PlainWater
Counties → Washington

Lewis County, Washington

SDWIS compliance plate

Sheet WA041 · Lewis County 166 sys · 15,450 viol · #631/3254

VIOL-SEVERE · HEALTH-LOW · RANK-TOP · PHOTO-FINISH · PFAS-HIGH · SRC-GW · SYS-LARGE · BOOK-FULL

  • VIOL-SEVERE 89.8% flagged
  • HEALTH-LOW 3.1% health
  • RANK-TOP #631/3254
  • PHOTO-FINISH ±0.3 pp
  • PFAS-HIGH 50.0% detect
  • SRC-GW GW lead 95%
  • SYS-LARGE 166 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Kittitas County ( -0.3 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Lewis County ranks #631 of 3,254 counties by people served, and #18 of 39 counties in Washington. See methodology · corpus placement.

Lewis County standing, lower-flagged corpus third

Flagged-system rate 89.8% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 3.1% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 50.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #631 of 3,254 · #18 of 39 in Washington.

Flagged-rate neighbourhood around Lewis County

Lowest/highest poles plus in-state counties nearest Lewis County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.

0% 20% 40% 60% 80% 100% Grant · lowest Kittitas · near Cowlitz · near Wahkiakum · highest 69.8% 88.9% 89.4% 89.8% 90.8% 91.2% 100%

Source: EPA SDWIS (county aggregates) As of 2026-05-15

Water Systems

System Name Population Violations PFAS
Centralia Public Works - Water 28,164 10 Detected
Chehalis Water Department 11,426 42 Clean
Winlock City Of 3,502 237 -
Napavine City Of 3,095 57 -
Boistfort Valley 2,389 388 -
Morton City Of 2,147 52 -
White Pass Company Inc 2,066 128 -
Lewis Co Water Dist #2 1,983 2,344 -
Toledo Municipal 1,944 22 -
Hamilton AL 1,807 1,553 -
Ike Kinswa State Park 1,680 21 -
Mossyrock Public Utility City Of 1,553 52 -
High Valley Country Club 1,425 87 -
Western Forest Industries Museum 1,266 3 -
Lewis Co Water Dist #1 1,174 400 -
Vader-Enchanted Valley 985 57 -
Eagle Plaza Truck Stop 962 46 -
Miller 935 40 -
Pe Ell Town Of 859 434 -
Mossyrock Park Power House 832 16 -
Lewis Co Water Sewer Dist #6 740 33 -
Gee Cee S Truckstop 646 80 -
Lewis Co Water Dist #3 611 24 -
Lewis & Clark State Park 595 27 -
Newaukum Hill Water Assn 493 38 -
Chehalis Livestock Auction & Cafe 457 11 -
Bevin Lake Rest Area 443 9 -
Cispus Environmental Center 423 16 -
Paradise 414 20 -
Taidnapam Park 410 13 -
Marys Corner Market 409 29 -
Mustard Seed 405 28 -
Iron Creek 401 3 -
La Wis Wis Campground 401 7 -
Winlock High School 400 32 -
Timberline Village 628 378 10 -
Hillcrest Food Mart 360 18 -
Ritchie Brothers 328 0 -
Rainbow Falls State Park 321 31 -
Huff and Puff Drive IN 313 26 -
Cowlitz Food and Fuel 312 7 -
Paradise Estates Water Dept Inc 309 214 -
South Lewis County Regional Park 303 8 -
Schaefer County Park 301 21 -
Dashmesh Petroleum 284 49 -
Perry 277 56 -
Peking House 210 15 -
St Francis Xavier Mission 206 0 -
Blue Earth Farms 204 2 -
Transalta Centralia Generation 200 14 -

Compare beyond Washington

Lower-flagged peers for Lewis County

Cross-state counties nearest Lewis County on flagged-system share (89.8%) and cumulative violation count (15,450). In-state neighbours stay on the compliance plate above.

Similar flagged-system rate

Nearest cross-state counties by % of SDWIS systems with at least one violation on record.

4 peers

Similar violation load

Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).

4 peers

Read our methodology · Check your water system - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.