1,436 people served in total, the 39th-largest county figure in the state and 0.2% of the statewide total. The average system here reports serving 359 people, well below the North Dakota average of 1,864. Population figures are what each system reports; people served by more than one system, such as a wholesaler and the town that buys from it, are counted by each.
Where does Mountrail County's drinking water come from?
By primary water source, Mountrail County's active systems draw on purchased surface water (4, 100%). Overall, none rely mainly on groundwater (including purchased groundwater) and all on surface water, compared with 74% and 26% across North Dakota. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. The county's largest system, City of Stanley, draws primarily on purchased surface water.
What kinds of water systems operate in Mountrail County?
Mountrail County's active systems break down as 4 community systems (100%). A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. EPA lists their owner types as local government (75%) and private (25%).
Water systems in Mountrail County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Stanley City of | Mountrail | 1,138 | Community | Purchased surface water |
| 2 | Plaza City of | Mountrail | 171 | Community | Purchased surface water |
| 3 | Ross City of | Mountrail | 97 | Community | Purchased surface water |
| 4 | North Prairie Rwd System Iv | Mountrail | 30 | Community | Purchased surface water |
Mountrail County water systems: frequently asked questions
How many public water systems are in Mountrail County, North Dakota?
EPA's SDWIS records file 4 active public water systems under Mountrail County, North Dakota: 4 community systems (100%).
Who supplies drinking water in Mountrail County, ND?
The largest community water systems filed under Mountrail County are City of Stanley (1,138 people served), City of Plaza (171 people served) and City of Ross (97 people served). Which system serves a particular address depends on its service area, which EPA's SDWIS records do not include; a water bill or the local utility can confirm it.
Does Mountrail County's drinking water come from groundwater or surface water?
Of the 4 active public water systems in Mountrail County, none draw mainly on groundwater and all on surface water, counting purchased supplies. The largest system, City of Stanley, uses purchased surface water.
Where can I find a water quality report for Mountrail County?
Each community water system must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1, covering the previous calendar year. 4 community systems are filed under Mountrail County, so the report to look for is the one from the system that supplies your address.
How can I check violations for a water system in Mountrail County?
Open the system's profile from the list on this page. Each profile shows the most recent Safe Drinking Water Act violations in EPA's records, with plain-English labels and whether each one is resolved. For current compliance status, EPA ECHO is the primary source.
More North Dakota water systems
About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Public water systems in Mountrail County, North Dakota”, https://aquacensus.com/water-systems/north-dakota/mountrail (data as of October 1, 2026).