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

Wastewater treatment plants in the United States

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14,626 inventory records · HydroWASTE v1.0 / United States

Data years: 2008, 2012. The inventory date does not establish current operation.

States

14,626 results

CompareNameNative sizeYear
INDEPENDENCE WWTPHW:297759,527 population served2012
CODY LAGOONHW:397069,520 population served2012
ELK CITY MAIN WWTHW:357269,510 population served2012
UNION LAGOONHW:318799,504 population served2012
MONTECITO WWTFHW:259159,500 population served2012
Anderson WWTFHW:259869,500 population served2012
Mount CRESTED BUTTE WsdHW:263089,500 population served2012
WESTPORT WPCFHW:266159,500 population served2012
Okeechobee UA WWTPHW:269559,500 population served2012
COALDALE LANSFORD STPHW:363059,499 population served2012
El Dorado North WWTPHW:254249,491 population served2012
WARRENSBURG W WWTPHW:317559,487 population served2012
SEAFORD STPHW:266339,482 population served2012
Red River Town ofHW:334939,477 population served2012
Lower Township MUA STP_CS_SepticsHW:333319,476 population served2012
CONNEAUT LAKE JT MUN AUTH STPHW:369549,472 population served2012
BELMONT WWTPHW:342379,470 population served2012
HUMBOLDT STPHW:374069,470 population served2012
FRANKLIN SEWAGE TR PLANTHW:383559,466 population served2012
PA DEPT OF CORRECTIONS GRATERFORDHW:369649,465 population served2012
Mahoning Co Campbell WWTPHW:350199,460 population served2012
Maynard Department of Public WorksHW:307879,453 population served2012
CREVE COEUR STPHW:277759,446 population served2012
Monmouth City ofHW:275529,444 population served2012
Portage Co Franklin Hills WWTPHW:350009,444 population served2012
HIGHLAND STPHW:276549,433 population served2012
GUYMON UA NORTH WWTHW:359919,425 population served2012
GREENCASTLE WWTPHW:281659,423 population served2012
BERK CO PSSD INWOOD WWTPHW:387989,422 population served2012
WEST CHESTER _ GOOSE CREEK STPHW:362439,407 population served2012
EAST TROY STPHW:391969,407 population served2012
TUNICA CO U D ROBINSONVILLEHW:316939,400 population served2012
INCLINE VILLAGEHW:331179,400 population served2012
VALLEY JT SA STP ATHENSHW:364179,398 population served2012
El Dorado South WWTPHW:254239,393 population served2012
NEW FREEDOM STPHW:365639,390 population served2012
Media STPHW:362159,386 population served2012
ST CLAIR RIVER SA WWTPHW:309299,383 population served2012
OREGON STPHW:393709,382 population served2012
BUCKHANNON WWTPHW:390249,376 population served2012
ROCKMART WPCPHW:272829,370 population served2012
HILL N PARK STPHW:263109,366 population served2012
ANTHONY CSHW:334329,360 population served2012
SHIPROCK STPHW:334509,359 population served2012
EUREKA WWTPHW:319669,353 population served2012
Lenox Dept of Public WorksHW:308119,352 population served2012
Huntley East PlantHW:277679,345 population served2012
Huntley West PlantHW:277689,345 population served2012
Trinidad City ofHW:263559,344 population served2012
BLACKRIVER WWTP DUNNHW:342599,331 population served2012
Stuttgart WWTPHW:254429,326 population served2012
Napoleon WWTP and Sewer SystemHW:349649,318 population served2012
LARKFIELD WIKIUP WWTFHW:258309,306 population served2012
PARIS STP and CSHW:300309,304 population served2012
CENTRAL CARBON REGIONAL STPHW:364489,302 population served2012
Santa Maria Reclamation PlantHW:262499,300 population served2012
ST CHARLES WEST BK STPHW:303039,300 population served2012
Covington STPHW:373569,300 population served2012
GARDINER WPCFHW:304229,299 population served2012
Hudson Dept of Public WorksHW:307419,299 population served2012
SIMSBURY WPCFHW:265979,288 population served2012
Middlebury WPCFHW:382519,280 population served2012
OXFORD WWTPHW:342459,279 population served2012
MOORESVILLE WWTPHW:280149,273 population served2012
FARMINGTON WWTP EASTHW:322329,270 population served2012
RAWLINS LAGOONHW:396509,259 population served2012
LIBERTY LAKE STPHW:387679,255 population served2012
SALIDA WWTPHW:263049,235 population served2012
VIDALIA NORTHEAST WPCPHW:270939,232 population served2012
HOWELL STPHW:309329,232 population served2012
VCUD Southwest Regional STPHW:268889,230 population served2012
Bryan WWTP and Sewer SystemHW:350059,230 population served2012
ASHLAND STPHW:390819,229 population served2012
RUSSELL CO REGIONAL STPHW:299929,227 population served2012
BOLIVAR WWTPHW:324189,211 population served2012
GRINNELL WWTPHW:287229,208 population served2012
SHEFFIELD WWTPHW:250989,200 population served2012
ARVIN WWTFHW:260629,200 population served2012
Snohomish Wastewater SystemHW:386529,200 population served2012
NORTH PLANT A VEREENHW:372219,195 population served2008
Goodyear Corgett WRPHW:253359,189 population served2012
Grants City ofHW:334779,182 population served2012
PORT TOWNSEND STPHW:386419,180 population served2012
CREST HILL STW WESTHW:275939,179 population served2012
Clarksville WWTPHW:256449,178 population served2012
Thompson T WWTP and CollectionHW:336659,176 population served2012
Pismo Beach WWTFHW:258999,175 population served2012
ROCHESTER WWTPHW:282519,173 population served2012
TOMAH WWTPHW:394799,169 population served2012
BERLIN TWP STPHW:311959,164 population served2012
HAZARDHW:298919,155 population served2012
Washington Township Morris MUA CS_Septics_STPHW:333029,150 population served2012
ALBION WWTPHW:310079,144 population served2012
MENOMINEE WWTPHW:310169,131 population served2012
SANTAQUINHW:381639,128 population served2012
ATCHISON WWTPHW:295259,119 population served2012
Delta WWTPHW:264419,100 population served2012
Craig City ofHW:265239,100 population served2012
NORTHFIELD STPHW:309739,099 population served2012
Washington Borough Warren CS_Septics_STPHW:333919,092 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.