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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
GREENFIELD WWTPGreenfield1.08 MGD (million gallons per day)2022
OSAGE, WWTPOsage1.071 MGD (million gallons per day)2022
WAPELLO STLWapello1.06 MGD (million gallons per day)2022
MELCHER-DALLAS WWTPMelcher1.059 MGD (million gallons per day)2022
ROCKWELL CITY WWTPRockwell City1.015 MGD (million gallons per day)2022
MADRID WWTPMadrid0.99 MGD (million gallons per day)2022
SULLY STLSully0.99 MGD (million gallons per day)2022
MANCHESTER WWTPManchester0.986 MGD (million gallons per day)2022
SANBORN WWTPSanborn0.983 MGD (million gallons per day)2022
LEON WWTPLeon0.98 MGD (million gallons per day)2022
TIFFIN WWTPTiffin0.975 MGD (million gallons per day)2022
AUDUBON WWTPAudubon0.967 MGD (million gallons per day)2022
SIGOURNEY EAST WWTPSigourney0.95 MGD (million gallons per day)2022
STORY CITY WASTEWATERStory City0.948 MGD (million gallons per day)2022
ATKINS WWTPAtkins0.94 MGD (million gallons per day)2022
CORYDON WWTPCorydon0.936 MGD (million gallons per day)2022
POCAHONTAS WWTPPocahontas0.92 MGD (million gallons per day)2022
SLATER STLSlater0.92 MGD (million gallons per day)2022
BRITT WWTPBritt0.9 MGD (million gallons per day)2022
ESSEX WWTPEssex0.9 MGD (million gallons per day)2022
FREDRICKSBURG WWTPFredericksburg0.9 MGD (million gallons per day)2022
LAMONI WWTPLamoni0.893 MGD (million gallons per day)2022
SHEFFIELD STLSheffield0.888 MGD (million gallons per day)2022
NEW LONDON WWTPNew London0.885 MGD (million gallons per day)2022
GARNER STLGarner0.873 MGD (million gallons per day)2022
PLEASANTVILLE WWTPPleasantville0.87 MGD (million gallons per day)2022
CLARION WWTPClarion0.867 MGD (million gallons per day)2022
POSTVILLE WWTPPostville0.867 MGD (million gallons per day)2022
EARLHAM WWTPEarlham0.85 MGD (million gallons per day)2022
HUXLEY WWTPHuxley0.85 MGD (million gallons per day)2022
WEST UNION NORTH WWTPWest Union0.85 MGD (million gallons per day)2022
DANVILLE STLDanville0.83 MGD (million gallons per day)2022
DYSART PLANTDysart0.83 MGD (million gallons per day)2022
TRIPOLI STLTripoli0.83 MGD (million gallons per day)2022
NORTHWOOD WWTPNorthwood0.829 MGD (million gallons per day)2022
LONE TREE SOUTH WWTPLone Tree0.822 MGD (million gallons per day)2022
SUMNER WASTEWATERSumner0.82 MGD (million gallons per day)2022
ALBIA WWTP NO.Albia0.818 MGD (million gallons per day)2022
GUTTENBURG WWTPGuttenberg0.8 MGD (million gallons per day)2022
FARLEY WWTPFarley0.794 MGD (million gallons per day)2022
WEST BRANCHWest Branch0.792 MGD (million gallons per day)2022
DIKE WWTPDike0.79 MGD (million gallons per day)2022
EVERLY WTPEverly0.785 MGD (million gallons per day)2022
HARTLEY WWTPHartley0.78 MGD (million gallons per day)2022
MOUNT AYR WASTEWATERMount Ayr0.78 MGD (million gallons per day)2022
PRAIRIE CITY STLPrairie City0.78 MGD (million gallons per day)2022
WILTON WWTPWilton0.78 MGD (million gallons per day)2022
BELMOND WWTPBelmond0.777 MGD (million gallons per day)2022
VILLISCA WWTPVillisca0.774 MGD (million gallons per day)2022
