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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
CROSS CITY STP 1 and 2HW:269071,975 population served2012
NISSWA EAST GULL LAKE WWTFHW:312891,975 population served2012
BELINGTON WWTPHW:387841,974 population served2012
WEST PIKE RUN STPHW:367231,973 population served2012
MCMECHEN WWTPHW:389161,973 population served2012
MONTICELLOHW:381391,972 population served2012
SPENCER WWTPHW:394551,972 population served2012
ALICEVILLE WEST LAGOONHW:251251,971 population served2012
Acton Wastewater Collection SystemHW:306981,971 population served2012
CHAFFEE WWTPHW:320991,971 population served2012
CROW AGENCY WWTPHW:325221,970 population served2012
Goliad WWTPHW:376751,970 population served2012
Leavenworth City of POTWHW:387181,970 population served2012
Marion Dept of Public WorksHW:307721,969 population served2012
FREMONT WWTPHW:282141,968 population served2012
BOWMANSTOWN BOROHW:364041,968 population served2012
HORTON WWTPHW:293651,967 population served2012
YALE STPHW:309281,966 population served2012
MANCHESTER STPHW:309711,966 population served2012
Pomeroy WWTP and Sewer SystemHW:353551,966 population served2012
GWINN SEWAGE LAGOONHW:311201,965 population served2012
CAMPBELLSPORT STPHW:391401,965 population served2012
FRUITLAND CITY OF PAYETTE RIVERHW:273871,964 population served2012
IMPERIAL WWTPHW:328751,964 population served2012
FREEPORT BORO STPHW:367451,962 population served2012
ANDERSON WWTPHW:321981,961 population served2012
HULL WWTPHW:287521,960 population served2012
Jamestown STPHW:374111,960 population served2012
ROSENDALE STPHW:394311,958 population served2012
TENNILLE WPCPHW:273001,957 population served2012
NOEL WWTPHW:322691,957 population served2012
STROUD UA SOUTH WWTHW:355671,956 population served2012
PURVIS POTWHW:315841,955 population served2012
BERRIEN SPRINGS STPHW:310421,954 population served2012
GRAYLING STPHW:310341,952 population served2012
ARBUCKLE PSDHW:388271,952 population served2012
Kearny STPHW:253751,950 population served2012
Bull Shoals WWTPHW:256221,950 population served2012
High Springs WWTFHW:266501,950 population served2012
CANEY WWTPHW:297611,950 population served2012
HART STPHW:310831,950 population served2012
JEFFERSON WWTPHW:341301,950 population served2012
VALLEY TWP STPHW:366171,950 population served2012
KINGSTON SPRINGS STPHW:374221,950 population served2012
HAYSI SEWERAGE SYSTEMHW:383201,950 population served2012
SHENANDOAH STPHW:383411,950 population served2012
PACIFIC BEACH STPHW:385841,950 population served2012
GARDEN CITY WWTPHW:319141,949 population served2012
ASH GROVE WWTPHW:318491,948 population served2012
BUTMAN TWP WWSLHW:308571,947 population served2012
SHAW POTWHW:316071,946 population served2012
SPIRIT LAKE TREATMENT FACILITYHW:275001,945 population served2012
ROCK HALL WWTPHW:306081,945 population served2012
BELHAVEN WWTPHW:341381,945 population served2012
WINDSOR SW LAGOONHW:323181,944 population served2012
Phelps V STPHW:339981,944 population served2012
ONANCOCK STPHW:384401,944 population served2012
SHELBY STPHW:310891,942 population served2012
JOANNA COLLECTION SYSTEMHW:372531,942 population served2008
Huachuca City WWTFHW:252771,940 population served2012
ELDORADO STPHW:381061,940 population served2012
Castleton on Hudson V STPHW:337271,939 population served2012
Miami WWTFHW:252901,937 population served2012
NEW LONDON WWTPHW:289171,937 population served2012
ELKTON STPHW:384521,935 population served2012
BLOOMFIELD WWTPHW:317841,933 population served2012
WILLIAMSPORT WWTPHW:281771,932 population served2012
CHOUTEAU PWA WWTHW:359051,931 population served2012
PORT MATILDA BORO STPHW:366911,930 population served2012
Progreso WWTPHW:376481,930 population served2012
MEDICINE LODGE WWTPHW:292681,929 population served2012
Lorain Co Eaton Homes WWTPHW:352291,928 population served2012
Buffalo WWTPHW:378191,928 population served2012
BOOTHBAY HARBOR WWTFHW:304101,927 population served2012
MONTGOMERY CO SAN DIST 2HW:300771,926 population served2012
UNION STPHW:361961,926 population served2012
WARREN WWTFHW:305031,925 population served2012
NEWTOWN LAGOONHW:346471,925 population served2012
Three Rivers WWTPHW:376711,925 population served2012
CABOOL WWTPHW:321891,924 population served2012
SEBEWAING WWSLHW:311031,923 population served2012
FISH HAVEN AREA REC WW SYSTEMHW:274011,921 population served2012
MOUNT CARROLL STPHW:278881,921 population served2012
SEYMOUR WWTPHW:324021,921 population served2012
SHEFFIELD TWP STPHW:368991,921 population served2012
Cobb Island WWTPHW:305751,920 population served2012
Pima WWTFHW:252931,918 population served2012
WESTMORELAND STPHW:375371,915 population served2012
LAKESIDE STPHW:325971,914 population served2012
RAINIER STPHW:361741,914 population served2012
AFTON LAGOONHW:397011,911 population served2012
CITY OF MORIARTYHW:333991,910 population served2012
Hanover T WWTPHW:341131,910 population served2012
SARDIS POTWHW:316011,908 population served2012
Piketon WWTP and Collection SystemHW:353491,907 population served2012
FRANKTON WWTPHW:280921,905 population served2012
CHRISTMAS MOUNTAIN SDHW:390501,905 population served2012
Cave City WWTPHW:257421,904 population served2012
CALHOUN CITY POTWHW:314131,904 population served2012
Strathmore WWTFHW:261401,902 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.