County · Washington
Lewis County, Washington: drinking water records
This overview covers 21 ZIP codes and 51 community water systems in Lewis County. It also stands in for 4 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 |
|---|---|---|---|---|---|
| Centralia Public Works - Water WA5312200 | 28,164 | 180 | 2 | 0 | 0 ppb |
| Chehalis Water Department WA5312250 | 11,718 | 105 | 0 | 0 | 0 ppb |
| Vader-Enchanted Valley WA5390900 | 985 | 0 | 0 | 2 | 1 ppb |
| Pe Ell Town of WA5366750 | 859 | 0 | 0 | 3 | 0 ppb |
| Lewis Co Water Sewer Dist #6 WA5344240 | 740 | 0 | 0 | 1 | 3.5 ppb |
| Salkum Water Supply WA5375550 | 103 | 0 | 0 | 1 | 0.6 ppb |
| Mayfield Kamper Klub WA5352112 | 87 | 0 | 0 | 1 | 3 ppb |
| Timberlane Mobile Home Park WA5388381 | 63 | 0 | 0 | 1 | 0 ppb |
| Winlock City of WA5397500 | 3,502 | 0 | 0 | 0 | 2.4 ppb |
| Napavine City of WA5358200 | 3,095 | 0 | 0 | 0 | 3 ppb |
| Boistfort Valley WA5307610 | 2,389 | 0 | 0 | 0 | 0 ppb |
| Morton City of WA5356250 | 2,147 | 0 | 0 | 0 | 2.4 ppb |
| Lewis Co Water Dist #2 WA5347001 | 1,983 | 0 | 0 | 0 | 0 ppb |
| Toledo Municipal WA5388660 | 1,944 | 0 | 0 | 0 | 4 ppb |
| Mossyrock Public Utility City of WA5356350 | 1,553 | 0 | 0 | 0 | 2 ppb |
| High Valley Country Club WA5332700 | 1,425 | 0 | 0 | 0 | 2 ppb |
| Lewis Co Water Dist #1 WA5347000 | 1,174 | 0 | 0 | 0 | 1.7 ppb |
| Lewis Co Water Dist #3 WA5365550 | 611 | 0 | 0 | 0 | 2.5 ppb |
| Newaukum Hill Water Assn WA5301428 | 493 | 0 | 0 | 0 | 1.9 ppb |
| Timberline Village 628 WA5388388 | 378 | 0 | 0 | 0 | 1.7 ppb |
| Paradise Estates Water Dept INC WA5366090 | 309 | 0 | 0 | 0 | 0 ppb |
| Newaukum Ventures WA5326014 | 186 | 0 | 0 | 0 | 2.8 ppb |
| Mayfield RV Park WA5311154 | 165 | 0 | 0 | 0 | 1.5 ppb |
| Valley Meadows 240 WA5390981 | 148 | 0 | 0 | 0 | 2 ppb |
| Middle Fork Water & Sewer WA5300315 | 144 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Lewis County
No ZIP report in this county is published yet.
These ZIP codes are covered by this overview because their utility has too little EPA data for a separate page: 98355, 98539, 98542, 98544.
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.