Lewis, WA
A PlainEnviro-computed score from reported facility/violation counts, not an official EPA rating, health forecast, or population-adjusted rate. See methodology.
Environmental data for Lewis in Washington · Population: 83,925
Lewis, WA is tracked across three EPA datasets covering 9 Toxics Release Inventory (TRI) facilities, 55 Safe Drinking Water Act systems, and 0 Superfund National Priorities List sites. Together these generate an environmental burden score of 40/100 (Moderate Risk), calibrated against national distributions for facility density, chemical release volume, Superfund concentration, and water-system health violations.
Industrial disclosures inside the county total 724.2K lbs of reported toxic releases under EPCRA Section 313, while 8 water systems carry an active health-based violation in the SDWIS record. EPA Air Quality System monitors logged a median AQI of 22 and a peak AQI of 129 in 2024, with 93% of observed days rated "Good" (0–50).
All figures below draw directly from federal EPA records, TRI self-reported emissions, SDWIS compliance history, NPL Hazard Ranking System scores, and AQS daily AQI summaries, and are not adjusted, weighted, or forecast. A past violation or elevated score does not itself indicate current unsafe conditions; it documents the regulatory and disclosure history publicly filed with the U.S. Environmental Protection Agency through the most recent reporting cycle.
Air Quality History (2020–2024)
EPA Air Quality Index (AQI) data showing how many days per year fall into each air quality category.
| Year | Good | Moderate | Unhealthy (SG) | Max AQI |
|---|---|---|---|---|
| 2024 | 336 (93%) | 23 | 1 | 129 |
| 2023 | 314 (87%) | 46 | 1 | 159 |
| 2022 | 285 (78%) | 70 | 7 | 198 |
| 2021 | 328 (94%) | 22 | 0 | 71 |
| 2020 | 314 (94%) | 20 | 0 | 258 |
Source: EPA Air Quality System (AQS) Annual AQI by County EPA Air Quality System (AQS) Annual AQI by County AQI categories: Good (0-50), Moderate (51-100), Unhealthy for Sensitive Groups (101-150), Unhealthy (151-200), Very Unhealthy (201-300), Hazardous (301+)
For real-time air quality readings and pollutant breakdowns in Washington, see the EPA's AirNow.gov.
Water Systems (55)
| System | Population | Violations |
|---|---|---|
| CENTRALIA PUBLIC WORKS - WATER | 28,164 | 0 |
| CHEHALIS WATER DEPARTMENT | 11,426 | 0 |
| WINLOCK CITY OF | 3,502 | 0 |
| NAPAVINE CITY OF | 3,095 | 0 |
| MORTON CITY OF | 2,147 | 0 |
| LEWIS CO WATER DIST #2 | 1,983 | 0 |
| TOLEDO MUNICIPAL | 1,944 | 0 |
| MOSSYROCK PUBLIC UTILITY CITY OF | 1,553 | 0 |
| HIGH VALLEY COUNTRY CLUB | 1,425 | 0 |
| LEWIS CO WATER DIST #1 | 1,174 | 0 |
| VADER-ENCHANTED VALLEY | 985 | 4 |
| PE ELL TOWN OF | 859 | 8 |
| Lewis Co Water Sewer Dist #6 | 740 | 1 |
| LEWIS CO WATER DIST #3 | 611 | 0 |
| NEWAUKUM HILL WATER ASSN | 493 | 0 |
| Maple Lane Behavioral Health | 450 | 0 |
| CARROLLS WATER ASSN | 449 | 6 |
| PLEASANT FOREST CAMPING CLUB | 327 | 0 |
| NEWAUKUM VENTURES | 186 | 0 |
| MALONE | 181 | 0 |
| FLYING CARPET MOBILE ESTATES | 174 | 0 |
| MIDDLE FORK WATER & SEWER | 144 | 0 |
| VIEW RANCH ESTATES WATER ASSN | 141 | 0 |
| WHISPERING WOODS HOME PARK | 125 | 0 |
| TIMBERLANE MOBILE ESTATES | 120 | 0 |
| PARKWOOD MOBILE HOME ESTATES | 105 | 0 |
| REDMON MOBILE HOME PARK | 105 | 0 |
| SALKUM WATER SUPPLY | 103 | 1 |
| LAKESIDE VILLAGE | 94 | 0 |
| SKOOKUMCHUCK MOBILE MANOR | 90 | 0 |
| LAKE MAYFIELD COMMUNITY CLUB | 88 | 0 |
| MAYFIELD KAMPER KLUB | 87 | 2 |
| HARMONY PARK LOT OWNERS | 81 | 0 |
| PATTERSON LAKE WATER | 79 | 0 |
| FROST ROAD PARK | 65 | 0 |
| TIMBERLANE MOBILE HOME PARK | 63 | 2 |
| WAYSIDE VILLAGE | 60 | 0 |
| Elbe Water & Sewer District | 60 | 0 |
| TOWNSHIP PLACE | 56 | 0 |
| PRAIRIE VILLAGE LLC | 55 | 0 |
| GUNDERSON WATER WORKS | 53 | 0 |
| Cowlitz Indian Tribal Housing | 52 | 0 |
| RIVER OAKS RV PARK & CAMPGROUND | 50 | 0 |
| WINSTON CREEK RV PARK | 50 | 0 |
| COLUMBIA CREST ESTATES | 48 | 44 |
| CASCADE MHP | 48 | 0 |
| SILVERBROOK MH & RV | 42 | 0 |
| LAKEVIEW TERRACE | 41 | 0 |
| TILTON RIVER MOBILE HOME PARK | 40 | 0 |
| SKATE CREEK TERRACE ASSOCIATION | 39 | 0 |
| GRAND MOUND MOTEL | 36 | 0 |
| CEDAR VILLA | 32 | 0 |
| JACKSON MOBILE 2 | 30 | 0 |
| WINLOCK WATERS 2 | 25 | 0 |
| MEADOWS | 24 | 0 |
TRI Facilities (9)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Transalta Centralia Generation / Mining | 590.9K lbs |
| 2 | Darigold - Chehalis | 95.1K lbs |
| 3 | Sierra Pacific Industries- Centralia | 35.2K lbs |
| 4 | Imperial Group Manufacturing | 2.2K lbs |
| 5 | National Frozen Foods Corp-Processing | 770 lbs |
| 6 | Glacier Northwest Inc Chehalis Plant | 11 lbs |
| 7 | Truck Accessories Group LLC DBA Pace Edwards | 2 lbs |
| 8 | Aladdin Manufacturing Carpet Cushion - Chehalis Wa | 0 lbs |
| 9 | Perdue Foods LLC - Chehalis Feedmill | 0 lbs |
Cities in Lewis (2)
Frequently Asked Questions
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What does this county environmental profile show?
This county environmental profile rolls up EPA Toxics Release Inventory facility reports, Safe Drinking Water Information System public-water-system filings, and Superfund National Priorities List sites for the county boundary defined by the U.S. Census Bureau. Facility counts reflect facilities with a reporting address inside the county, not where downstream environmental effects may be observed. Population figures are from the most recent Census ACS 5-year estimate. The county detail page is updated whenever the upstream EPA programs publish revised data; see the methodology page for the documented ingest cadence and the editorial choices governing how aggregations are computed.
Read our methodology - how this data is sourced, computed, and verified.