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

Wastewater treatment plants in United States · Iowa

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775 inventory records · EPA Clean Watersheds Needs Survey 2022

Data years: 2022. The inventory date does not establish current operation.

775 results

CompareNameNative sizeYear
PLYMOUTH WWTPPlymouth0.237 MGD (million gallons per day)2022
MARCUS WWTPMarcus0.235 MGD (million gallons per day)2022
WALNUT WWTPWalnut0.234 MGD (million gallons per day)2022
SCHLESWIG WASTEWATERSchleswig0.234 MGD (million gallons per day)2022
BRIGHTON WWTPBrighton0.231 MGD (million gallons per day)2022
LONG GROVE WWTPLong Grove0.23 MGD (million gallons per day)2022
NASHUA WWTPNashua0.23 MGD (million gallons per day)2022
DONNELLSON STPDonnellson0.228 MGD (million gallons per day)2022
CLARENCE WWTPClarence0.227 MGD (million gallons per day)2022
WALKER W W LAGOONWalker0.222 MGD (million gallons per day)2022
GEORGE STLGeorge0.218 MGD (million gallons per day)2022
AKRON WWTPAkron0.217 MGD (million gallons per day)2022
ALLERTON SOUTH LAGOONAllerton0.21 MGD (million gallons per day)2022
AURELIA WWTPAurelia0.21 MGD (million gallons per day)2022
NEW HARTFORD STLNew Hartford0.21 MGD (million gallons per day)2022
WHITING, WWTPWhiting0.21 MGD (million gallons per day)2022
SABULA STPSabula0.207 MGD (million gallons per day)2022
TREYNOR NW STLTreynor0.206 MGD (million gallons per day)2022
MORAVIA STLMoravia0.204 MGD (million gallons per day)2022
ELLSWORTH WWTPEllsworth0.203 MGD (million gallons per day)2022
LADORA STLLadora0.201 MGD (million gallons per day)2022
LOWDEN WWTPLowden0.201 MGD (million gallons per day)2022
ALDEN WWTPAlden0.2 MGD (million gallons per day)2022
ALLISON LAGOONAllison0.2 MGD (million gallons per day)2022
CENTER POINT WWTPCenter Point0.2 MGD (million gallons per day)2022
CORWITH LAGOONCorwith0.2 MGD (million gallons per day)2022
GILBERTVILLE WWTPGilbertville0.2 MGD (million gallons per day)2022
VICTOR WASTEWATERVictor0.2 MGD (million gallons per day)2022
NEW VIRGINIA WWTPNew Virginia0.198 MGD (million gallons per day)2022
MANLY WWTPManly0.197 MGD (million gallons per day)2022
OAKLAND WASTEWATEROakland0.196 MGD (million gallons per day)2022
GARNAVILLO WWTPGarnavillo0.194 MGD (million gallons per day)2022
ELDON WWTPEldon0.192 MGD (million gallons per day)2022
ALBIA WWTP W.Albia0.19 MGD (million gallons per day)2022
BIRMINGHAM STLBirmingham0.19 MGD (million gallons per day)2022
LE GRAND STLLe Grand0.19 MGD (million gallons per day)2022
MILO WWTPMilo0.19 MGD (million gallons per day)2022
WELLSBURG WWTPWellsburg0.19 MGD (million gallons per day)2022
AGENCY WWTPAgency0.189 MGD (million gallons per day)2022
BEACON STPBeacon0.189 MGD (million gallons per day)2022
DAYTON WWTPDayton0.186 MGD (million gallons per day)2022
PRESTON WWTPPreston0.186 MGD (million gallons per day)2022
COON RAPIDS WWTPCoon Rapids0.185 MGD (million gallons per day)2022
KANAWHA STLKanawha0.185 MGD (million gallons per day)2022
EARLING WWTPEarling0.183 MGD (million gallons per day)2022
LOVILIA STLLovilia0.182 MGD (million gallons per day)2022
KEOSAUQUA WWTPKeosauqua0.18 MGD (million gallons per day)2022
LAWLER STLLawler0.18 MGD (million gallons per day)2022
