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
Sun Valley Sanitary DistrictHW:28661	425 population served	2012
MONDAMIN STLHW:28647	423 population served	2012
THORNTON STLHW:29080	422 population served	2012
MASSENA WWTPHW:28864	414 population served	2012
LINN GROVE WWTPHW:28817	405 population served	2012
TERRIL WWTPHW:29077	404 population served	2012
ORIENT LAGOONHW:28940	402 population served	2012
NEW VIENNA WWTPHW:28921	400 population served	2012
DENMARK SAN DISTR STPHW:29215	400 population served	2012
BENNETT STLHW:28514	395 population served	2012
CHARLOTTE STLHW:28561	394 population served	2012
LYNNVILLE STLHW:28835	393 population served	2012
LETTS WWTPHW:28811	390 population served	2012
WESLEY WWTPHW:29125	390 population served	2012
SPILLVILLE WWTPHW:29177	387 population served	2012
CHURDAN WWTPHW:28567	386 population served	2012
UTE WWTLHW:29094	385 population served	2012
CALLENDER STLHW:28543	384 population served	2012
FERTILE WWTPHW:28682	382 population served	2012
PIERSON WWTPHW:28963	381 population served	2012
PLYMOUTH WWTPHW:28969	381 population served	2012
DANBURY SEWAGE LAGOONHW:28608	380 population served	2012
HOLY CROSS WWTPHW:28746	374 population served	2012
PETERSON STPHW:29183	372 population served	2012
GARRISON WWTPHW:28698	371 population served	2012
FARNHAMVILLE STLHW:28679	370 population served	2012
RUDD WWTPHW:29013	369 population served	2012
SALIX WWTPHW:29025	367 population served	2012
FORT ATKINSON SEPTICSHW:29174	367 population served	2012
NICHOLS STLHW:28923	366 population served	2012
CINCINNATI STLHW:28568	363 population served	2012
MARBLE ROCK WWTPHW:28855	361 population served	2012
RYAN WWTPHW:29018	361 population served	2012
WORTHINGTON WWTPHW:29151	361 population served	2012
FLOYD WWTPHW:28684	359 population served	2012
ATALISSA STLHW:28493	357 population served	2012
LACONA WWTPHW:28785	357 population served	2012
MENLO WWTPHW:28871	356 population served	2012
CORWITH LAGOONHW:28594	350 population served	2012
ELLIOTT STLHW:28660	350 population served	2012
MINBURN STLHW:28879	346 population served	2012
DEEP RIVER STLHW:28614	345 population served	2012
WILLIAMS STLHW:29140	344 population served	2012
HARCOURT WWTPHW:28730	341 population served	2012
IRWIN WASTE STAB PONDSHW:28764	341 population served	2012
DIAMOND JO WORTHHW:28929	337 population served	2012
STEAMBOAT ROCK WASTE WATEHW:29060	335 population served	2012
DOUDS_LEANDO WWSHW:29217	335 population served	2012
QUIMBY WWTPHW:28984	334 population served	2012
BLAKESBURG WWTPHW:28519	333 population served	2012
DIAGONAL STLHW:28626	330 population served	2012
HARPERS FERRY WWTPHW:28733	330 population served	2012
CRYSTAL LAKE WWTPHW:28601	325 population served	2012
IONIA WWTPHW:28760	325 population served	2012
LIBERTYVILLE WWTPHW:28813	325 population served	2012
AUBURN STLHW:28496	322 population served	2012
TEMPLETON WWTPHW:29076	321 population served	2012
BRANDON WWTPHW:28530	320 population served	2012
LYTTON WWTPHW:28836	320 population served	2012
DONAHUE WWTPHW:28630	316 population served	2012
KELLERTON WWTPHW:28772	314 population served	2012
GRANVILLE WWTPHW:28717	312 population served	2012
MONTOUR STLHW:28890	312 population served	2012
LELAND WWTPHW:28806	311 population served	2012
MCCAUSLAND WWTPHW:28838	308 population served	2012
RUNNELLS STPHW:29014	306 population served	2012
VOLGA CITY WWTPHW:29102	306 population served	2012
BALDWIN WWTPHW:29195	306 population served	2012
RIVERTON WWTPHW:29003	304 population served	2012
TWIN LAKES STPHW:29212	300 population served	2012
WESTSIDE STLHW:29206	299 population served	2012
STOCKPORT WWTPHW:29061	296 population served	2012
CUMBERLAND WWTPHW:28602	295 population served	2012
RIDGEWAY WSLHW:29176	295 population served	2012
MCCALLSBURG STLHW:28837	292 population served	2012
FARMERSBURG WWTPHW:28677	291 population served	2012
KIMBALLTON STLHW:28780	289 population served	2012
LADORA STLHW:28786	287 population served	2012
MALCOM STLHW:28844	287 population served	2012
PRESCOTT WWTPHW:28977	287 population served	2012
DEFIANCE STLHW:28615	284 population served	2012
WASHTA WWTPHW:29112	284 population served	2012
PROTIVIN WWTPHW:29169	283 population served	2012
GRAFTON WWTPHW:28711	282 population served	2012
LINEVILLE STLHW:28816	282 population served	2012
DEDHAM STLHW:28613	280 population served	2012
LOW MOOR WWTPHW:28831	280 population served	2012
MARTELLE WASTE STAB PONDSHW:28860	280 population served	2012
KIRON WWTPHW:28783	279 population served	2012
COIN WWTPHW:28581	278 population served	2012
WAUCOMA WWTPHW:29165	277 population served	2012
CLEGHORN WWTPHW:28576	275 population served	2012
MAURICE WWTPHW:28865	275 population served	2012
RIPPEY WWTPHW:29001	275 population served	2012
ARTHUR STLHW:28490	272 population served	2012
COLESBURG SE STLHW:28583	272 population served	2012
RHODES STLHW:28996	272 population served	2012
ROWLEY STLHW:29012	272 population served	2012
LA MOTTE STPHW:29197	272 population served	2012
LAUREL STLHW:28799	271 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.