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
HARRIS WWTPHW:28734	170 population served	2012
ROCK FALLS WWTPHW:29004	170 population served	2012
COLESBURG NW STLHW:28582	167 population served	2012
SPRINGBROOK WWTPHW:29052	167 population served	2012
CLARE WWTPHW:28569	161 population served	2012
WESTFIELD WWTPHW:29130	160 population served	2012
WEST CHESTER WWTPHW:29129	159 population served	2012
CHESTER WWTPHW:28565	158 population served	2012
LITTLE ROCK WWTPHW:28820	157 population served	2012
MARTINSBURG RUSSHW:28862	157 population served	2012
SEARSBORO STLHW:29029	155 population served	2012
NODAWAY WWTPHW:28924	153 population served	2012
LANESBORO STLHW:28793	152 population served	2012
HILLSBORO STLHW:28742	151 population served	2012
MELROSE WWTPHW:28870	150 population served	2012
ST PAUL STPHW:29023	150 population served	2012
DEWAR SD STLHW:29208	150 population served	2012
HOMESTEAD SDHW:29211	150 population served	2012
HARPER WWTPHW:28732	147 population served	2012
WILLIAMSON WWTPHW:29142	146 population served	2012
BRAYTON STLHW:28531	145 population served	2012
RUTLAND LAGOONHW:29017	145 population served	2012
WELDON WWTPHW:29121	145 population served	2012
WATERVILLE WWTPHW:29114	140 population served	2012
ST DONATUS STPHW:29200	140 population served	2012
NEW LIBERTY SEPTIC TANKSHW:28916	139 population served	2012
BRUNSVILLE WWTPHW:28537	137 population served	2012
WHITTEN LAGOONHW:29139	137 population served	2012
MT AUBURN WWTPHW:28897	134 population served	2012
ST MARYS WWTPHW:29022	134 population served	2012
UNIONVILLE WWTPHW:29092	133 population served	2012
CUMMING SEPTIC TANKSHW:28603	132 population served	2012
STANLEY STLHW:29056	128 population served	2012
HOUGHTON STLHW:28750	127 population served	2012
PATTERSON WWTPHW:28958	126 population served	2012
CHILLICOTHE WWTPHW:28566	125 population served	2012
ROME STLHW:29011	124 population served	2012
HONEY CREEK STATE PARK ADLMHW:29219	119 population served	2012
MACKSBURG WWTPHW:28842	113 population served	2012
OYENS LAGOONHW:28950	113 population served	2012
CYLINDER STLHW:28605	112 population served	2012
OTO LAGOONHW:28946	110 population served	2012
CARPENTER SEPTICSHW:28549	109 population served	2012
MOUNT UNION STLHW:28902	108 population served	2012
PROMISE CITY STLHW:28981	108 population served	2012
CROMWELL LAGOONHW:28600	107 population served	2012
RICKETTS STPHW:29203	105 population served	2012
WEBSTER RUSSHW:29120	103 population served	2012
ORAN SAN DISTRICT STPHW:29213	100 population served	2012
ANDOVER STLHW:28482	99 population served	2012
KEOMAH VILLAGE LAGOONHW:29216	97 population served	2012
ORCHARD LAGOONHW:28939	93 population served	2012
PLEASANT PLAIN WWTPHW:28967	93 population served	2012
SPRAGUEVILLE STPHW:29201	89 population served	2012
MAHARISHI VEDIC CITY WWTPHW:29220	85 population served	2012
KINROSS RUSSHW:28782	73 population served	2012
BALLTOWN SEPTIC TANKSHW:28502	68 population served	2012
DOLLIVER STPHW:28629	65 population served	2012
PLANO WWTPHW:28966	61 population served	2012
RINARD STLHW:28999	55 population served	2012
ARGYLEHW:28488	47 population served	2012
MT STERLING RUSSHW:28901	36 population served	2012
BANKSTON STPHW:29193	15 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.