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

Wastewater treatment plants in United States · Iowa

763 inventory records · HydroWASTE v1.0 / United States

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

763 results

Name	Native size	Year
DAKOTA CITY WWTPHW:28606	911 population served	2012
LAWTON LAGOONHW:28802	908 population served	2012
ROCKFORD WWTPHW:29005	907 population served	2012
EARVILLE STPHW:28648	900 population served	2012
SWISHER WWTPHW:29073	900 population served	2012
PALO WWTPHW:28952	899 population served	2012
MANILLA WWTPHW:28848	898 population served	2012
MONTPELIER SDHW:28891	898 population served	2012
ADAIR WWTPHW:28460	894 population served	2012
NEOLA WWTPHW:28909	892 population served	2012
NEWELL WWTPHW:28912	887 population served	2012
DAYTON WWTPHW:28459	884 population served	2012
MORNING SUN STLHW:28895	872 population served	2012
JANESVILLE WWTPHW:28765	870 population served	2012
EDGEWOOD STPHW:28651	864 population served	2012
WEST BEND WWTPHW:29126	862 population served	2012
BANCROFT STLHW:28503	857 population served	2012
ALDEN WWTPHW:28471	855 population served	2012
INWOOD STLHW:28759	855 population served	2012
LE GRAND STLHW:28804	854 population served	2012
NEWHALL WWTPHW:28913	854 population served	2012
WINTHROP STPHW:29146	850 population served	2012
AFTON CITY OF STPHW:28462	845 population served	2012
HUBBARD LAGOONHW:28751	845 population served	2012
SULLY STLHW:29069	841 population served	2012
WALL LAKE STLHW:29108	840 population served	2012
RICEVILLE WWPTHW:29170	840 population served	2012
HEDRICK WWTPHW:28739	837 population served	2012
REDFIELD STLHW:28990	835 population served	2012
SCHLESWIG STLHW:29204	833 population served	2012
HAZELTON WWTPHW:28738	823 population served	2012
CORRECTIONVILLE WWTPHW:28593	821 population served	2012
BATTLE CREEK WWTPHW:28507	818 population served	2012
GRAETTINGER STLHW:28710	813 population served	2012
OSSIAN WWTPHW:29175	810 population served	2012
GRAND JUNCTION WWTPHW:28712	808 population served	2012
HINTON WWTPHW:28743	808 population served	2012
READLYN WWTPHW:28988	808 population served	2012
GILBERT STLHW:28701	796 population served	2012
MELBOURNE WWTPHW:28869	790 population served	2012
CLEARFIELD WWTPHW:28574	788 population served	2012
LARCHWOOD STLHW:28796	788 population served	2012
LOWDEN WWTPHW:28830	786 population served	2012
MILO WWTPHW:28877	775 population served	2012
COLO STLHW:28586	771 population served	2012
HARTFORD STLHW:28735	768 population served	2012
SCHALLER LAGOONHW:29027	768 population served	2012
RUTHVEN STLHW:29016	765 population served	2012
WHAT CHEER WWTPHW:29135	762 population served	2012
WHITING WWTPHW:29137	762 population served	2012
MERRILL WWTPHW:28873	755 population served	2012
GILBERTVILLE WWTPHW:28702	748 population served	2012
DUNKERTON WWTPHW:28640	746 population served	2012
FREMONT STPHW:29189	743 population served	2012
DELTA WWTPHW:28619	737 population served	2012
MURRAY STLHW:28905	731 population served	2012
GARNAVILLO WWTPHW:28696	727 population served	2012
WHEATLAND WWTPHW:29136	723 population served	2012
ROLFE STPHW:29214	721 population served	2012
SIOUX RAPIDS WWTPHW:29044	720 population served	2012
VAN HORNE WWTPHW:29095	716 population served	2012
STRATFORD WWTPHW:29066	715 population served	2012
GOLDFIELD STLHW:28707	710 population served	2012
SUTHERLAND STLHW:29071	707 population served	2012
EVERLY WTPHW:29182	706 population served	2012
SEYMOUR STLHW:29030	701 population served	2012
MONROE WEST STLHW:28887	700 population served	2012
ALBERT CITY WWTPHW:28466	699 population served	2012
SHELBY WWTPHW:29033	696 population served	2012
HOPKINTON WWTPHW:28747	695 population served	2012
STANTON STLHW:29057	692 population served	2012
KEYSTONE WWTPHW:28779	687 population served	2012
BRIGHTON WWTPHW:28534	684 population served	2012
ELKHART WWTPHW:28657	683 population served	2012
NEW HARTFORD STLHW:28915	683 population served	2012
BLAIRSTOWN WWTPHW:28518	682 population served	2012
LATIMER COULTER WWTPHW:28798	682 population served	2012
STANWOOD WWTPHW:29058	680 population served	2012
HILLS WWTPHW:28741	679 population served	2012
MORAVIA STLHW:28894	679 population served	2012
WALKER W W LAGOONHW:29106	673 population served	2012
FONTANELLE STLHW:28686	672 population served	2012
HOSPERS WWTPHW:28749	672 population served	2012
ELK HORN WWTPHW:28658	669 population served	2012
OXFORD WWTPHW:28948	668 population served	2012
OLIN WWTPHW:28935	663 population served	2012
POMEROY STLHW:28972	662 population served	2012
DOWS WWTPHW:28634	660 population served	2012
COGGON WWTPHW:28580	658 population served	2012
LONE TREE SOUTH WWTPHW:28825	657 population served	2012
FARMINGTON WWTPHW:28678	655 population served	2012
ELMA WWTPHW:29167	653 population served	2012
KANAWHA STLHW:28771	652 population served	2012
WELLSBURG WWTPHW:29123	650 population served	2012
EARLY WWTPHW:28649	649 population served	2012
FONDA WWTPHW:28685	646 population served	2012
SAVAGE SD STLHW:29209	641 population served	2012
ANTHON WWTPHW:28485	638 population served	2012
DUMONT STLHW:28637	637 population served	2012
ELGIN WWTPHW:29160	637 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.