County · Washington
Lewis County, Washington: drinking water records
Explore EPA records for 51 community water systems across 21 ZIP codes in Lewis County, then find water-testing resources and available recent monitoring-station readings.
Data as of EPA UCMR 5 final release, August 2026 (file dated Aug 28, 2026) · EPA SDWIS 2026Q2 (file dated Jul 9, 2026). How we build these pages
Drinking-water records
EPA survey and compliance records are historical reports. UCMR 5 results are available for 2 of the 51 listed systems in this snapshot. A system with no reported PFAS detection is not a test of every tap or every contaminant.
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 in this county
All 51 active community systems in the available county records, sorted by record completeness. Scroll the table to explore more systems.
| 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 ppbbelow the action level |
| Chehalis Water Department WA5312250 | 11,718 | 105 | 0 | 0 | 0 ppbbelow the action level |
| Vader-Enchanted Valley WA5390900 | 985 | 0 | 0 | 2 | 1 ppbbelow the action level |
| Pe Ell Town of WA5366750 | 859 | 0 | 0 | 3 | 0 ppbbelow the action level |
| Lewis Co Water Sewer Dist #6 WA5344240 | 740 | 0 | 0 | 1 | 3.5 ppbbelow the action level |
| Salkum Water Supply WA5375550 | 103 | 0 | 0 | 1 | 0.6 ppbbelow the action level |
| Mayfield Kamper Klub WA5352112 | 87 | 0 | 0 | 1 | 3 ppbbelow the action level |
| Timberlane Mobile Home Park WA5388381 | 63 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Winlock City of WA5397500 | 3,502 | 0 | 0 | 0 | 2.4 ppbbelow the action level |
| Napavine City of WA5358200 | 3,095 | 0 | 0 | 0 | 3 ppbbelow the action level |
| Boistfort Valley WA5307610 | 2,389 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Morton City of WA5356250 | 2,147 | 0 | 0 | 0 | 2.4 ppbbelow the action level |
| Lewis Co Water Dist #2 WA5347001 | 1,983 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Toledo Municipal WA5388660 | 1,944 | 0 | 0 | 0 | 4 ppbbelow the action level |
| Mossyrock Public Utility City of WA5356350 | 1,553 | 0 | 0 | 0 | 2 ppbbelow the action level |
| High Valley Country Club WA5332700 | 1,425 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Lewis Co Water Dist #1 WA5347000 | 1,174 | 0 | 0 | 0 | 1.7 ppbbelow the action level |
| Lewis Co Water Dist #3 WA5365550 | 611 | 0 | 0 | 0 | 2.5 ppbbelow the action level |
| Newaukum Hill Water Assn WA5301428 | 493 | 0 | 0 | 0 | 1.9 ppbbelow the action level |
| Timberline Village 628 WA5388388 | 378 | 0 | 0 | 0 | 1.7 ppbbelow the action level |
| Paradise Estates Water Dept INC WA5366090 | 309 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Newaukum Ventures WA5326014 | 186 | 0 | 0 | 0 | 2.8 ppbbelow the action level |
| Mayfield RV Park WA5311154 | 165 | 0 | 0 | 0 | 1.5 ppbbelow the action level |
| Valley Meadows 240 WA5390981 | 148 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Middle Fork Water & Sewer WA5300315 | 144 | 0 | 0 | 0 | 0 ppbbelow the action level |
| View Ranch Estates Water Assn WA5301567 | 141 | 0 | 0 | 0 | 1.3 ppbbelow the action level |
| Parkwood Mobile Home Estates WA5366219 | 105 | 0 | 0 | 0 | 2.4 ppbbelow the action level |
| Redmon Mobile Home Park WA5371643 | 105 | 0 | 0 | 0 | 2.6 ppbbelow the action level |
| Lakeside Village WA5345303 | 94 | 0 | 0 | 0 | 3.6 ppbbelow the action level |
| Lake Mayfield Community Club WA5300914 | 88 | 0 | 0 | 0 | 2.7 ppbbelow the action level |
| Harmony Park Lot Owners WA5331362 | 81 | 0 | 0 | 0 | 6.7 ppbbelow the action level |
| Rom 626 WA5371930 | 74 | 0 | 0 | 0 | 3.2 ppbbelow the action level |
| Mountain Lakeview 619 WA5356736 | 70 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Frost Road Park WA5326647 | 65 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Gunderson Water Works WA5330235 | 53 | 0 | 0 | 0 | 2.5 ppbbelow the action level |
| Cowlitz Indian Tribal Housing WA5325244 | 52 | 0 | 0 | 0 | 0 ppbbelow the action level |
| River Oaks RV Park & Campground WA5313644 | 50 | 0 | 0 | 0 | 0.5 ppbbelow the action level |
| Winston Creek RV Park WA5358780 | 50 | 0 | 0 | 0 | 3.3 ppbbelow the action level |
| Cascade MHP WA5367310 | 48 | 0 | 0 | 0 | 4 ppbbelow the action level |
| Silverbrook Mh & RV WA5379190 | 42 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Sunsetvue WA5363921 | 42 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Lakeview Terrace WA5345365 | 41 | 0 | 0 | 0 | 2.9 ppbbelow the action level |
| Tilton River Mobile Home Park WA5356700 | 40 | 0 | 0 | 0 | 2.7 ppbbelow the action level |
| Skate Creek Terrace Association WA5379650 | 39 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Aust 210 WA5301222 | 35 | 0 | 0 | 0 | 0.7 ppbbelow the action level |
