County · Washington
Cowlitz County, Washington: drinking water records
This overview covers 10 ZIP codes and 31 community water systems in Cowlitz County. It also stands in for 0 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Longview Water Department WA5348100 | 57,617 | 60 | 0 | 0 | 0 ppb |
| Kelso City of WA5338000 | 15,775 | 120 | 0 | 0 | 1 ppb |
| Beacon Hill Water & Sewer District WA5315650 | 11,969 | 60 | 0 | 0 | 0 ppb |
| Woodland City of WA5398200 | 10,640 | 120 | 1 | 0 | 2.1 ppb |
| Kalama City of WA5337550 | 8,020 | 120 | 0 | 0 | 1 ppb |
| Castle Rock Municipal Water WA5311800 | 4,367 | 360 | 0 | 0 | 5 ppb |
| Carrolls Water Assn WA5311300 | 449 | 0 | 0 | 3 | 1.3 ppb |
| Kelley Crest WA5329441 | 45 | 0 | 0 | 1 | 4 ppb |
| Hazel Dell Mobile Park WA5331975 | 24 | 0 | 0 | 1 | 16.5 ppb |
| Toutle Community Regional Water WA5388905 | 3,215 | 0 | 0 | 0 | 2 ppb |
| Ryderwood Improvement & Service As WA5375100 | 434 | 0 | 0 | 0 | 0.5 ppb |
| Lewis River RV Park WA5329521 | 347 | 0 | 0 | 0 | 2.7 ppb |
| Lewis River Golf Course WA5337105 | 300 | 0 | 0 | 0 | 2.1 ppb |
| Cougar Crest WA5315130 | 290 | 0 | 0 | 0 | 1.6 ppb |
| Peterson Farms WA5301484 | 290 | 0 | 0 | 0 | 0 ppb |
| Columbia Riverfront RV Park WA5300946 | 233 | 0 | 0 | 0 | 10.6 ppb |
| Davis Terrace Water Assn WA5318150 | 222 | 0 | 0 | 0 | 0 ppb |
| Beacon Hill East WA53AD882 | 190 | 0 | 0 | 0 | 1 ppb |
| Camelot Subdivision WA5310805 | 142 | 0 | 0 | 0 | 1.5 ppb |
| Sandwood Heights Subdivision WA5375893 | 126 | 0 | 0 | 0 | 3.8 ppb |
| Owl Creek WA5303943 | 102 | 0 | 0 | 0 | 1.1 ppb |
| Mulkey Meadows 1 WA5302519 | 93 | 0 | 0 | 0 | 0 ppb |
| Merwin Village/Park Ppl Co WA5354061 | 92 | 0 | 0 | 0 | 0 ppb |
| High Ridge WA53AB327 | 73 | 0 | 0 | 0 | 0 ppb |
| Edgewater Mobile Estates WA5322421 | 70 | 0 | 0 | 0 | 0.6 ppb |
ZIP reports in Cowlitz County
No ZIP report in this county is published yet.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.