Wahkiakum County, Washington — public water systems
At a glance
6 active public water systems are filed under Wahkiakum County, Washington in EPA's SDWIS records, together reporting 3,726 people served. The largest is Cathlamet Water Dept, which reports serving 1,636 people. 4 are community water systems serving people where they live; the other 2 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
3.7K
Community systems
4
Groundwater share
66.7%
How does Wahkiakum County compare with other Washington counties?
Wahkiakum County has the 43rd-most active public water systems among the 72 counties listed for active Washington systems in EPA records; among the 44 with 3 or more systems, the median has 75. Its systems report 3,726 people served in total, the 38th-largest county figure in the state and less than 0.1% of the statewide total. The average system here reports serving 621 people, well below the Washington average of 2,172. 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 Wahkiakum County's drinking water come from?
By primary water source, Wahkiakum County's active systems draw on groundwater (4, 67%), surface water (1, 17%) and purchased surface water (1, 17%). Overall, 67% rely mainly on groundwater (including purchased groundwater) and 33% on surface water, compared with 94% and 5.7% across Washington. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, Cathlamet Water Dept, draws primarily on surface water.
What kinds of water systems operate in Wahkiakum County?
Wahkiakum County's active systems break down as 4 community systems (67%) and 2 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 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 local government (100%).
Water systems in Wahkiakum County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Cathlamet Water Dept | Wahkiakum | 1,636 | Community | Surface water |
| 2 | Puget Island | Wahkiakum | 920 | Community | Purchased surface water |
| 3 | Western Wahkiakum | Wahkiakum | 791 | Community | Groundwater |
| 4 | Skamokawa Water System | Wahkiakum | 267 | Community | Groundwater |
| 5 | Skamokawa Vista Park | Wahkiakum | 87 | Transient non-community | Groundwater |
| 6 | County Line Park | Wahkiakum | 25 | Transient non-community | Groundwater |
Wahkiakum County water systems: frequently asked questions
How many public water systems are in Wahkiakum County, Washington?
EPA's SDWIS records file 6 active public water systems under Wahkiakum County, Washington: 4 community systems (67%) and 2 transient non-community systems (33%).
Who supplies drinking water in Wahkiakum County, WA?
The largest community water systems filed under Wahkiakum County are Cathlamet Water Dept (1,636 people served), Puget Island (920 people served) and Western Wahkiakum (791 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 Wahkiakum County's drinking water come from groundwater or surface water?
Of the 6 active public water systems in Wahkiakum County, 67% draw mainly on groundwater and 33% on surface water, counting purchased supplies. The largest system, Cathlamet Water Dept, uses surface water.
Where can I find a water quality report for Wahkiakum 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 Wahkiakum 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 Wahkiakum 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 Washington 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 Wahkiakum County, Washington”, https://aquacensus.com/water-systems/washington/wahkiakum (data as of October 1, 2026).