Prairie County, Montana — public water systems
At a glance
7 active public water systems are filed under Prairie County, Montana in EPA's SDWIS records, together reporting 501 people served. The largest is Terry High School District No 5, which reports serving 133 people.
Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.
Active systems
7
Population served
501
Community systems
—
Groundwater share
100%
How does Prairie County compare with other Montana counties?
Prairie County has the 45th-most active public water systems among the 76 counties listed for active Montana systems in EPA records; among the 55 with 3 or more systems, the median has 16. Its systems report 501 people served in total, the 58th-largest county figure in the state and less than 0.1% of the statewide total. The average system here reports serving 72 people, well below the Montana average of 489. 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 Prairie County's drinking water come from?
By primary water source, Prairie County's active systems draw on groundwater (7, 100%). Overall, all rely mainly on groundwater (including purchased groundwater) and none on surface water, compared with 89% and 11% across Montana. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, Terry High School District No 5, draws primarily on groundwater.
What kinds of water systems operate in Prairie County?
Prairie County's active systems break down as 3 non-transient non-community systems (43%) and 4 transient non-community systems (57%). A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. 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 private (71%) and local government (29%).
Water systems in Prairie County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Terry High School District No 5 | Prairie | 133 | Non-transient non-community | Groundwater |
| 2 | Terry Downtown Wua | Prairie | 115 | Transient non-community | Groundwater |
| 3 | Prairie Community Hospital | Prairie | 80 | Non-transient non-community | Groundwater |
| 4 | Fallon Water Well Association | Prairie | 47 | Transient non-community | Groundwater |
| 5 | Bolin Elementary School Dist 5 | Prairie | 45 | Non-transient non-community | Groundwater |
| 6 | M & D Sprinklers | Prairie | 41 | Transient non-community | Groundwater |
| 7 | Diamond Motel and Campground LLC | Prairie | 40 | Transient non-community | Groundwater |
Prairie County water systems: frequently asked questions
How many public water systems are in Prairie County, Montana?
EPA's SDWIS records file 7 active public water systems under Prairie County, Montana: 3 non-transient non-community systems (43%) and 4 transient non-community systems (57%).
Does Prairie County's drinking water come from groundwater or surface water?
Of the 7 active public water systems in Prairie County, all draw mainly on groundwater and none on surface water, counting purchased supplies. The largest system, Terry High School District No 5, uses groundwater.
Where can I find a water quality report for Prairie 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.
How can I check violations for a water system in Prairie 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 Montana water systems
- All Montana public water systems· 2,378 active
- Judith Basin County· 8 systems
- Wheatland County· 8 systems
- Sheridan County· 8 systems
- Musselshell County· 7 systems
- Bingham County· 6 systems
- McCone County· 6 systems
- How to find out who supplies your drinking water
- How to find and read your annual water quality report
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 Prairie County, Montana”, https://aquacensus.com/water-systems/montana/prairie (data as of October 1, 2026).