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

Wastewater treatment plants in the United States

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

Name	Native size	Year
OAKESDALE S_T FACILITYHW:38733	450 population served	2012
WARM SPRINGS PSD GRT CACAPON TPHW:38949	450 population served	2012
COCHRANE WWTPHW:39162	450 population served	2012
ENCAMPMENT LAGOONHW:39668	450 population served	2012
Grady WWTPHW:25660	449 population served	2012
HAWKEYE WWTPHW:29161	449 population served	2012
POLK WWTPHW:32997	449 population served	2012
SHICKLEY WWTPHW:33025	449 population served	2012
MAXWELL LAGOONHW:33427	449 population served	2012
BIRMINGHAM STLHW:28516	448 population served	2012
UNION WWTPHW:29091	448 population served	2012
ELLSWORTH STPHW:31331	448 population served	2012
BELL CITY WWTPHW:32125	448 population served	2012
Sugar Grove WWTP and Sewer SystemHW:35433	448 population served	2012
TRYON UA WWTHW:35875	448 population served	2012
GARRETT BORO STPHW:36505	448 population served	2012
Kingsland WWTPHW:25614	447 population served	2012
NEWINGTON WPCPHW:27263	447 population served	2012
ALMENA WWTPHW:29741	447 population served	2012
THAYER WWTPHW:29785	447 population served	2012
NEW HEBRON POTWHW:31557	447 population served	2012
HOLT WWTPHW:31866	447 population served	2012
MEADOW GROVE WWTPHW:33056	447 population served	2012
ROCKFORD S_T FACILITYHW:38742	447 population served	2012
PACKWAUKEE SD 1 STPHW:39548	447 population served	2012
ASSARIA WWTPHW:29626	446 population served	2012
ELLSINORE WWTPHW:31841	446 population served	2012
HALE WWTPHW:32112	446 population served	2012
Tri City WWTPHW:25775	445 population served	2012
BOTTLE BAY S_T FACILITYHW:27496	445 population served	2012
MILES WWTPHW:29198	445 population served	2012
AXTELL WWTPHW:29303	445 population served	2012
MIZE POTWHW:31545	445 population served	2012
IRONDALE WWTPHW:31837	445 population served	2012
Andes T Sewers and STPHW:33771	445 population served	2012
FINLEY LAGOONHW:34576	445 population served	2012
EAST DUKE WWTHW:35838	445 population served	2012
FREDERICKSBURG MONROE VALLEY STPHW:36584	445 population served	2012
HURTSBORO HCR LAGOONHW:25051	444 population served	2012
BURLINGTON WWTPHW:28212	444 population served	2012
Indian Township WWTFHW:30512	444 population served	2012
Clarington WWTP and Sewer SystemHW:35035	444 population served	2012
RIPLEY WWTHW:35609	444 population served	2012
Lake View Phillips Co WWTPHW:25776	443 population served	2012
MAPLE HILL WWTPHW:29378	443 population served	2012
JORDAN WWTPHW:32548	443 population served	2012
WAGON MOUNDHW:33454	443 population served	2012
HELENA WWTHW:35714	443 population served	2012
ST THOMAS TWP FRANKLIN STPHW:36502	443 population served	2012
GREENTOP WWTPHW:32154	442 population served	2012
MALCOLM WWTPHW:32915	442 population served	2012
Leslie WWTPHW:25732	441 population served	2012
NOXAPATER NORTH LAGOONHW:31560	441 population served	2012
SCAMMON WWTPHW:29599	440 population served	2012
ISLAND STPHW:29990	440 population served	2012
CLARK TWP STPHW:31154	440 population served	2012
TUNICA CO UD WHITE OAK WWTFHW:31688	440 population served	2012
RAVENWOOD WWTPHW:31978	440 population served	2012
GALENA WWTPHW:32366	440 population served	2012
BEAVER CROSSING WWTPHW:33097	440 population served	2012
Fort Ann V WWTPHW:33817	440 population served	2012
Holmesville WWTP and SewersHW:35528	440 population served	2012
Newcastle WWTPHW:37882	440 population served	2012
MESA S_T FACILITYHW:38728	440 population served	2012
BAGGS LAGOONHW:39676	440 population served	2012
Mesa County Lower Valley PIDHW:26469	439 population served	2012
CALAMUS STLHW:28542	439 population served	2012
LAWLER STLHW:28801	439 population served	2012
OAKVILLE LAGOONHW:28932	439 population served	2012
EAST HODGE STPHW:30263	439 population served	2012
BUTTE FALLS STPHW:36097	439 population served	2012
PAGE KINCAID PSD PAGE WWTPHW:38838	439 population served	2012
HOLLY POND WWTPHW:25180	438 population served	2012
Fleming Town ofHW:26494	438 population served	2012
WAYNESVILLEHW:27958	438 population served	2012
EMERSON WWTPHW:28665	438 population served	2012
DELTA WWTPHW:31842	438 population served	2012
Portia WWTPHW:25652	437 population served	2012
GAMALIELHW:29972	437 population served	2012
Harbor View WWTPHW:30553	437 population served	2012
UNION STAR WWTPHW:32159	437 population served	2012
CLEARWATER WWTPHW:32745	437 population served	2012
Canaan WWTFHW:33175	437 population served	2012
Edison WWTP and Sewer SystemHW:34907	437 population served	2012
TURON WWTPHW:29294	436 population served	2012
SCANDIA WWTPHW:29468	436 population served	2012
LUCAS WWTPHW:29621	436 population served	2012
CONVERSE LAGOONHW:30296	436 population served	2012
SCHLATER POTWHW:31602	436 population served	2012
Lake Arthur Town ofHW:33509	436 population served	2012
NWWSD Custar WWTP and SewersHW:34927	436 population served	2012
BILLINGS WWTHW:35920	436 population served	2012
CROWDER PWA WWTHW:35952	436 population served	2012
WASHBURN WWTFHW:32313	435 population served	2012
West Manchester WWTP and Sewer SystemHW:35497	435 population served	2012
LOGANTON BORO AUTH STPHW:36688	435 population served	2012
BLUE RIVER STPHW:39115	435 population served	2012
ETTRICK WWTPHW:39210	435 population served	2012
MATTOON WWTPHW:39318	435 population served	2012
Lost Bridge WWTPHW:25486	434 population served	2012

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.

US EPA · NPDES Permit Basics

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