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

Wastewater treatment plants in United States · Montana

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163 inventory records · EPA Clean Watersheds Needs Survey 2022

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

163 results

CompareNameNative sizeYear
BILLINGS WWTPBillings26 MGD (million gallons per day)2022
GREAT FALLS WWTPGreat Falls21.1 MGD (million gallons per day)2022
MISSOULA WWTPMissoula12.5 MGD (million gallons per day)2022
BOZEMAN WWTPBozeman6 MGD (million gallons per day)2022
HELENA WWTPHelena6 MGD (million gallons per day)2022
BUTTE-SILVER BOW CITY-COUNTYButte4.61 MGD (million gallons per day)2022
KALISPELL WWT FACILITYKalispell3.1 MGD (million gallons per day)2022
HAVRE WWTFHavre2.3 MGD (million gallons per day)2022
WHITEFISH WWTPWhitefish2.2 MGD (million gallons per day)2022
LIVINGSTON WWTPLivingston2 MGD (million gallons per day)2022
MILES CITY WWTPMiles City2 MGD (million gallons per day)2022
LEWISTOWN WWT FACILITYLewistown1.2 MGD (million gallons per day)2022
GLENDIVE WWT FACILITYGlendive1.1 MGD (million gallons per day)2022
BELGRADE LAGOONSBelgrade1 MGD (million gallons per day)2022
ANACONDA Deer Lodge CountyAnaconda1 MGD (million gallons per day)2022
DEER LODGE WWTPDeer Lodge1 MGD (million gallons per day)2022
HAMILTON WWTPHamilton1 MGD (million gallons per day)2022
LAUREL WWTPLaurel0.88 MGD (million gallons per day)2022
SIDNEY WWTFSidney0.8 MGD (million gallons per day)2022
DILLON WWTPDillon0.75 MGD (million gallons per day)2022
GLASGOW WWTFGlasgow0.7 MGD (million gallons per day)2022
RED LODGE, CITY OF - Combined SewerRed Lodge0.61 MGD (million gallons per day)2022
Four Corners WRFBozeman0.6 MGD (million gallons per day)2022
HARDIN WWT FACILITYHardin0.6 MGD (million gallons per day)2022
POPLAR WWTPPoplar0.6 MGD (million gallons per day)2022
COLSTRIP WWTPColstrip0.6 MGD (million gallons per day)2022
COLUMBIA FALLS WWTPColumbia Falls0.55 MGD (million gallons per day)2022
BIG TIMBER WWTFBig Timber0.523 MGD (million gallons per day)2022
LIBBY WWTPLibby0.511 MGD (million gallons per day)2022
FORSYTH WWTPForsyth0.5 MGD (million gallons per day)2022
POLSON WWTPPolson0.5 MGD (million gallons per day)2022
CUT BANK LAGOONCut Bank0.5 MGD (million gallons per day)2022
BIGFORK COUNTY WATER & SEWER DIS.Bigfork0.5 MGD (million gallons per day)2022
THREE FORKS STPThree Forks0.45 MGD (million gallons per day)2022
EAST HELENA WWTPEast Helena0.44 MGD (million gallons per day)2022
WOLF POINT WWTPWolf Point0.42 MGD (million gallons per day)2022
RAE County W&S DistrictBozeman0.4 MGD (million gallons per day)2022
MALTA WWTPMalta0.4 MGD (million gallons per day)2022
SHELBY WWTPShelby0.4 MGD (million gallons per day)2022
BIG SKY CO W&S DISTBig Sky0.4 MGD (million gallons per day)2022
Dawson County W Glendive WastewaterGlendive0.39 MGD (million gallons per day)2022
River Rock County W & S DistrictBelgrade0.374 MGD (million gallons per day)2022
BAKER, CITY OF - WWTPBaker0.348 MGD (million gallons per day)2022
Hobson WWTPHobson0.31 MGD (million gallons per day)2022
GARDINER WWTFGardiner0.302 MGD (million gallons per day)2022
CONRAD WWTPConrad0.3 MGD (million gallons per day)2022
STEVENSVILLE WWTPStevensville0.3 MGD (million gallons per day)2022
CHOTEAU LAGOONSChoteau0.3 MGD (million gallons per day)2022
PLENTYWOOD LAGOONPlentywood0.281 MGD (million gallons per day)2022
