Sweet Grass County, Montana — public water systems
At a glance
16 active public water systems are filed under Sweet Grass County, Montana in EPA's SDWIS records, together reporting 7,304 people served. The largest is Greycliff Rest Area Eastbound, which reports serving 2,500 people. 3 are community water systems serving people where they live; the other 13 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
16
Population served
7.3K
Community systems
3
Groundwater share
93.8%
How does Sweet Grass County compare with other Montana counties?
Sweet Grass County has the 28th-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 7,304 people served in total, the 29th-largest county figure in the state and 0.6% of the statewide total. The average system here reports serving 457 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 Sweet Grass County's drinking water come from?
By primary water source, Sweet Grass County's active systems draw on groundwater (15, 94%) and surface water (1, 6.3%). Overall, 94% rely mainly on groundwater (including purchased groundwater) and 6.3% 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, Greycliff Rest Area Eastbound, draws primarily on groundwater.
What kinds of water systems operate in Sweet Grass County?
Sweet Grass County's active systems break down as 3 community systems (19%), 1 non-transient non-community systems (6.3%) and 12 transient non-community systems (75%). 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 (81%), state government (13%) and local government (6.3%).
Water systems in Sweet Grass County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Greycliff Rest Area Eastbound | Sweet Grass | 2,500 | Transient non-community | Groundwater |
| 2 | Big Timber City of | Sweet Grass | 1,650 | Community | Surface water |
| 3 | Greycliff Rest Area Westbound | Sweet Grass | 1,000 | Transient non-community | Groundwater |
| 4 | Big Timber Koa | Sweet Grass | 600 | Transient non-community | Groundwater |
| 5 | Stillwater East Boulder | Sweet Grass | 380 | Non-transient non-community | Groundwater |
| 6 | Town Pump 1033 Big Timber # 2 | Sweet Grass | 318 | Transient non-community | Groundwater |
| 7 | Clydehurst Christian Ranch | Sweet Grass | 175 | Transient non-community | Groundwater |
| 8 | Camp on the Boulder | Sweet Grass | 150 | Transient non-community | Groundwater |
| 9 | Greycliff Mill | Sweet Grass | 150 | Transient non-community | Groundwater |
| 10 | Lazy K Bar Ranch | Sweet Grass | 69 | Transient non-community | Groundwater |
| 11 | Spring Creek Cg and Trout Ranch | Sweet Grass | 64 | Transient non-community | Groundwater |
| 12 | Town Pump Big Timber Super 8 | Sweet Grass | 63 | Transient non-community | Groundwater |
| 13 | Strobel Trailer Court | Sweet Grass | 60 | Community | Groundwater |
| 14 | Camp Mimanagish | Sweet Grass | 50 | Transient non-community | Groundwater |
| 15 | Cottonwood Estates | Sweet Grass | 50 | Community | Groundwater |
| 16 | Boulder River Roadkill | Sweet Grass | 25 | Transient non-community | Groundwater |
Sweet Grass County water systems: frequently asked questions
How many public water systems are in Sweet Grass County, Montana?
EPA's SDWIS records file 16 active public water systems under Sweet Grass County, Montana: 3 community systems (19%), 1 non-transient non-community systems (6.3%) and 12 transient non-community systems (75%).
Who supplies drinking water in Sweet Grass County, MT?
The largest community water systems filed under Sweet Grass County are City of Big Timber (1,650 people served), Strobel Trailer Court (60 people served) and Cottonwood Estates (50 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 Sweet Grass County's drinking water come from groundwater or surface water?
Of the 16 active public water systems in Sweet Grass County, 94% draw mainly on groundwater and 6.3% on surface water, counting purchased supplies. The largest system, Greycliff Rest Area Eastbound, uses groundwater.
Where can I find a water quality report for Sweet Grass 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. 3 community systems are filed under Sweet Grass 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 Sweet Grass 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
- Broadwater County· 20 systems
- Toole County· 18 systems
- Powell County· 17 systems
- Deer Lodge County· 16 systems
- Teton County· 16 systems
- Richland County· 16 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 Sweet Grass County, Montana”, https://aquacensus.com/water-systems/montana/sweet-grass (data as of October 1, 2026).