| Cedar Villa WA5311998 | 32 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Jackson Mobile 2 WA5303021 | 30 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Sandra Avenue 627 WA5354591 | 30 | 0 | 0 | 0 | 1.7 ppbbelow the action level |
| Sward 278 WA5306046 | 25 | 0 | 0 | 0 | 2.1 ppbbelow the action level |
| Winlock Waters 2 WA5307925 | 25 | 0 | 0 | 0 | 1.5 ppbbelow the action level |
| Meadows WA5304569 | 24 | 0 | 0 | 0 | not reported |
USGS · Monitoring stations
The water, more recently.
Available station readings in Lewis County, Washington. Each measurement keeps its time, unit and original source.
These readings describe water at a monitoring station. They do not test your tap, measure PFAS or lead, or determine whether water is safe to drink or swim in.
Recent observations load when this section comes into view.
How these readings update
We check for updates every 10 minutes while this section is visible and show supported observations from the last 48 hours. The time beside a reading is when USGS measured it; the checked time is when our service retrieved the response. We mark a reading more than 6 hours old as older. Provisional observations can change after USGS review. A missing reading does not mean zero or clean water.
Temperature, pH, dissolved oxygen, turbidity, conductivity, streamflow and water level are shown only where a station reports them. Different measurements have different units and sampling intervals. USGS data and documentation.
Your next step
Water testing, reports & local help.
Use these official directories to find your drinking-water agency, a certified laboratory and public water records. We have not yet added an individually reviewed local resource list for this county.
Official national directories
Water testing
Find your state’s private-well program
EPA’s state directory points well owners to local program information. Services and eligibility vary by state and county.
Water testing
Find a certified drinking-water laboratory
Use EPA’s directory to reach your state’s laboratory certification program. EPA does not provide on-request testing of residential drinking water.
Public records
Find your utility’s Consumer Confidence Report
EPA links to community water-system reports and explains how to read them. Look for your actual supplier rather than assuming every address in a county shares one system.
Public records
Explore USGS water observations
Find current and historical observations from USGS monitoring locations, including available stream, lake, and groundwater data. Measurements vary by station and do not replace a test of your household water.
A county overview cannot identify every property’s water provider. If you use a public water system, confirm its name on your bill and request its annual Consumer Confidence Report. Private wells need their own testing; public-system records do not describe a private well.
Understand water testing and laboratory reportsResource descriptions are compiled by Tap Water Lookup. Review dates describe our source check, not a new water sample. How we review sources · Suggest a correction
Explore your area
Local coverage in Lewis County
21ZIP areas in this overview
Explore the water-system records, recent station readings and testing resources on this county page. They describe the systems and stations identified in each section; they are not a separate water test for every community.
Towns and communities
- Centralia
- Chehalis
- Mineral
- Morton
- Mossyrock
- Napavine
- Onalaska
- Packwood
- Pe Ell
- Toledo
- Vader
- Winlock
View ZIP areas and understand coverage
- 98336
- 98355Mineral
- 98356Morton
- 98361Packwood
- 98377Packwood
- 98531Centralia
- 98532Chehalis
- 98533
- 98538
- 98539
- 98542
- 98544
- 98564Mossyrock
- 98565Napavine
- 98570Onalaska
- 98572Pe Ell
- 98582
- 98585
- 98591Toledo
- 98593Vader
- 98596Winlock
These Census ZIP Code Tabulation Areas are grouped here by their largest county overlap. A ZIP area can cross county lines and contain several water suppliers or private wells. Place labels reflect Census geography, not verified postal city names or utility service boundaries.
Records for these areas are currently presented in this county overview rather than individual ZIP reports. An unpublished report does not mean there are no water records. Confirm your supplier on your water bill; if you use a private well, testing your own well is the relevant next step.
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. Database prepared 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.
Compiled by Tap Water Lookup from the sources identified on this page. Read the methodology and review process.