MASSENA WWTPMassena0.18 MGD (million gallons per day)2022
SAINT ANSGAR WWTPSaint Ansgar0.18 MGD (million gallons per day)2022
COLO STLColo0.175 MGD (million gallons per day)2022
JEWELL STLJewell0.175 MGD (million gallons per day)2022
LYTTON WWTPLytton0.175 MGD (million gallons per day)2022
OLIN WWTPOlin0.175 MGD (million gallons per day)2022
DUNKERTON WWTPDunkerton0.172 MGD (million gallons per day)2022
AFTON CITY OF STPAfton0.171 MGD (million gallons per day)2022
BANCROFT STLBancroft0.17 MGD (million gallons per day)2022
HAZELTON WWTPHazleton0.17 MGD (million gallons per day)2022
MOULTON WASTEWATERMoulton0.17 MGD (million gallons per day)2022
RUTHVEN STLRuthven0.169 MGD (million gallons per day)2022
HOPKINTON WWTPHopkinton0.167 MGD (million gallons per day)2022
AVOCA WW STAB LAGOONAvoca0.165 MGD (million gallons per day)2022
BUFFALO CENTER WWTPBuffalo Center0.165 MGD (million gallons per day)2022
WORTHINGTON WWTPWorthington0.165 MGD (million gallons per day)2022
SAVAGE SD STLFort Dodge0.165 MGD (million gallons per day)2022
UNDERWOOD STAB PONDUnderwood0.164 MGD (million gallons per day)2022
GRAETTINGER STLGraettinger0.163 MGD (million gallons per day)2022
POMEROY STLPomeroy0.162 MGD (million gallons per day)2022
CENTRAL CITY WWTPCentral City0.161 MGD (million gallons per day)2022
WHITTEMORE WWTPWhittemore0.16 MGD (million gallons per day)2022
BRANDON WWTPBrandon0.158 MGD (million gallons per day)2022
COGGON WWTPCoggon0.158 MGD (million gallons per day)2022
STACYVILLE WWTPStacyville0.158 MGD (million gallons per day)2022
AMANA WWTPAmana0.158 MGD (million gallons per day)2022
MARQUETTE WWTPMarquette0.156 MGD (million gallons per day)2022
STRATFORD WWTPStratford0.155 MGD (million gallons per day)2022
DUNLAP STLDunlap0.154 MGD (million gallons per day)2022
COLLINS STLCollins0.152 MGD (million gallons per day)2022
GRAND JUNCTION WWTPGrand Junction0.152 MGD (million gallons per day)2022
ROCKWELL WTPRockwell0.152 MGD (million gallons per day)2022
VAN METER WWTPVan Meter0.152 MGD (million gallons per day)2022
WOODBINE STLWoodbine0.152 MGD (million gallons per day)2022
CLARKSVILLE WWTPClarksville0.15 MGD (million gallons per day)2022
MONROE WWTP (EAST)Monroe0.15 MGD (million gallons per day)2022
OTHO STLOtho0.15 MGD (million gallons per day)2022
SIOUX RAPIDS WASTEWATERSioux Rapids0.15 MGD (million gallons per day)2022
TABOR WWTPTabor0.15 MGD (million gallons per day)2022
West Amana CDPAmana0.149 MGD (million gallons per day)2022
CALLENDER STLCallender0.147 MGD (million gallons per day)2022
REDFIELD STLRedfield0.142 MGD (million gallons per day)2022
DEXTER WWTPDexter0.14 MGD (million gallons per day)2022
HUBBARD LAGOONHubbard0.136 MGD (million gallons per day)2022
JANESVILLE WWTPJanesville0.136 MGD (million gallons per day)2022
LARCHWOOD STLLarchwood0.135 MGD (million gallons per day)2022
PETERSON STPPeterson0.135 MGD (million gallons per day)2022
EXIRA STLExira0.128 MGD (million gallons per day)2022
FONDA WWTPFonda0.128 MGD (million gallons per day)2022
ANTHON WWTPAnthon0.127 MGD (million gallons per day)2022
ELKHART WWTPElkhart0.127 MGD (million gallons per day)2022
BREDA WWTPBreda0.123 MGD (million gallons per day)2022

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.

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