MONDAMIN STLMondamin0.766 MGD (million gallons per day)2022
ROCK VALLEY WWTPRock Valley0.753 MGD (million gallons per day)2022
LAKE MILLS WWTPLake Mills0.75 MGD (million gallons per day)2022
NORA SPRINGSNora Springs0.75 MGD (million gallons per day)2022
ELKADER WWTPElkader0.733 MGD (million gallons per day)2022
STUART WWTPStuart0.73 MGD (million gallons per day)2022
REINBECK WWTPReinbeck0.728 MGD (million gallons per day)2022
COLUMBUS JUNCTION STLColumbus Junction0.72 MGD (million gallons per day)2022
GOWRIE WWTPGowrie0.72 MGD (million gallons per day)2022
HULL WWTPHull0.7 MGD (million gallons per day)2022
LAURENS WWTPLaurens0.7 MGD (million gallons per day)2022
SAC CITY WWTPSac City0.7 MGD (million gallons per day)2022
BLOOMFIELD WWTPBloomfield0.692 MGD (million gallons per day)2022
WOODWARD STLWoodward0.692 MGD (million gallons per day)2022
COLFAX WWTPColfax0.685 MGD (million gallons per day)2022
NEW SHARON WTPNew Sharon0.681 MGD (million gallons per day)2022
SOLON WWTPSolon0.68 MGD (million gallons per day)2022
HAWARDEN STPHawarden0.672 MGD (million gallons per day)2022
RIVERSIDE WWTPRiverside0.654 MGD (million gallons per day)2022
DENVER STLDenver0.65 MGD (million gallons per day)2022
KLEMME STLKlemme0.64 MGD (million gallons per day)2022
BROOKLYN WWTPBrooklyn0.63 MGD (million gallons per day)2022
DE SOTO WWTPDe Soto0.63 MGD (million gallons per day)2022
MELBOURNE WWTPMelbourne0.627 MGD (million gallons per day)2022
EDDYVILLE WWTPEddyville0.626 MGD (million gallons per day)2022
LENOX WWTPLenox0.624 MGD (million gallons per day)2022
BLAIRSTOWN WWTPBlairstown0.62 MGD (million gallons per day)2022
NEWHALL WWTPNewhall0.619 MGD (million gallons per day)2022
BELLE PLAINE WWTPBelle Plaine0.609 MGD (million gallons per day)2022
KEOTA WWTPKeota0.608 MGD (million gallons per day)2022
TRAER WWTPTraer0.608 MGD (million gallons per day)2022
BUFFALO WWTPBuffalo0.6 MGD (million gallons per day)2022
CAMANCHE WWTPCamanche0.6 MGD (million gallons per day)2022
FAIRFAX WWTPFairfax0.6 MGD (million gallons per day)2022
HUDSON WWTPHudson0.6 MGD (million gallons per day)2022
STANWOOD WWTPStanwood0.597 MGD (million gallons per day)2022
GRANGER WWTPGranger0.59 MGD (million gallons per day)2022
BEDFORD WWTPBedford0.589 MGD (million gallons per day)2022
WILLIAMSBURG STPWilliamsburg0.585 MGD (million gallons per day)2022
EPWORTH WWTPEpworth0.58 MGD (million gallons per day)2022
STRAWBERRY PT SOUTH WWTPStrawberry Point0.58 MGD (million gallons per day)2022
ONAWA, WWTPOnawa0.568 MGD (million gallons per day)2022
ALTA WWTPAlta0.566 MGD (million gallons per day)2022
LA PORTE CITY WWTPLa Porte City0.566 MGD (million gallons per day)2022
ROLAND STLRoland0.556 MGD (million gallons per day)2022
MARENGO STLMarengo0.55 MGD (million gallons per day)2022
CORNING WWTPCorning0.543 MGD (million gallons per day)2022
ACKLEY WWTPAckley0.53 MGD (million gallons per day)2022
PAULLINA STLPaullina0.527 MGD (million gallons per day)2022
PANORA WWTPPanora0.51 MGD (million gallons per day)2022
ELY WWTPEly0.5 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.