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McCone County, Montana — public water systems

At a glance

6 active public water systems are filed under McCone County, Montana in EPA's SDWIS records, together reporting 1,161 people served. The largest is Town of Circle, which reports serving 644 people. 2 are community water systems serving people where they live; the other 4 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

6

Population served

1.2K

Community systems

2

Groundwater share

83.3%

How does McCone County compare with other Montana counties?

McCone County has the 47th-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 1,161 people served in total, the 48th-largest county figure in the state and less than 0.1% of the statewide total. The average system here reports serving 194 people, about 60% 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 McCone County's drinking water come from?

By primary water source, McCone County's active systems draw on groundwater (3, 50%), purchased groundwater (2, 33%) and surface water (1, 17%). Overall, 83% rely mainly on groundwater (including purchased groundwater) and 17% 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, Town of Circle, draws primarily on groundwater.

What kinds of water systems operate in McCone County?

McCone County's active systems break down as 2 community systems (33%) and 4 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 private (67%) and local government (33%).

Water systems in McCone County

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Active public water systems in McCone County, Montana
#Water systemCountyPopulation servedTypeSource
1Circle Town ofMcCone644CommunityGroundwater
2Dry Redwater Regional Water AuthorityMcCone365CommunityPurchased groundwater
3Brockway Supper ClubMcCone50Transient non-communityGroundwater
4Rock Creek Marina LLCMcCone50Transient non-communitySurface water
5Harrys Nite ClubMcCone27Transient non-communityGroundwater
6Circle Country MarketMcCone25Transient non-communityPurchased groundwater

McCone County water systems: frequently asked questions

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

EPA's SDWIS records file 6 active public water systems under McCone County, Montana: 2 community systems (33%) and 4 transient non-community systems (67%).

Who supplies drinking water in McCone County, MT?

The largest community water systems filed under McCone County are Town of Circle (644 people served) and Dry Redwater Regional Water Authority (365 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 McCone County's drinking water come from groundwater or surface water?

Of the 6 active public water systems in McCone County, 83% draw mainly on groundwater and 17% on surface water, counting purchased supplies. The largest system, Town of Circle, uses groundwater.

Where can I find a water quality report for McCone 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. 2 community systems are filed under McCone 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 McCone 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 McCone County, Montana”, https://aquacensus.com/water-systems/montana/mccone (data as of October 1, 2026).