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Rosebud County, Montana — public water systems

At a glance

15 active public water systems are filed under Rosebud County, Montana in EPA's SDWIS records, together reporting 7,415 people served. The largest is City of Colstrip, which reports serving 2,350 people. 4 are community water systems serving people where they live; the other 11 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

15

Population served

7.4K

Community systems

4

Groundwater share

66.7%

How does Rosebud County compare with other Montana counties?

Rosebud County has the 32nd-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 7,415 people served in total, the 28th-largest county figure in the state and 0.6% of the statewide total. The average system here reports serving 494 people, roughly in line with 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 Rosebud County's drinking water come from?

By primary water source, Rosebud County's active systems draw on groundwater (10, 67%), purchased surface water (3, 20%) and surface water (2, 13%). Overall, 67% rely mainly on groundwater (including purchased groundwater) and 33% 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, City of Colstrip, draws primarily on surface water.

What kinds of water systems operate in Rosebud County?

Rosebud County's active systems break down as 4 community systems (27%), 2 non-transient non-community systems (13%) and 9 transient non-community systems (60%). 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 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 (53%), local government (27%) and state government (20%).

Water systems in Rosebud County

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Active public water systems in Rosebud County, Montana
#Water systemCountyPopulation servedTypeSource
1Colstrip City ofRosebud2,350CommunitySurface water
2Forsyth City ofRosebud2,260CommunitySurface water
3St Labre Indian SchoolRosebud650CommunityGroundwater
4East Bound Hathaway Rest AreaRosebud600Transient non-communityGroundwater
5Wb Hathaway Rest AreaRosebud600Transient non-communityGroundwater
6Ashland Water and Sewer DistRosebud400CommunityGroundwater
7Western Energy CompanyRosebud200Non-transient non-communityGroundwater
8Rosebud School District No 12Rosebud100Non-transient non-communityGroundwater
9Longhorn BarRosebud75Transient non-communityPurchased surface water
10Forsyth Country ClubRosebud40Transient non-communityGroundwater
11LDS Church ForsythRosebud35Transient non-communityGroundwater
12Ingomar Water DistrictRosebud30Transient non-communityGroundwater
13Lions Park and SpringRosebud25Transient non-communityGroundwater
14Rosebud FoodsRosebud25Transient non-communityPurchased surface water
15Pichionnies Forsyth IgaRosebud25Transient non-communityPurchased surface water

Rosebud County water systems: frequently asked questions

How many public water systems are in Rosebud County, Montana?

EPA's SDWIS records file 15 active public water systems under Rosebud County, Montana: 4 community systems (27%), 2 non-transient non-community systems (13%) and 9 transient non-community systems (60%).

Who supplies drinking water in Rosebud County, MT?

The largest community water systems filed under Rosebud County are City of Colstrip (2,350 people served), City of Forsyth (2,260 people served) and St Labre Indian School (650 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 Rosebud County's drinking water come from groundwater or surface water?

Of the 15 active public water systems in Rosebud County, 67% draw mainly on groundwater and 33% on surface water, counting purchased supplies. The largest system, City of Colstrip, uses surface water.

Where can I find a water quality report for Rosebud 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 Rosebud 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 Rosebud 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

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 Rosebud County, Montana”, https://aquacensus.com/water-systems/montana/rosebud (data as of October 1, 2026).