Treasure County, Montana — public water systems
At a glance
3 active public water systems are filed under Treasure County, Montana in EPA's SDWIS records, together reporting 1,162 people served. The largest is Hysham Rest Area Westbound, which reports serving 500 people. 1 is a community water system serving people where they live; the other 2 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
3
Population served
1.2K
Community systems
1
Groundwater share
66.7%
How does Treasure County compare with other Montana counties?
Treasure County has the 54th-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 1,162 people served in total, the 47th-largest county figure in the state and 0.1% of the statewide total. The average system here reports serving 387 people, about 21% 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 Treasure County's drinking water come from?
By primary water source, Treasure County's active systems draw on groundwater (2, 67%) and surface water (1, 33%). 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, Hysham Rest Area Westbound, draws primarily on groundwater.
What kinds of water systems operate in Treasure County?
Treasure County's active systems break down as 1 community systems (33%) and 2 transient non-community systems (67%). 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 state government (67%) and local government (33%).
Water systems in Treasure County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Hysham Rest Area Westbound | Treasure | 500 | Transient non-community | Groundwater |
| 2 | Hysham Rest Area Eastbound | Treasure | 400 | Transient non-community | Groundwater |
| 3 | Hysham Town of | Treasure | 262 | Community | Surface water |
Treasure County water systems: frequently asked questions
How many public water systems are in Treasure County, Montana?
EPA's SDWIS records file 3 active public water systems under Treasure County, Montana: 1 community systems (33%) and 2 transient non-community systems (67%).
Who supplies drinking water in Treasure County, MT?
The largest community water system filed under Treasure County is Town of Hysham (262 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 Treasure County's drinking water come from groundwater or surface water?
Of the 3 active public water systems in Treasure County, 67% draw mainly on groundwater and 33% on surface water, counting purchased supplies. The largest system, Hysham Rest Area Westbound, uses groundwater.
Where can I find a water quality report for Treasure 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. 1 community system is filed under Treasure 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 Treasure 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 Treasure County, Montana”, https://aquacensus.com/water-systems/montana/treasure (data as of October 1, 2026).