Skip to content
AquaCensus

Grays Harbor County, Washington — public water systems

At a glance

88 active public water systems are filed under Grays Harbor County, Washington in EPA's SDWIS records, together reporting 89,150 people served. The largest is City of Aberdeen, which reports serving 22,867 people. 35 are community water systems serving people where they live; the other 53 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

88

Population served

89.2K

Community systems

35

Groundwater share

96.6%

How does Grays Harbor County compare with other Washington counties?

Grays Harbor County has the 19th-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 89,150 people served in total, the 18th-largest county figure in the state and 0.9% of the statewide total. The average system here reports serving 1,013 people, about half of 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 Grays Harbor County's drinking water come from?

By primary water source, Grays Harbor County's active systems draw on groundwater (83, 94%), surface water (2, 2.3%), purchased surface water (1, 1.1%) and groundwater under influence of surface water (1, 1.1%). Overall, 97% rely mainly on groundwater (including purchased groundwater) and 3.4% 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, City of Aberdeen, draws primarily on surface water.

What kinds of water systems operate in Grays Harbor County?

Grays Harbor County's active systems break down as 35 community systems (40%), 6 non-transient non-community systems (6.8%) and 47 transient non-community systems (53%). 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 (70%), local government (24%), federal government (3.4%) and state government (2.3%).

The 50 largest water systems in Grays Harbor County

🔒 Create a free account to export CSV
Active public water systems in Grays Harbor County, Washington
#Water systemCountyPopulation servedTypeSource
1Aberdeen City ofGrays Harbor22,867CommunitySurface water
2Hoquiam Water DepartmentGrays Harbor11,456CommunitySurface water
3Ocean Shores Water DeptGrays Harbor9,347CommunityGroundwater
4Elma City ofGrays Harbor6,638CommunityGroundwater
5Montesano City ofGrays Harbor6,204CommunityGroundwater
6Westport Water DepartmentGrays Harbor5,346CommunityGroundwater
7Grays Harbor Co Water Dist 2Grays Harbor5,112CommunityGroundwater
8Mccleary City ofGrays Harbor2,753CommunityGroundwater
9Pacific Beach/MoclipsGrays Harbor2,372CommunityGroundwater
10Cosmopolis Water DepartmentGrays Harbor1,812CommunityPurchased surface water
11Hogans CornerGrays Harbor1,458CommunityGroundwater
12Oakville City ofGrays Harbor1,325CommunityGroundwater
13Grays Harbor Co Water Dist 1Grays Harbor1,302CommunityGroundwater
14Elma Rest AreaGrays Harbor1,122Transient non-communityGroundwater
15Lake QuinaultGrays Harbor1,003CommunityGroundwater
16Illahee OyehutGrays Harbor971CommunityPurchased groundwater
17Ocean Breeze ResortGrays Harbor687Transient non-communityGroundwater
18Satsop Business ParkGrays Harbor544Non-transient non-communityGroundwater under influence of surface water
19Wynoochee Wildwood ParkGrays Harbor471Transient non-communityGroundwater
20Greenwood Mobile Home ParkGrays Harbor350CommunityGroundwater
21Ocean Shores Outdoor ClubGrays Harbor309Transient non-communityGroundwater
22Haven By the SeaGrays Harbor308CommunityGroundwater
23Griffith Priday State ParkGrays Harbor280Transient non-communityGroundwater
24Surfcrest Properties LLCGrays Harbor256Transient non-communityGroundwater
25Ocean CityGrays Harbor237CommunityGroundwater
26Neilton Meadowland Wd 8 AGrays Harbor222CommunityGroundwater
27Meadowood DevelopmentGrays Harbor220CommunityGroundwater
28Monte View EstatesGrays Harbor200CommunityGroundwater
29MaloneGrays Harbor181CommunityGroundwater
30Green Lantern PubGrays Harbor175Transient non-communityGroundwater
31Sea ViewGrays Harbor170CommunityGroundwater
32Coho CampgroundGrays Harbor152Transient non-communityGroundwater
33Country EstatesGrays Harbor150CommunityGroundwater
34Briggs NurseryGrays Harbor150Non-transient non-communityGroundwater
35Gold Beach AviationGrays Harbor134Transient non-communityGroundwater
36Iron Springs ResortGrays Harbor120Transient non-communityGroundwater
37Clarks RestaurantGrays Harbor109Transient non-communityGroundwater
38Humptulips GroceryGrays Harbor105Transient non-communityGroundwater
39Bay City SausageGrays Harbor104Transient non-communityGroundwater
40South ArborGrays Harbor101Transient non-communityGroundwater
41Humptulips Grange #730Grays Harbor100Transient non-communityGroundwater
42Ocean Spray CranberriesGrays Harbor100Non-transient non-communityGroundwater
43Forestview Senior Community LLCGrays Harbor92CommunityGroundwater
44Bay City PropertiesGrays Harbor90CommunityGroundwater
45Screamin Eagle CampgroundGrays Harbor86Transient non-communityGroundwater
46Vaughan PumpsGrays Harbor85Non-transient non-communityGroundwater
47Oceana Ii EastGrays Harbor80Transient non-communityGroundwater
48Murphy Elma VeneerGrays Harbor80Non-transient non-communityGroundwater
49Paradise Water AssocGrays Harbor74CommunityGroundwater
50Harbor Mobile EstatesGrays Harbor72CommunityGroundwater

All other water systems in Grays Harbor County (38)

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

Grays Harbor County water systems: frequently asked questions

How many public water systems are in Grays Harbor County, Washington?

EPA's SDWIS records file 88 active public water systems under Grays Harbor County, Washington: 35 community systems (40%), 6 non-transient non-community systems (6.8%) and 47 transient non-community systems (53%).

Who supplies drinking water in Grays Harbor County, WA?

The largest community water systems filed under Grays Harbor County are City of Aberdeen (22,867 people served), Hoquiam Water Department (11,456 people served) and Ocean Shores Water Dept (9,347 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 Grays Harbor County's drinking water come from groundwater or surface water?

Of the 88 active public water systems in Grays Harbor County, 97% draw mainly on groundwater and 3.4% on surface water, counting purchased supplies. The largest system, City of Aberdeen, uses surface water.

Where can I find a water quality report for Grays Harbor 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. 35 community systems are filed under Grays Harbor 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 Grays Harbor 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 Grays Harbor County, Washington”, https://aquacensus.com/water-systems/washington/grays-harbor (data as of October 1, 2026).