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

Wastewater treatment plants in United States · Wisconsin

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586 inventory records · EPA Clean Watersheds Needs Survey 2022

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

586 results

CompareNameNative sizeYear
MILWAUKEE MSD COMBINED - Jones IslandMilwaukee300 MGD (million gallons per day)2022
MILWAUKEE MSD COMBINED - South ShoreSouth Milwaukee265 MGD (million gallons per day)2022
MADISON MSD STPMadison53.6 MGD (million gallons per day)2022
Green Bay MSD (NEW Water) - Green BayGreen Bay49.2 MGD (million gallons per day)2022
RACINE STPRacine36 MGD (million gallons per day)2022
KENOSHA - WWTPKenosha28.6 MGD (million gallons per day)2022
La Crosse WWTPLa Crosse20 MGD (million gallons per day)2022
OSHKOSH WWTPOshkosh20 MGD (million gallons per day)2022
SHEBOYGAN REGIONAL WWTPSheboygan18.4 MGD (million gallons per day)2022
JANESVILLE WWTPJanesville16.1 MGD (million gallons per day)2022
APPLETON WWTPAppleton15.5 MGD (million gallons per day)2022
MANITOWOC WWTPManitowoc15.5 MGD (million gallons per day)2022
WAUKESHA STPWaukesha14 MGD (million gallons per day)2022
BELOIT WWTPBeloit13.2 MGD (million gallons per day)2022
BROOKFIELD - Fox River WPCCBrookfield12.5 MGD (million gallons per day)2022
EAU CLAIRE WWTPEau Claire12 MGD (million gallons per day)2022
Green Bay MSD (NEW Water) - De PereGreen Bay10 MGD (million gallons per day)2022
FOND DU LAC REGIONAL WWTPFond Du Lac9.84 MGD (million gallons per day)2022
WEST BEND WWTPWest Bend9 MGD (million gallons per day)2022
Heart of the Valley MSDKaukauna8.5 MGD (million gallons per day)2022
NEENAH-MENASHA SC WWTPMenasha8.2 MGD (million gallons per day)2022
WAUSAU WWTPWausau8.2 MGD (million gallons per day)2022
Fox West WWTPNeenah8.2 MGD (million gallons per day)2022
SUPERIOR WWTPSuperior7.6 MGD (million gallons per day)2022
WALWORTH COUNTY MSD STPDelavan7 MGD (million gallons per day)2022
SOUTH MILWAUKEE STPSouth Milwaukee6 MGD (million gallons per day)2022
BEAVER DAM WWTPBeaver Dam5.6 MGD (million gallons per day)2022
WATERTOWN STPWatertown5.2 MGD (million gallons per day)2022
Marinette Wastewater UtilityMarinette5.1 MGD (million gallons per day)2022
STEVENS POINT STPStevens Point4.89 MGD (million gallons per day)2022
MARSHFIELD WWTPMarshfield4.63 MGD (million gallons per day)2022
CHIPPEWA FALLS WWTPChippewa Falls4.5 MGD (million gallons per day)2022
SUSSEX REGIONAL WWTPSussex4.1 MGD (million gallons per day)2022
OCONOMOWOC WWTPOconomowoc4 MGD (million gallons per day)2022
WHITEWATER STPWhitewater3.65 MGD (million gallons per day)2022
HARTFORD WPCFHartford3.6 MGD (million gallons per day)2022
BURLINGTON WWTPBurlington3.5 MGD (million gallons per day)2022
MONROE WWTPMonroe3.4 MGD (million gallons per day)2022
Delafield-Hartland WPCCDelafield3.23 MGD (million gallons per day)2022
WISCONSIN RAPIDS STPWisconsin Rapids3.2 MGD (million gallons per day)2022
PORT WASHINGTON WWTPPort Washington3.1 MGD (million gallons per day)2022
TWO RIVERS WWTPTwo Rivers3.07 MGD (million gallons per day)2022
SUN PRAIRIE STPSun Prairie3.065 MGD (million gallons per day)2022
MERRILL STPMerrill3.06 MGD (million gallons per day)2022
RIB MOUNTAIN MSD STPWausau3 MGD (million gallons per day)2022
MENOMONIE WWTPMenomonie2.88 MGD (million gallons per day)2022
