Water quality in Cosmopolis, Washington
Cosmopolis is in Grays Harbor County. 87 active public water systems serve the county; 31 had an EPA violation in the past three years.
Most likely your provider
Your location is within the outer bounds of this system's EPA service area.
Other community water systems in Grays Harbor County
34 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Aberdeen City of |
22,867 | 1 | 3.1 mi | |
| Grays Harbor CO Water Dist 2 |
5,112 | 1 | 3.9 mi | |
| Monte View Estates |
200 | 1 | 5.6 mi | |
| Hoquiam Water Department |
11,456 | 0 | 6.1 mi | |
| Montesano City of |
6,204 | 0 | 8.5 mi | |
| Harbor Mobile Estates |
72 | 0 | 8.8 mi | |
| Illahee Oyehut |
971 | 0 | 10.2 mi | |
| Ocosta Mobile Home Park LLC |
26 | 4 | 14.0 mi | |
| Bay City Properties |
90 | 0 | 14.8 mi | |
| Westport Water Department |
5,346 | 1 | 16.3 mi | |
| Elma City of |
6,638 | 1 | 17.3 mi | |
| Ocean Shores Water Dept |
9,347 | 0 | 18.1 mi | |
| Grays Harbor CO Water Dist 1 |
1,302 | 0 | 18.1 mi | |
| Hogans Corner |
1,458 | 1 | 18.5 mi | |
| Greenwood Mobile Home Park |
350 | 2 | 19.0 mi | |
| Vikings West Mobile Home |
71 | 2 | 19.4 mi | |
| Ocean City |
237 | 1 | 20.2 mi | |
| Meadowood Development |
220 | 1 | 20.3 mi | |
| Malone |
181 | 0 | 21.1 mi | |
| Sea View |
170 | 2 | 21.1 mi | |
| Paradise Water Assoc |
74 | 0 | 21.5 mi | |
| Haven by the Sea |
308 | 1 | 21.6 mi | |
| Rls 1 |
38 | 0 | 21.7 mi | |
| Forestview Senior Community LLC |
92 | 0 | 23.2 mi | |
| Iron Springs Park |
62 | 0 | 24.0 mi |
Non-community systems in Grays Harbor County (52: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to Grays Harbor County, nearest to Cosmopolis first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility. Distances are measured to the centre of the service area EPA publishes for the system.
Town locations and ZIP code areas come from U.S. Census Bureau 2020 files.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Washington records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.