Water quality in Castle Rock, Washington
Castle Rock is in Cowlitz County. 77 active public water systems serve the county; 23 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 Cowlitz County
30 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Camelot Subdivision |
142 | 1 | 1.0 mi | |
| Beacon Hill Water & Sewer District |
11,969 | 0 | 5.9 mi | |
| Pleasant Hill Terrace Subdivision |
30 | 0 | 7.1 mi | |
| Toutle Community Regional Water |
3,215 | 2 | 7.5 mi | |
| Beacon Hill East |
190 | 0 | 7.5 mi | |
| Longview Water Department |
57,617 | 1 | 8.8 mi | |
| Toutle River View |
45 | 1 | 9.2 mi | |
| Kelso City of |
15,775 | 0 | 9.9 mi | |
| Ryderwood Improvement & Service AS |
434 | 1 | 9.9 mi | |
| Sandwood Heights Subdivision |
126 | 0 | 10.6 mi | |
| Owl Creek |
102 | 0 | 12.4 mi | |
| Carrolls Water Assn |
449 | 0 | 13.5 mi | |
| Paradise Cove Resort & RV Park |
59 | 0 | 15.9 mi | |
| Kalama City of |
8,020 | 0 | 18.6 mi | |
| Davis Terrace Water Assn |
222 | 2 | 18.8 mi | |
| Viking Village Mobile Home Park |
25 | 0 | 20.6 mi | |
| High Ridge |
73 | 0 | 23.5 mi | |
| Peterson Farms |
290 | 0 | 24.7 mi | |
| Columbia Riverfront RV Park |
233 | 1 | 25.3 mi | |
| Lewis River RV Park |
347 | 0 | 25.6 mi | |
| Woodland City of |
10,640 | 0 | 25.8 mi | |
| Lewis River Golf Course |
300 | 0 | 25.9 mi | |
| Merwin Village/park Ppl CO |
92 | 0 | 27.3 mi | |
| Tulip Meadows |
33 | 2 | 28.9 mi | |
| Cougar Crest |
290 | 0 | 32.4 mi |
Non-community systems in Cowlitz County (46: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to Cowlitz County, nearest to Castle Rock 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.