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
ROUND HILL STPHW:38500	790 population served	2012
LARSEN WINCHESTER SD WWTPHW:39617	790 population served	2012
DRYDEN WWTFHW:30915	789 population served	2012
Shannon POTW Lagoon No 2HW:31554	789 population served	2012
CARDWELL WWTPHW:32082	789 population served	2012
CLEARFIELD WWTPHW:28574	788 population served	2012
LARCHWOOD STLHW:28796	788 population served	2012
CONWAY WWTPHW:32470	788 population served	2012
HARMONY WWTPHW:34275	788 population served	2012
BENTON WWTPHW:29796	787 population served	2012
KIMBALL WW TREATMENT PLNTHW:31272	787 population served	2012
RAY CITY PONDHW:27081	786 population served	2012
LOWDEN WWTPHW:28830	786 population served	2012
HOWARD WWTPHW:29781	786 population served	2012
MANILA WWTFHW:25828	785 population served	2012
Naturita Town ofHW:26503	785 population served	2012
New Holland WWTP and Sewer SystemHW:35298	785 population served	2012
SCIENCE HILL STPandCSHW:29963	784 population served	2012
Jewett WWTP and Sewer SystemHW:34751	784 population served	2012
Ohio City WWTP and Sewer SystemHW:35326	784 population served	2012
MARION STPHW:31029	783 population served	2012
LAKE PARK STPHW:31330	783 population served	2012
MOHALL LAGOONHW:34637	783 population served	2012
GIBSON WPCPHW:27208	782 population served	2012
MERIDEN WWTPHW:29381	782 population served	2012
Oppelo WWTPHW:25625	781 population served	2012
Etna Wastewater Treatment FacilityHW:25819	781 population served	2012
Warsaw WWTP and Sewer SystemHW:34749	781 population served	2012
BLUE MOUNDS STPHW:39114	781 population served	2012
RUTLEDGE OXIDATION PONDHW:27086	780 population served	2012
STONINGTON WPCFHW:30498	780 population served	2012
SEELEY LAKE SEPTICHW:32599	780 population served	2012
FAISON WWTPHW:34215	780 population served	2012
METOLIUS STPHW:36148	780 population served	2012
COPPERHILL STPHW:37354	780 population served	2012
Celeste WWTPHW:37915	780 population served	2012
Mertzon WWTPHW:38105	780 population served	2012
CLALLAM BAY STPHW:38554	780 population served	2012
PORTLAND BORO STPHW:36384	779 population served	2012
CLAYTON STPHW:27994	778 population served	2012
UNDERWOOD LAGOONHW:34697	778 population served	2012
CHEYENNE WWTHW:35969	778 population served	2012
AMELIA SAN DIST STPHW:38430	778 population served	2012
Weiner WWTPHW:25706	777 population served	2012
HASTINGS STPHW:26971	777 population served	2012
HATTON LAGOONHW:34599	777 population served	2012
VERMONTVILLE WWTLHW:30831	776 population served	2012
BAYVIEW S_T PLANTHW:27398	775 population served	2012
MAZON STPHW:27871	775 population served	2012
MILO WWTPHW:28877	775 population served	2012
LaRue WWTP and Sewer SystemHW:34733	775 population served	2012
MIDDLETOWN STPHW:38406	775 population served	2012
OLYMPIAN VILLAGE STPHW:32043	774 population served	2012
New Straitsville WWTP and SewersHW:35313	774 population served	2012
LEWISBERRY BORO COUNCILHW:36587	774 population served	2012
COTTONWOOD LAGOONHW:25148	773 population served	2012
DUNSEITH LAGOONHW:34564	773 population served	2012
BRUCE WWTPHW:39133	773 population served	2012
Hardy WWTPHW:25743	772 population served	2012
TAMPICO STPHW:27916	772 population served	2012
COLO STLHW:28586	771 population served	2012
VALLIANT WWTHW:35891	771 population served	2012
SLIGO BORO AUTH STPHW:36887	771 population served	2012
BEVERLY WWTPHW:39000	771 population served	2012
HOLLYWOOD LAGOONHW:25181	770 population served	2012
Mountain Pine WWTPHW:25559	770 population served	2012
ELKTON WWSLHW:30870	770 population served	2012
Friendship T WWTP and OnsitesHW:34055	770 population served	2012
Shawnee WWTP and Sewer SystemHW:35410	770 population served	2012
CONDON STPHW:36107	770 population served	2012
WILD ROSE WWTPHW:39519	770 population served	2012
Madison WWTPHW:25726	769 population served	2012
EDGAR WWTPHW:32785	769 population served	2012
HARTFORD STLHW:28735	768 population served	2012
SCHALLER LAGOONHW:29027	768 population served	2012
WINNEBAGO WWTPHW:33073	768 population served	2012
WILSON WWTPHW:29665	767 population served	2012
FULTON POTW WEST CENTRALHW:31479	767 population served	2012
Jefferson Township RSDHW:28407	766 population served	2012
HENEFERHW:38198	766 population served	2012
RUTHVEN STLHW:29016	765 population served	2012
LAKEVIEW STPHW:30885	765 population served	2012
GOLDEN CITY WWTPHW:32167	765 population served	2012
VIOLA STPHW:39492	765 population served	2012
GOSPORT WWTPHW:28383	764 population served	2012
CLARKSON STPHW:30000	764 population served	2012
South Webster WWTP and Sewer SystemHW:34766	764 population served	2012
PATTERSON WPCPHW:27080	763 population served	2012
MACKSVILLE WWTPHW:29265	763 population served	2012
DONIPHAN WWTPHW:32779	763 population served	2012
Port Leyden V WWTPHW:33862	763 population served	2012
GURLEY WWTPHW:25039	762 population served	2012
Buckeye Tartesso West WRFHW:25311	762 population served	2012
Quitman WWTPHW:25517	762 population served	2012
Tyronza WWTPHW:25705	762 population served	2012
RIPLEY WWTFHW:26205	762 population served	2012
Loma Linda SDHW:26531	762 population served	2012
WHAT CHEER WWTPHW:29135	762 population served	2012
WHITING WWTPHW:29137	762 population served	2012
ANGUILLA POTWHW:31382	762 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.