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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
WEST POINT WWTPHW:386081,381,812 population served2012
King County South Treatment PlantHW:38607787,449 population served2012
Brightwater Treatment PlantHW:38609596,885 population served2012
Spokane Riverside Park POTWHW:38659361,098 population served2012
TACOMA CENTRAL STP 1HW:38665218,383 population served2012
Everett WWTPHW:38576149,264 population served2012
CHAMBERS CREEKHW:38635134,089 population served2012
Alderwood Water and Wastewater DistHW:38537131,138 population served2012
Yakima Regional POTWHW:38682105,141 population served2012
Westside Treatment FacilityHW:3867296,426 population served2012
BELLINGHAM POST POINT TPHW:3854090,453 population served2012
SALMON CREEK STPHW:3855689,997 population served2012
KENNEWICK POTWHW:3858774,665 population served2012
EDMONDS STPHW:3857273,790 population served2012
LOTT Budd Inlet Treatment PlantHW:3862162,444 population served2012
PASCO STPHW:3863261,193 population served2012
MARYSVILLE LAGOONHW:3860560,660 population served2012
TACOMA 3 STP NORTHHW:3866655,050 population served2012
LAKOTA STPHW:3859550,050 population served2012
Marine Park WWTFHW:3867349,674 population served2012
RICHLAND STPHW:3864649,090 population served2012
Bremerton West Plant STPHW:3854448,057 population served2012
PULLMAN STPHW:3864246,820 population served2012
CENT KITSAP REG STPHW:3858844,476 population served2012
MIDWAY SEWER DISTRICT WWTPHW:3856843,616 population served2012
Cowlitz Water Pollution Control PlaHW:3859939,877 population served2012
PUYALLUP STPHW:3864337,240 population served2012
LYNNWOOD TREATMENT SYSTEMHW:3860235,860 population served2012
REDONDO STPHW:3859635,420 population served2012
WENATCHEE POTWHW:3867732,090 population served2012
MOUNT VERNON TREATMENTHW:3861531,940 population served2012
WALLA WALLA STPHW:3867431,670 population served2012
MILLER CREEK STPHW:3865631,104 population served2012
LAKE STEVENS STPHW:3859728,210 population served2012
Big Gulch WWTPHW:3862327,656 population served2012
SALMON CREEK STP 1HW:3865727,126 population served2012
SUMNER STPHW:3866426,950 population served2012
OAK HARBOR STPHW:3861924,200 population served2012
ABERDEEN STPHW:3853623,515 population served2012
Camas Wastewater Treatment PlantHW:3854719,620 population served2012
PORT ANGELES WWTPHW:3863919,080 population served2012
Hawks Prairie Recl Water SatelliteHW:3878218,779 population served2012
ELLENSBURG STPHW:3857318,250 population served2012
ARLINGTON TREATMENTHW:3868617,930 population served2012
ANACORTES STPHW:3853817,644 population served2012
MONROE STPHW:3861017,330 population served2012
CENTRALIA STPHW:3855017,140 population served2012
Sand Dunes WWTPHW:3861316,836 population served2012
WEST LONGVIEW WWTPHW:3860016,629 population served2012
SUNNYSIDE POTWHW:3875016,010 population served2012
GIG HARBOR STPHW:3863714,947 population served2012
WASHOUGAL S_T FACILITYHW:3867614,210 population served2012
EAST WENATCHEE STPHW:3857013,220 population served2012
WEST RICHLAND SEW TRT FACHW:3867912,200 population served2012
LYNDEN STPHW:3860112,060 population served2012
FERNDALE STPHW:3857711,530 population served2012
Port Orchard WWTPHW:3864011,440 population served2012
Snoqualmie WWTPHW:3865410,950 population served2012
ENUMCLAW WWTPHW:3857510,920 population served2012
GRANDVIEW STPHW:3858110,920 population served2012
MOSES LAKE STPHW:3861410,820 population served2012
CHENEY S_T FACILITYHW:3869310,790 population served2012
OCEAN SHORES STPHW:3873410,615 population served2012
SHELTON STPHW:386519,870 population served2012
CHEHALIS STPHW:385519,591 population served2012
LIBERTY LAKE STPHW:387679,255 population served2012
Snohomish Wastewater SystemHW:386529,200 population served2012
PORT TOWNSEND STPHW:386419,180 population served2012
BURLINGTON TREATMENTHW:385469,074 population served2012
COLLEGE PLACE WWTPHW:385598,780 population served2012
HOQUIAM WASTEWATER TREATMENT PLANTHW:385858,650 population served2012
ILWACO WASTEWATER TREATMENT PLANTHW:385868,127 population served2012
Whidbey NavalAir Station Oak HarborHW:386207,500 population served2012
SEDRO WOOLLEY TREATMENTHW:386497,473 population served2012
OTHELLO SEWAGE LAGOONSHW:386297,420 population served2012
CLARKSTON STPHW:385577,200 population served2012
Yelm Wastewater Treat and ReclaimHW:387637,005 population served2012
EPHRATA S_T FACILITYHW:387066,890 population served2012
TOPPENISH TREATMENTHW:386706,888 population served2012
MEDICAL LAKE STPHW:386066,860 population served2012
ORTING S_T FACILITYHW:386286,770 population served2012
Duvall WWTPHW:385696,715 population served2012
SEQUIM STPHW:386506,625 population served2012
WAPATO STPHW:386756,375 population served2012
Airway Heights WWTPHW:387806,220 population served2012
NORTH BEND TREATMENT PLANTHW:386185,830 population served2012
PROSSER WWTPHW:387385,780 population served2012
Woodland Wastewater Treatment PlantHW:386815,550 population served2012
BIRCH BAY STPHW:387705,500 population served2012
STANWOOD S_T FACILITYHW:386605,445 population served2012
RIDGEFIELD WWTPHW:386475,175 population served2012
CONNELL STPHW:385615,150 population served2012
COLVILLE SEW LAGOONHW:386955,116 population served2012
SELAH S_T FACILITYHW:387465,113 population served2012
OMAK STPHW:386264,728 population served2012
BLAINE STPHW:385414,705 population served2012
SULTAN SEWER SYSTEMHW:386534,655 population served2012
Buckley WWTFHW:385454,345 population served2012
North Bay WWTPHW:387834,175 population served2012
CLE ELUM S_T FACILITYHW:386944,168 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.