Boundary County, Idaho — public water systems
At a glance
18 active public water systems are filed under Boundary County, Idaho in EPA's SDWIS records, together reporting 11,390 people served. The largest is City of Bonners Ferry, which reports serving 3,367 people. 14 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
18
Population served
11.4K
Community systems
14
Groundwater share
66.7%
How does Boundary County compare with other Idaho counties?
Boundary County has the 33rd-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 11,390 people served in total, the 22nd-largest county figure in the state and 0.6% of the statewide total. The average system here reports serving 633 people, about 30% 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 Boundary County's drinking water come from?
By primary water source, Boundary County's active systems draw on groundwater (12, 67%) and surface water (6, 33%). Overall, 67% rely mainly on groundwater (including purchased groundwater) and 33% 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, City of Bonners Ferry, draws primarily on surface water.
What kinds of water systems operate in Boundary County?
Boundary County's active systems break down as 14 community systems (78%), 2 non-transient non-community systems (11%) and 2 transient non-community systems (11%). 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 (61%), local government (22%), public/private partnership (11%) and federal government (5.6%).
Water systems in Boundary County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Bonners Ferry City of | Boundary | 3,367 | Community | Surface water |
| 2 | Three Mile Water Dist | Boundary | 2,458 | Community | Groundwater |
| 3 | Cabinet Mountains Water Dist | Boundary | 2,335 | Community | Groundwater |
| 4 | Moyie Springs City of | Boundary | 1,123 | Community | Groundwater |
| 5 | Bee Line Water Assn Inc. | Boundary | 533 | Community | Surface water |
| 6 | Mission Creek Water Assn | Boundary | 263 | Community | Groundwater |
| 7 | Paradise Valley Water Assn | Boundary | 250 | Community | Surface water |
| 8 | Twenty Mile Creek Water Assn | Boundary | 225 | Community | Surface water |
| 9 | Elk Mountain Farms Backwoods | Boundary | 200 | Non-transient non-community | Groundwater |
| 10 | Skin Creek Water Assn | Boundary | 200 | Community | Surface water |
| 11 | Feist Creek Resort | Boundary | 100 | Transient non-community | Groundwater |
| 12 | Trow Creek Water Assn | Boundary | 98 | Community | Surface water |
| 13 | Moravia Water Assn | Boundary | 80 | Community | Groundwater |
| 14 | Curley Creek Water Assn | Boundary | 50 | Community | Groundwater |
| 15 | Deep Creek Water Company | Boundary | 30 | Community | Groundwater |
| 16 | Cow Creek Water Assn | Boundary | 28 | Community | Groundwater |
| 17 | Usfw Kootenai National Wildlife Ref | Boundary | 25 | Transient non-community | Groundwater |
| 18 | Elk Mountain Farms Tavern Farm | Boundary | 25 | Non-transient non-community | Groundwater |
Boundary County water systems: frequently asked questions
How many public water systems are in Boundary County, Idaho?
EPA's SDWIS records file 18 active public water systems under Boundary County, Idaho: 14 community systems (78%), 2 non-transient non-community systems (11%) and 2 transient non-community systems (11%).
Who supplies drinking water in Boundary County, ID?
The largest community water systems filed under Boundary County are City of Bonners Ferry (3,367 people served), Three Mile Water Dist (2,458 people served) and Cabinet Mountains Water Dist (2,335 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 Boundary County's drinking water come from groundwater or surface water?
Of the 18 active public water systems in Boundary County, 67% draw mainly on groundwater and 33% on surface water, counting purchased supplies. The largest system, City of Bonners Ferry, uses surface water.
Where can I find a water quality report for Boundary 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. 14 community systems are filed under Boundary 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 Boundary 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 Boundary County, Idaho”, https://aquacensus.com/water-systems/idaho/boundary (data as of October 1, 2026).