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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
DES MOINES METRO WRA WWTPDes Moines134 MGD (million gallons per day)2022
CEDAR RAPIDS WWTPCedar Rapids56 MGD (million gallons per day)2022
SIOUX CITY WWTPSioux City29.6 MGD (million gallons per day)2022
DAVENPORT WWTPDavenport26 MGD (million gallons per day)2022
IOWA CITY SOUTH WWTPIowa City24.2 MGD (million gallons per day)2022
WATERLOO WWTPWaterloo20.35 MGD (million gallons per day)2022
FT. DODGE WWTPFort Dodge15 MGD (million gallons per day)2022
MASON CITY WWTPMason City14.9 MGD (million gallons per day)2022
COUNCIL BLUFFS WWTPCouncil Bluffs14 MGD (million gallons per day)2022
DUBUQUE WWTPDubuque13.47 MGD (million gallons per day)2022
MARSHALLTOWN WWTPMarshalltown13.04 MGD (million gallons per day)2022
AMES WWTPAmes12.1 MGD (million gallons per day)2022
CLINTON WWTPClinton12 MGD (million gallons per day)2022
BURLINGTON WWTPBurlington10.85 MGD (million gallons per day)2022
MUSCATINE WWTPMuscatine10.3 MGD (million gallons per day)2022
OTTUMWA WWTPOttumwa10 MGD (million gallons per day)2022
CEDAR FALLS WWTPCedar Falls8.8 MGD (million gallons per day)2022
FT MADISON WWTPFort Madison7.29 MGD (million gallons per day)2022
BOONE WWTPBoone7 MGD (million gallons per day)2022
STORM LAKE WWTPStorm Lake6.45 MGD (million gallons per day)2022
WASHINGTON WWTPWashington6.24 MGD (million gallons per day)2022
CORALVILLE STLCoralville5.754 MGD (million gallons per day)2022
CLEAR LAKE SEWER DISTClear Lake5.7 MGD (million gallons per day)2022
PERRY WWTPPerry5.2 MGD (million gallons per day)2022
IOWA GREAT LAKES WWTPMilford5.17 MGD (million gallons per day)2022
KEOKUK WWTPKeokuk5 MGD (million gallons per day)2022
CHARLES CITY WWTPCharles City4.66 MGD (million gallons per day)2022
DECORAH WWTPDecorah4.32 MGD (million gallons per day)2022
PELLA WWTPPella4.31 MGD (million gallons per day)2022
OELWEIN STPOelwein4.27 MGD (million gallons per day)2022
GRINNELL WWTPGrinnell4.236 MGD (million gallons per day)2022
CARROLL WWTPCarroll4.2 MGD (million gallons per day)2022
FAIRFIELD WWTPFairfield4.2 MGD (million gallons per day)2022
DENISON WWTPDenison4.17 MGD (million gallons per day)2022
EAGLE GROVE WWTPEagle Grove4.15 MGD (million gallons per day)2022
OSKALOOSA SW STPOskaloosa4.024 MGD (million gallons per day)2022
INDEPENDENCE WWTPIndependence4 MGD (million gallons per day)2022
MOUNT PLEASANT WWTPMount Pleasant4 MGD (million gallons per day)2022
NEVADA WWTPNevada3.71 MGD (million gallons per day)2022
SPENCER WWTPSpencer3.7 MGD (million gallons per day)2022
CRESTON WWTPCreston3.6 MGD (million gallons per day)2022
ESTHERVILLE WWTPEstherville3.5 MGD (million gallons per day)2022
ADEL WWTPAdel3.4 MGD (million gallons per day)2022
WEBSTER CITY WASTEWATERWebster City3.3 MGD (million gallons per day)2022
LEMARS WWTPLe Mars3.14 MGD (million gallons per day)2022
KNOXVILLE WWTFKnoxville3.07 MGD (million gallons per day)2022
SHELDON WWTPSheldon3.025 MGD (million gallons per day)2022
NEWTON WWTPNewton2.94 MGD (million gallons per day)2022
HUMBOLDT WWTPHumboldt2.7 MGD (million gallons per day)2022
