Cass County, North Dakota — public water systems
At a glance
27 active public water systems are filed under Cass County, North Dakota in EPA's SDWIS records, together reporting 176,764 people served. The largest is City of Fargo, which reports serving 120,762 people. 26 are community water systems serving people where they live; the other 1 are non-community systems, such as schools, workplaces, campgrounds and gas stations with their own supply.
Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.
Active systems
27
Population served
176.8K
Community systems
26
Groundwater share
85.2%
How does Cass County compare with other North Dakota counties?
Cass County has the 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 176,764 people served in total, the largest county figure in the state and 24% of the statewide total. The average system here reports serving 6,547 people, about 3.5 times 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 Cass County's drinking water come from?
By primary water source, Cass County's active systems draw on purchased groundwater (14, 52%), groundwater (9, 33%), purchased surface water (3, 11%) and surface water (1, 3.7%). Overall, 85% rely mainly on groundwater (including purchased groundwater) and 15% 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, City of Fargo, draws primarily on surface water.
What kinds of water systems operate in Cass County?
Cass County's active systems break down as 26 community systems (96%) and 1 transient non-community systems (3.7%). 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. A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. EPA lists their owner types as local government (70%) and private (30%).
Water systems in Cass County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Fargo City of | Cass | 120,762 | Community | Surface water |
| 2 | West Fargo City of | Cass | 34,858 | Community | Purchased surface water |
| 3 | Cass Rural Water District Fargo | Cass | 4,242 | Community | Purchased surface water |
| 4 | Cass Rural Water District-Phase I | Cass | 3,658 | Community | Groundwater |
| 5 | Casselton City of | Cass | 2,513 | Community | Purchased groundwater |
| 6 | Cass Rural Water District-Phase Ii | Cass | 1,700 | Community | Groundwater |
| 7 | Cass Rural Water District-Phase Iii | Cass | 1,682 | Community | Groundwater |
| 8 | Horace City of | Cass | 1,641 | Community | Purchased surface water |
| 9 | Mapleton City of | Cass | 1,320 | Community | Purchased groundwater |
| 10 | Harwood City of | Cass | 718 | Community | Groundwater |
| 11 | Kindred City of | Cass | 692 | Community | Purchased groundwater |
| 12 | Argusville City of | Cass | 475 | Community | Purchased groundwater |
| 13 | Arthur City of | Cass | 337 | Community | Purchased groundwater |
| 14 | Oxbow City of | Cass | 305 | Community | Groundwater |
| 15 | Hunter City of | Cass | 261 | Community | Purchased groundwater |
| 16 | Tower City City of | Cass | 253 | Community | Purchased groundwater |
| 17 | Davenport City of | Cass | 252 | Community | Purchased groundwater |
| 18 | Page City of | Cass | 232 | Community | Purchased groundwater |
| 19 | Buffalo City of | Cass | 188 | Community | Purchased groundwater |
| 20 | Grandin City of | Cass | 173 | Community | Purchased groundwater |
| 21 | Horseshoe Bend | Cass | 110 | Community | Purchased groundwater |
| 22 | Amenia City of | Cass | 94 | Community | Purchased groundwater |
| 23 | Riverdale Subdivision | Cass | 88 | Community | Groundwater |
| 24 | Gardner City of | Cass | 74 | Community | Purchased groundwater |
| 25 | Fradets Orchard Water System | Cass | 56 | Community | Groundwater |
| 26 | Country Acres Water Co | Cass | 50 | Community | Groundwater |
| 27 | Knickerbocker Liquor Locker | Cass | 30 | Transient non-community | Groundwater |
Cass County water systems: frequently asked questions
How many public water systems are in Cass County, North Dakota?
EPA's SDWIS records file 27 active public water systems under Cass County, North Dakota: 26 community systems (96%) and 1 transient non-community systems (3.7%).
Who supplies drinking water in Cass County, ND?
The largest community water systems filed under Cass County are City of Fargo (120,762 people served), City of West Fargo (34,858 people served) and Cass Rural Water District Fargo (4,242 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 Cass County's drinking water come from groundwater or surface water?
Of the 27 active public water systems in Cass County, 85% draw mainly on groundwater and 15% on surface water, counting purchased supplies. The largest system, City of Fargo, uses surface water.
Where can I find a water quality report for Cass 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. 26 community systems are filed under Cass 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 Cass 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 Cass County, North Dakota”, https://aquacensus.com/water-systems/north-dakota/cass (data as of October 1, 2026).