Aleutians West Census Area County, Alaska — public water systems
At a glance
6 active public water systems are filed under Aleutians West Census Area County, Alaska in EPA's SDWIS records, together reporting 10,464 people served. The largest is Unalaska Water System, which reports serving 9,400 people. 5 are community water systems serving people where they live; the other 1 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
10.5K
Community systems
5
Groundwater share
50%
How does Aleutians West Census Area County compare with other Alaska counties?
Aleutians West Census Area County has the 21st-most active public water systems among the 25 counties listed for active Alaska systems in EPA records; among the 24 with 3 or more systems, the median has 23. Its systems report 10,464 people served in total, the 13th-largest county figure in the state and 1.2% of the statewide total. The average system here reports serving 1,744 people, about 167% above the Alaska average of 653. 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 Aleutians West Census Area County's drinking water come from?
By primary water source, Aleutians West Census Area County's active systems draw on surface water (3, 50%), groundwater (2, 33%) and groundwater under influence of surface water (1, 17%). Overall, 50% rely mainly on groundwater (including purchased groundwater) and 50% on surface water, compared with 84% and 16% across Alaska. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. The county's largest system, Unalaska Water System, draws primarily on surface water.
What kinds of water systems operate in Aleutians West Census Area County?
Aleutians West Census Area County's active systems break down as 5 community systems (83%) and 1 non-transient non-community systems (17%). 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. EPA lists their owner types as Native American (67%), local government (17%) and private (17%).
Water systems in Aleutians West Census Area County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Unalaska Water System | Aleutians West Census Area | 9,400 | Community | Surface water |
| 2 | Offshore Systems, Dutch Harbor | Aleutians West Census Area | 535 | Non-transient non-community | Surface water |
| 3 | Saint Paul Water System | Aleutians West Census Area | 380 | Community | Groundwater |
| 4 | Saint George Water System | Aleutians West Census Area | 65 | Community | Groundwater |
| 5 | Atka | Aleutians West Census Area | 50 | Community | Surface water |
| 6 | Nikolski Village | Aleutians West Census Area | 34 | Community | Groundwater under influence of surface water |
Aleutians West Census Area County water systems: frequently asked questions
How many public water systems are in Aleutians West Census Area County, Alaska?
EPA's SDWIS records file 6 active public water systems under Aleutians West Census Area County, Alaska: 5 community systems (83%) and 1 non-transient non-community systems (17%).
Who supplies drinking water in Aleutians West Census Area County, AK?
The largest community water systems filed under Aleutians West Census Area County are Unalaska Water System (9,400 people served), Saint Paul Water System (380 people served) and Saint George Water System (65 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 Aleutians West Census Area County's drinking water come from groundwater or surface water?
Of the 6 active public water systems in Aleutians West Census Area County, 50% draw mainly on groundwater and 50% on surface water, counting purchased supplies. The largest system, Unalaska Water System, uses surface water.
Where can I find a water quality report for Aleutians West Census Area 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. 5 community systems are filed under Aleutians West Census Area 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 Aleutians West Census Area 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 Alaska water systems
- All Alaska public water systems· 1,322 active
- Lake and Peninsula Borough County· 15 systems
- Wade Hampton Census Area County· 13 systems
- Juneau City and Borough County· 10 systems
- Haines Borough County· 6 systems
- Aleutians East Borough County· 6 systems
- Sitka City and Borough County· 3 systems
- How to find out who supplies your drinking water
- How to find and read your annual water quality report
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 Aleutians West Census Area County, Alaska”, https://aquacensus.com/water-systems/alaska/aleutians-west-census-area (data as of October 1, 2026).