Columbus, City ofColumbus0.25 MGD (million gallons per day)2022
LOLO Water & Sewer DistrictLolo0.25 MGD (million gallons per day)2022
LAKESIDE STPLakeside0.241 MGD (million gallons per day)2022
HARLOWTON LAGOONHarlowton0.215 MGD (million gallons per day)2022
EUREKA LAGOONSEureka0.21 MGD (million gallons per day)2022
RONAN LAGOONRonan0.202 MGD (million gallons per day)2022
TOWNSEND LAGOONTownsend0.2 MGD (million gallons per day)2022
MANHATTAN WWTPManhattan0.194 MGD (million gallons per day)2022
SUN PRAIRIE VILLAGE W&S DISTRICTGreat Falls0.182 MGD (million gallons per day)2022
SUPERIOR WWTPSuperior0.18 MGD (million gallons per day)2022
BIG SANDY WWTPBig Sandy0.18 MGD (million gallons per day)2022
ABSAROKEE SEWER DIST RSID 5&7 WWTPAbsarokee0.175 MGD (million gallons per day)2022
FORT BENTON LAGOONSFort Benton0.161 MGD (million gallons per day)2022
CIRCLE LAGOONCircle0.16 MGD (million gallons per day)2022
BOULDER WWTPBoulder0.159 MGD (million gallons per day)2022
BELT WWTPBelt0.155 MGD (million gallons per day)2022
ENNIS WWTPEnnis0.15 MGD (million gallons per day)2022
WHITEHALL WWTPWhitehall0.15 MGD (million gallons per day)2022
TROY LAGOONTroy0.145 MGD (million gallons per day)2022
MT Dept of CorrectionsDeer Lodge0.14 MGD (million gallons per day)2022
Park City W&S DistrictPark City0.136 MGD (million gallons per day)2022
West Yellowstone WWTPWest Yellowstone0.13 MGD (million gallons per day)2022
SHERIDAN WWTPSheridan0.13 MGD (million gallons per day)2022
BRIDGER LAGOONSBridger0.124 MGD (million gallons per day)2022
HARLEM WWTPHarlem0.11 MGD (million gallons per day)2022
PHILIPSBURG WWTPPhilipsburg0.11 MGD (million gallons per day)2022
FAIRFIELD WWTFFairfield0.1 MGD (million gallons per day)2022
SCOBEY WWTPScobey0.1 MGD (million gallons per day)2022
WHITE SULPHUR SPRINGS STPWhite Sulphur Springs0.1 MGD (million gallons per day)2022
CULBERTSON WWTPCulbertson0.1 MGD (million gallons per day)2022
WIBAUX WWTPWibaux0.1 MGD (million gallons per day)2022
HOT SPRINGS WWTFHot Springs0.1 MGD (million gallons per day)2022
TREASURE STATE ACRES SEWER DIST.Helena0.1 MGD (million gallons per day)2022
Victor County W&S DistrictVictor0.09 MGD (million gallons per day)2022
VAUGHN COUNTY W&S DISTRICTVaughn0.09 MGD (million gallons per day)2022
ARLEEArlee0.09 MGD (million gallons per day)2022
ST. IGNATIUS WWTPSaint Ignatius0.086 MGD (million gallons per day)2022
CASCADE WWTFCascade0.083 MGD (million gallons per day)2022
Chester WWTPChester0.08 MGD (million gallons per day)2022
Corvallis WastewaterCorvallis0.08 MGD (million gallons per day)2022
Town of FairviewFairview0.08 MGD (million gallons per day)2022
JORDAN WWTPJordan0.08 MGD (million gallons per day)2022
BIG MOUNTAIN SEWER DISTRICTWhitefish0.08 MGD (million gallons per day)2022
AMSTERDAM/CHURCHILL CTY W & S DIST.Manhattan0.078 MGD (million gallons per day)2022
Tenmile-Pleasant Valley Sewer District WWTFHelena0.076 MGD (million gallons per day)2022
TWIN BRIDGES WWTPTwin Bridges0.07 MGD (million gallons per day)2022
CHINOOK WWTPChinook0.07 MGD (million gallons per day)2022
THOMPSON FALLS - TOWN OF - WWTPThompson Falls0.067 MGD (million gallons per day)2022
EKALAKA WWTPEkalaka0.066 MGD (million gallons per day)2022
ASHLAND LAGOONSAshland0.063 MGD (million gallons per day)2022
FROMBERG - TOWN OFFromberg0.06 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.