STURGEON BAY STPSturgeon Bay2.8 MGD (million gallons per day)2022
CEDARBURG STPCedarburg2.75 MGD (million gallons per day)2022
WIS DELLS-LAKE DELTON STPLake Delton2.73 MGD (million gallons per day)2022
FORT ATKINSON STPFort Atkinson2.7 MGD (million gallons per day)2022
REEDSBURG STPReedsburg2.65 MGD (million gallons per day)2022
WOLF WWTPShawano2.63 MGD (million gallons per day)2022
JEFFERSON STPJefferson2.568 MGD (million gallons per day)2022
BARABOO STPBaraboo2.53 MGD (million gallons per day)2022
WESTERN RACINE CO. SD - STPRochester2.53 MGD (million gallons per day)2022
GRAFTON WWTPGrafton2.5 MGD (million gallons per day)2022
LAKE GENEVA WWTPLake Geneva2.5 MGD (million gallons per day)2022
PESHTIGO WWTPPeshtigo2.474 MGD (million gallons per day)2022
TOMAH WWTPTomah2.282 MGD (million gallons per day)2022
HUDSON WWTPHudson2.2 MGD (million gallons per day)2022
SPARTA WWTPSparta2.2 MGD (million gallons per day)2022
RHINELANDER STPRhinelander2.15 MGD (million gallons per day)2022
ARCADIA WWTPArcadia2.1 MGD (million gallons per day)2022
Salem Lakes, Village ofSalem2.06 MGD (million gallons per day)2022
PLATTEVILLE WWTPPlatteville2.05 MGD (million gallons per day)2022
NEW LONDON WWTPNew London2 MGD (million gallons per day)2022
PORTAGE WWTPPortage2 MGD (million gallons per day)2022
PRAIRIE DU CHIEN WWTPPrairie Du Chien2 MGD (million gallons per day)2022
UNION GROVE WWTPUnion Grove2 MGD (million gallons per day)2022
ASHLAND STPAshland1.92 MGD (million gallons per day)2022
OCONTO WWTPOconto1.81 MGD (million gallons per day)2022
OREGON STPOregon1.8 MGD (million gallons per day)2022
PLOVER WWTPPlover1.8 MGD (million gallons per day)2022
RIPON WWTPRipon1.8 MGD (million gallons per day)2022
RIVER FALLS WWTPRiver Falls1.8 MGD (million gallons per day)2022
WAUPUN WWTPWaupun1.8 MGD (million gallons per day)2022
RICE LAKE STPRice Lake1.79 MGD (million gallons per day)2022
JACKSON WWTPJackson1.69 MGD (million gallons per day)2022
ANTIGO WWTPAntigo1.68 MGD (million gallons per day)2022
STOUGHTON STPStoughton1.65 MGD (million gallons per day)2022
RICHLAND CENTER WWTPRichland Center1.6 MGD (million gallons per day)2022
SAUKVILLE STPSaukville1.6 MGD (million gallons per day)2022
NORWAY, TOWN SD #1 STPWaterford1.6 MGD (million gallons per day)2022
BERLIN STPBerlin1.5 MGD (million gallons per day)2022
MUKWONAGO STPMukwonago1.5 MGD (million gallons per day)2022
PLYMOUTH WWTPPlymouth1.5 MGD (million gallons per day)2022
SLINGER STPSlinger1.5 MGD (million gallons per day)2022
WAUPACA WWTPWaupaca1.5 MGD (million gallons per day)2022
FONTANA-WALWORTH WPCC WWTPFontana1.45 MGD (million gallons per day)2022
TWIN LAKES WWTPTwin Lakes1.3 MGD (million gallons per day)2022
KIEL STPKiel1.29 MGD (million gallons per day)2022
COLUMBUS WWTPColumbus1.26 MGD (million gallons per day)2022
WHITEHALL WWTPWhitehall1.2 MGD (million gallons per day)2022
MAYVILLE STPMayville1.12 MGD (million gallons per day)2022
MAUSTON STPMauston1.05 MGD (million gallons per day)2022
SILVER LAKE SD STPSilver Lake1.025 MGD (million gallons per day)2022
ALGOMA WWTPAlgoma1 MGD (million gallons per day)2022
BELOIT, Town of - STPBeloit1 MGD (million gallons per day)2022
LAKE MILLS WWTPLake Mills0.98 MGD (million gallons per day)2022
NEW RICHMOND STPNew Richmond0.98 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.