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Butte County, Idaho — public water systems

At a glance

15 active public water systems are filed under Butte County, Idaho in EPA's SDWIS records, together reporting 6,817 people served. The largest is Inl Nrf, which reports serving 1,765 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

6.8K

Community systems

4

Groundwater share

100%

How does Butte County compare with other Idaho counties?

Butte County has the 37th-most active public water systems among the 64 counties listed for active Idaho systems in EPA records; among the 47 with 3 or more systems, the median has 27. Its systems report 6,817 people served in total, the 35th-largest county figure in the state and 0.4% of the statewide total. The average system here reports serving 455 people, about half of the Idaho average of 899. 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 Butte County's drinking water come from?

By primary water source, Butte County's active systems draw on groundwater (15, 100%). Overall, all rely mainly on groundwater (including purchased groundwater) and none on surface water, compared with 96% and 4.1% across Idaho. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, Inl Nrf, draws primarily on groundwater.

What kinds of water systems operate in Butte County?

Butte County's active systems break down as 4 community systems (27%), 6 non-transient non-community systems (40%) and 5 transient non-community systems (33%). 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 federal government (67%), local government (27%) and state government (6.7%).

Water systems in Butte County

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Active public water systems in Butte County, Idaho
#Water systemCountyPopulation servedTypeSource
1Inl NrfButte1,765Non-transient non-communityGroundwater
2Arco City ofButte1,080CommunityGroundwater
3Inl IntecButte866Non-transient non-communityGroundwater
4Usps Craters of the Moon National ParkButte616Transient non-communityGroundwater
5Inl Atr ComplexButte605Non-transient non-communityGroundwater
6Inl CfaButte585Non-transient non-communityGroundwater
7Inl RwmcButte415Non-transient non-communityGroundwater
8Inl Tan CtfButte350Non-transient non-communityGroundwater
9Moore Water and Sewer AssnButte196CommunityGroundwater
10Itd Lost River Rest AreaButte150Transient non-communityGroundwater
11Butte City ofButte59CommunityGroundwater
12Howe TownsiteButte55CommunityGroundwater
13Inl Gun RangeButte25Transient non-communityGroundwater
14Inl CitrcButte25Transient non-communityGroundwater
15Inl Ebr 1Butte25Transient non-communityGroundwater

Butte County water systems: frequently asked questions

How many public water systems are in Butte County, Idaho?

EPA's SDWIS records file 15 active public water systems under Butte County, Idaho: 4 community systems (27%), 6 non-transient non-community systems (40%) and 5 transient non-community systems (33%).

Who supplies drinking water in Butte County, ID?

The largest community water systems filed under Butte County are City of Arco (1,080 people served), Moore Water and Sewer Assn (196 people served) and City of Butte (59 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 Butte County's drinking water come from groundwater or surface water?

Of the 15 active public water systems in Butte County, all draw mainly on groundwater and none on surface water, counting purchased supplies. The largest system, Inl Nrf, uses groundwater.

Where can I find a water quality report for Butte 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 Butte 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 Butte 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 Idaho 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 Butte County, Idaho”, https://aquacensus.com/water-systems/idaho/butte (data as of October 1, 2026).