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World wastewater treatment plant observatory · data as reported by each inventory

Wastewater treatment plants in United States · Washington

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244 inventory records · HydroWASTE v1.0 / United States

Data years: 2012. The inventory date does not establish current operation.

244 results

CompareNameNative sizeYear
PENN COVE SD STPHW:38774577 population served2012
Coulee City STPHW:38697565 population served2012
LIND S_T FACILITYHW:38719560 population served2012
TOLEDO STPHW:38668540 population served2012
King County Vashon WWTPHW:38755539 population served2012
SEKIU STPHW:38555538 population served2012
MOSSYROCK S_T FACILITYHW:38731533 population served2012
KLICKITAT STPHW:38769525 population served2012
CONCONULLY S_T FACHW:38696524 population served2012
ST JOHN S_T FACILITYHW:38745523 population served2012
HARRAH S_T FACILITYHW:38710512 population served2012
WINTHROP S_T FACILITYHW:38762510 population served2012
SOUTH PRAIRIE AREAHW:38636482 population served2012
WILKESON STPHW:38680475 population served2012
OAKESDALE S_T FACILITYHW:38733450 population served2012
ROCKFORD S_T FACILITYHW:38742447 population served2012
MESA S_T FACILITYHW:38728440 population served2012
HARRINGTON S_T FACHW:38711420 population served2012
Colton STPHW:38778395 population served2012
Carlyon Beach WWTPHW:38622385 population served2012
STEVENS PASS SEWER DISTRIHW:38662384 population served2012
RYDERWOOD STPHW:38564380 population served2012
Woodbrook Sewage Treatment PlantHW:38566364 population served2012
Cusick Wastewater Treatment PlantHW:38700360 population served2012
ENDICOTT S_T FACILITYHW:38704360 population served2012
MANSFIELD S_T FACHW:38722325 population served2012
LaCrosse Wastewater FacilityHW:38717315 population served2012
LEWIS CO STP 2HW:38768311 population served2012
Naselle Youth Camp STFHW:38630300 population served2012
SPANGLE S_T FACILITYHW:38658297 population served2012
TAMOSHAN WWTPHW:38625292 population served2012
VANTAGE TREATMENTHW:38715292 population served2012
METALINE FALLS S_T FACHW:38730238 population served2012
Creston Wastewater Treatment PlantHW:38699235 population served2012
IONE LAGOONHW:38633215 population served2012
BUENA WWTFHW:38683210 population served2012
WASHTUCNA S_T FACILITYHW:38757205 population served2012
WISHRAM SEWER SYSTEMHW:38591184 population served2012
ELBE STPHW:38703176 population served2012
METALINE MUNICIPAL STPHW:38729160 population served2012
RUSTLEWOOD DEV STPHW:38723126 population served2012
FARMINGTON S_T FACHW:38708123 population served2012
ROOSEVELT LAGOONHW:3877150 population served2012
Port of Sunnyside Industrial WWTFHW:3877917 population served2012

Regulatory context

General reference. This is not an exhaustive review of applicable law.

United States: Clean Water Act / NPDES

NPDES regulates pollutant discharges from point sources to waters of the United States. The permit sets limits and monitoring conditions. A CWNS code identifies an inventory record, not an NPDES permit.

  • Permit identifier and permitting authority: EPA or an authorized state.
  • Outfall and receiving water; sewer connections follow a different control route.
  • Current permit conditions, limits and dated measurements; these are not included in CWNS.

References reviewed: 2026-11-06. Individual applicability: undetermined. This profile does not establish authorization or compliance.