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Boise County, Idaho — public water systems

At a glance

55 active public water systems are filed under Boise County, Idaho in EPA's SDWIS records, together reporting 7,448 people served. The largest is Idpr Lucky Peak Sp Spring Shores, which reports serving 780 people. 20 are community water systems serving people where they live; the other 35 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

55

Population served

7.4K

Community systems

20

Groundwater share

87.3%

How does Boise County compare with other Idaho counties?

Boise County has the 11th-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 7,448 people served in total, the 29th-largest county figure in the state and 0.4% of the statewide total. The average system here reports serving 135 people, well below 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 Boise County's drinking water come from?

By primary water source, Boise County's active systems draw on groundwater (48, 87%) and surface water (7, 13%). Overall, 87% rely mainly on groundwater (including purchased groundwater) and 13% 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, Idpr Lucky Peak Sp Spring Shores, draws primarily on groundwater.

What kinds of water systems operate in Boise County?

Boise County's active systems break down as 20 community systems (36%), 5 non-transient non-community systems (9.1%) and 30 transient non-community systems (55%). 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 (89%), local government (3.6%), federal government (3.6%) and public/private partnership (1.8%).

The 50 largest water systems in Boise County

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Active public water systems in Boise County, Idaho
#Water systemCountyPopulation servedTypeSource
1Idpr Lucky Peak Sp Spring ShoresBoise780Transient non-communityGroundwater
2Bogus Basin Mtn ResortBoise750Non-transient non-communitySurface water
3Horseshoe Bend Water SupplyBoise750CommunitySurface water
4Idaho City Water DeptBoise531CommunitySurface water
5Wilderness Ranch Owners Association Inc.Boise525CommunitySurface water
6Terrace Lakes Water CompanyBoise475CommunityGroundwater
7Scriver Woods Homeowners AssnBoise310CommunityGroundwater
8Mountain View Water and Road AssnBoise305CommunityGroundwater
9Castle Mountain Creeks Owners AssnBoise250CommunitySurface water
10Garden Valley High SchoolBoise200Non-transient non-communityGroundwater
11Duquette Pines Homeowners AssociationBoise163CommunityGroundwater
12Crouch Community ChurchBoise160Transient non-communityGroundwater
13Valley Hi EstatesBoise140CommunityGroundwater
14Mores Creek Rim Ranch Water DistBoise140CommunitySurface water
15Rivers Point Property Owners AssnBoise140CommunitySurface water
16Starlight Mountain TheaterBoise100Transient non-communityGroundwater
17OspreyBoise100CommunityGroundwater
18LDS Garden Valley Meeting HouseBoise100Transient non-communityGroundwater
19Calvary Chapel of Garden ValleyBoise100Transient non-communityGroundwater
20Mountain Shadows Hoa Inc..Boise89CommunityGroundwater
21Garden Valley Ranchettes HomeownersBoise78CommunityGroundwater
22Usace Macks Creek ParkBoise75Transient non-communityGroundwater
23Karney Lakes ClubBoise70Transient non-communityGroundwater
24Ranch SubdBoise65CommunityGroundwater
25Sawtooth LodgeBoise65Transient non-communityGroundwater
26Horseshu Vue Ranch SubdBoise51CommunityGroundwater
27Clear Creek LodgeBoise50Transient non-communityGroundwater
28River Canyon RetreatBoise50Transient non-communityGroundwater
29LDS Camp GlenwoodBoise50Transient non-communityGroundwater
30Pinetop Church CampBoise50Transient non-communityGroundwater
31Ten Ax Subdivision Water AssnBoise44Transient non-communityGroundwater
32Shilo Ranch EstatesBoise44CommunityGroundwater
33Scenic Properties Water Assn Inc.Boise40CommunityGroundwater
34River at Pine TreeBoise40Non-transient non-communityGroundwater
35Boise Holcomb Water Users Assoc. Inc.Boise36CommunityGroundwater
36Cascade Raft and KayakBoise35Transient non-communityGroundwater
37Usfs Lowman Ranger Station PcBoise35Non-transient non-communityGroundwater
38Lowman InnBoise30Transient non-communityGroundwater
39Project PatchBoise30Non-transient non-communityGroundwater
40Hi De Ho Sports Trailer ClubBoise30Transient non-communityGroundwater
41Sourdough LodgeBoise25Transient non-communityGroundwater
42Riverpond CampgroundBoise25Transient non-communityGroundwater
43Haven Hot SpringsBoise25Transient non-communityGroundwater
44Garden Valley MotelBoise25Transient non-communityGroundwater
45Lowman Rv ParkBoise25Transient non-communityGroundwater
46Garden Valley ChevronBoise25Transient non-communityGroundwater
47Garden Valley LibraryBoise25Transient non-communityGroundwater
48Banks Store and CafeBoise25Transient non-communityGroundwater
49Crouch City Hall and CommunityBoise25Transient non-communityGroundwater
50Crouch City ofBoise25Transient non-communityGroundwater

All other water systems in Boise County (5)

The remaining active systems filed under Boise County, largest first, with the population each reports serving.

Boise County water systems: frequently asked questions

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

EPA's SDWIS records file 55 active public water systems under Boise County, Idaho: 20 community systems (36%), 5 non-transient non-community systems (9.1%) and 30 transient non-community systems (55%).

Who supplies drinking water in Boise County, ID?

The largest community water systems filed under Boise County are Horseshoe Bend Water Supply (750 people served), Idaho City Water Dept (531 people served) and Wilderness Ranch Owners Association Inc. (525 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 Boise County's drinking water come from groundwater or surface water?

Of the 55 active public water systems in Boise County, 87% draw mainly on groundwater and 13% on surface water, counting purchased supplies. The largest system, Idpr Lucky Peak Sp Spring Shores, uses groundwater.

Where can I find a water quality report for Boise 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. 20 community systems are filed under Boise 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 Boise 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 Boise County, Idaho”, https://aquacensus.com/water-systems/idaho/boise (data as of October 1, 2026).