Cavalier County, North Dakota — public water systems
At a glance
5 active public water systems are filed under Cavalier County, North Dakota in EPA's SDWIS records, together reporting 4,570 people served. The largest is Northeast Rwd-Langdon Branch, which reports serving 2,450 people. All 5 are community water systems serving people where they live.
Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.
Active systems
5
Population served
4.6K
Community systems
5
Groundwater share
100%
How does Cavalier County compare with other North Dakota counties?
Cavalier County has the 28th-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 4,570 people served in total, the 23rd-largest county figure in the state and 0.6% of the statewide total. The average system here reports serving 914 people, about half of 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 Cavalier County's drinking water come from?
By primary water source, Cavalier County's active systems draw on purchased groundwater (5, 100%). Overall, all rely mainly on groundwater (including purchased groundwater) and none on surface water, compared with 74% and 26% across North Dakota. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own. The county's largest system, Northeast Rwd-Langdon Branch, draws primarily on purchased groundwater.
What kinds of water systems operate in Cavalier County?
Cavalier County's active systems break down as 5 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 (80%) and private (20%).
Water systems in Cavalier County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Northeast Rwd-Langdon Branch | Cavalier | 2,450 | Community | Purchased groundwater |
| 2 | Langdon City of | Cavalier | 1,878 | Community | Purchased groundwater |
| 3 | Osnabrock City of | Cavalier | 134 | Community | Purchased groundwater |
| 4 | Milton City of | Cavalier | 58 | Community | Purchased groundwater |
| 5 | Nekoma City of | Cavalier | 50 | Community | Purchased groundwater |
Cavalier County water systems: frequently asked questions
How many public water systems are in Cavalier County, North Dakota?
EPA's SDWIS records file 5 active public water systems under Cavalier County, North Dakota: 5 community systems (100%).
Who supplies drinking water in Cavalier County, ND?
The largest community water systems filed under Cavalier County are Northeast Rwd-Langdon Branch (2,450 people served), City of Langdon (1,878 people served) and City of Osnabrock (134 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 Cavalier County's drinking water come from groundwater or surface water?
Of the 5 active public water systems in Cavalier County, all draw mainly on groundwater and none on surface water, counting purchased supplies. The largest system, Northeast Rwd-Langdon Branch, uses purchased groundwater.
Where can I find a water quality report for Cavalier 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. 5 community systems are filed under Cavalier 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 Cavalier 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 Cavalier County, North Dakota”, https://aquacensus.com/water-systems/north-dakota/cavalier (data as of October 1, 2026).