RED OAK WWTPRed Oak2.7 MGD (million gallons per day)2022
ATLANTIC WWTPAtlantic2.65 MGD (million gallons per day)2022
OSCEOLA WWTP SOUTHOsceola2.648 MGD (million gallons per day)2022
IOWA FALLS WWTPIowa Falls2.625 MGD (million gallons per day)2022
ALGONA WWTPAlgona2.6 MGD (million gallons per day)2022
INDIANOLA NORTH WWTPIndianola2.5 MGD (million gallons per day)2022
JEFFERSON WWTPJefferson2.45 MGD (million gallons per day)2022
CRESCO WWTPCresco2.436 MGD (million gallons per day)2022
ELDRIDGE WWTPEldridge2.4 MGD (million gallons per day)2022
CHEROKEE WWTPCherokee2.387 MGD (million gallons per day)2022
WAVERLY WWTPWaverly2.33 MGD (million gallons per day)2022
JESUP WWTPJesup2.25 MGD (million gallons per day)2022
SIOUX CENTER WWTPSioux Center2.21 MGD (million gallons per day)2022
WEST LIBERTY WASTEWATERWest Liberty2.21 MGD (million gallons per day)2022
NEW HAMPTON WWTPNew Hampton2.2 MGD (million gallons per day)2022
DEWITT WWTPDe Witt2.14 MGD (million gallons per day)2022
TAMA WWTPTama2 MGD (million gallons per day)2022
ORANGE CITY WWTPOrange City1.9 MGD (million gallons per day)2022
SHENANDOAH WWTPShenandoah1.88 MGD (million gallons per day)2022
WEST BURLINGTON WWTPWest Burlington1.85 MGD (million gallons per day)2022
VINTON WWTPVinton1.78 MGD (million gallons per day)2022
HARLAN WWTPHarlan1.777 MGD (million gallons per day)2022
WINTERSET WWTPWinterset1.75 MGD (million gallons per day)2022
MITCHELLVILLE WWTPMitchellville1.69 MGD (million gallons per day)2022
WAUKON WWTPWaukon1.652 MGD (million gallons per day)2022
FOREST CITY WWTPForest City1.65 MGD (million gallons per day)2022
ASBURY WWTPDubuque1.626 MGD (million gallons per day)2022
LECLAIRE WWTPLe Claire1.54 MGD (million gallons per day)2022
EVANSDALE WWTPEvansdale1.517 MGD (million gallons per day)2022
ELDORA WWTPEldora1.515 MGD (million gallons per day)2022
CENTERVILLE NE WWTPCenterville1.5 MGD (million gallons per day)2022
EMMETSBURG WWTPEmmetsburg1.5 MGD (million gallons per day)2022
CARLISLE WWTPCarlisle1.48 MGD (million gallons per day)2022
MOUNT VERNON WWTPMount Vernon1.436 MGD (million gallons per day)2022
GLENWOOD WWTPGlenwood1.4 MGD (million gallons per day)2022
HAMPTON WWTPHampton1.374 MGD (million gallons per day)2022
WALCOTT WASTEWATERWalcott1.308 MGD (million gallons per day)2022
MAQUOKETA WWTPMaquoketa1.3 MGD (million gallons per day)2022
ANAMOSA WWTPAnamosa1.25 MGD (million gallons per day)2022
CASCADE WWTPCascade1.25 MGD (million gallons per day)2022
MONTEZUMA WWTPMontezuma1.25 MGD (million gallons per day)2022
OGDEN STPOgden1.218 MGD (million gallons per day)2022
DALLAS CENTER WWTPDallas Center1.2 MGD (million gallons per day)2022
GRUNDY CENTER WWTPGrundy Center1.2 MGD (million gallons per day)2022
NORTH LIBERTY WWTPNorth Liberty1.19 MGD (million gallons per day)2022
DYERSVILLE WWTPDyersville1.179 MGD (million gallons per day)2022
MONTICELLO WWTPMonticello1.14 MGD (million gallons per day)2022
TIPTON WWTP (West)Tipton1.14 MGD (million gallons per day)2022
CHARITON WWTPChariton1.115 MGD (million gallons per day)2022
SIBLEY WWTPSibley1.104 MGD (million gallons per day)2022
TOLEDO WWTPToledo1.1 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.