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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
EVERSON S_T FACILITYHW:387073,837 population served2012
QUINCY INDUSTRIAL STPHW:386453,738 population served2012
DEER PARK POTWHW:387023,675 population served2012
RAYMOND STPHW:387393,664 population served2012
Chelan City of POTWHW:386923,627 population served2012
ELMA STPHW:385743,540 population served2012
SUQUAMISH STPHW:387513,510 population served2012
Long Beach WWTPHW:387203,475 population served2012
GOLDENDALE POTWHW:385793,425 population served2012
GRANITE FALLS STPHW:385833,370 population served2012
GRANGER POTWHW:385823,270 population served2012
MONTESANO WWPCPHW:386113,232 population served2012
BENTON CITY S_T FACHW:386873,145 population served2012
FORKS TREAT STPHW:385533,120 population served2012
CASHMERE STP FACILITYHW:386913,075 population served2012
DAYTON STPHW:385673,068 population served2012
NEWPORT STPHW:386173,040 population served2012
LUMMI TRIBE STPHW:387213,022 population served2012
ZILLAH TREATMENTHW:386843,000 population served2012
BINGEN POTWHW:386882,955 population served2012
LA CENTER STPHW:385932,935 population served2012
QUINCY DOMESTIC STPHW:386442,864 population served2012
COLFAX STPHW:385582,845 population served2012
EATONVILLE STPHW:385712,775 population served2012
WARDEN DOMESTIC STPHW:387562,690 population served2012
FRIDAY HARBOR STPHW:385782,680 population served2012
CHEWELAH S_T FACILITYHW:385522,610 population served2012
OKANOGAN S_T FACHW:387352,585 population served2012
OROVILLE S_T FACILITYHW:386272,570 population served2012
Kalama Wastewater Treatment PlantHW:387122,515 population served2012
BRIDGEPORT WWTPHW:386902,405 population served2012
WINSLOW TREATMENTHW:387612,385 population served2012
MANCHESTER STPHW:387722,310 population served2012
Mabton POTWHW:386042,290 population served2012
BREWSTER STPHW:386892,262 population served2012
Grand Mound WWTPHW:387262,232 population served2012
COUPEVILLE STPHW:385622,155 population served2012
COULEE DAM S_T FACHW:386982,138 population served2012
Castle Rock WWTPHW:385652,130 population served2012
Fisherman Bay STPHW:387662,076 population served2012
City of WESTPORT WW Treatment_SewerHW:386782,022 population served2012
SNOQUALMIE PASS UD TREATMENTHW:387141,985 population served2012
MCCLEARY STPHW:386031,981 population served2012
Leavenworth City of POTWHW:387181,970 population served2012
PACIFIC BEACH STPHW:385841,950 population served2012
GRAND COULEE STPHW:385801,884 population served2012
KINGSTON STPHW:387131,871 population served2012
Skagit Co SD2 Big Lake WWTPHW:387471,835 population served2012
ROYAL CITY S_T FACHW:387441,815 population served2012
Belfair Wastewater and Water ReclaimHW:387751,791 population served2012
CARNATION TREATMENTHW:385491,780 population served2012
DAVENPORT LAGOONHW:387011,780 population served2012
SOAP LAKE STPHW:386551,735 population served2012
RITZVILLE STPHW:386481,705 population served2012
Tenino Wastewater FacilityHW:387811,700 population served2012
DIAMOND LAKE STPHW:386341,698 population served2012
ENTIAT S_T FACILITYHW:387051,635 population served2012
SOUTH BEND STP CSHW:387481,635 population served2012
DALLESPORT TREATMENTHW:385901,625 population served2012
TULALIP BAY STPHW:387531,561 population served2012
STEVENSON STPHW:386611,500 population served2012
EASTSOUND WD STPHW:387651,500 population served2012
KITTITAS STPHW:385891,430 population served2012
POMEROY WWTPHW:386381,425 population served2012
WINLOCK S_T FACILITYHW:387601,340 population served2012
ASOTIN MUNICIPAL STPHW:385391,255 population served2012
REPUBLIC S_T FACILITYHW:387411,220 population served2012
WATERVILLE S_T FACILITYHW:387581,140 population served2012
MORTON STPHW:386121,125 population served2012
LA CONNER TREATMENTHW:387161,115 population served2012
TOUTLE STPHW:385631,103 population served2012
LANGLEY S_T FACILITYHW:385981,045 population served2012
TONASKET S_T FACILITYHW:386691,025 population served2012
Peshastin POTWHW:387771,016 population served2012
PALOUSE TREATMENT FACILITHW:386311,015 population served2012
LA PUSH SEWAGE TRT PLANTHW:385941,000 population served2012
COWICHE STPHW:38764996 population served2012
NORTH BONNEVILLE S_T FACHW:38732965 population served2012
TWISP S_T FACILITYHW:38671925 population served2012
Wilbur Wastewater Treatment PlantHW:38759885 population served2012
HARTSTENE POINTE STPHW:38776860 population served2012
TEKOA S_T FACILITYHW:38667820 population served2012
GLENWOOD STP and COLLECTIONHW:38592808 population served2012
CLALLAM BAY STPHW:38554780 population served2012
TAHOLAH STPHW:38752755 population served2012
Kitsap Co SD 7 WWTPHW:38773750 population served2012
NACHES STPHW:38616725 population served2012
GEORGE STPHW:38542690 population served2012
CONCRETE TREATMENTHW:38560641 population served2012
GARFIELD S_T FACILITYHW:38709640 population served2012
ROSALIA S_T FACILITYHW:38743640 population served2012
PE ELL S_T FACILITYHW:38737635 population served2012
LOON LAKE TREATMENTHW:38749634 population served2012
PATEROS S_T FACILITYHW:38736630 population served2012
VADER S_T FACILITYHW:38754625 population served2012
ALBION S_T FACILITYHW:38685620 population served2012
BOSTON HARBOR WWTFHW:38624616 population served2012
CARBONADO S_T FACHW:38548610 population served2012
REARDAN S_T FACILITYHW:38740608 population served2012
FAIRFIELD STPHW:38543595 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.