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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
JOLIET WWTPJoliet0.06 MGD (million gallons per day)2022
CHARLO - LAKE COUNTY SEWER DIST.Charlo0.06 MGD (million gallons per day)2022
ST. REGIS WWTPSaint Regis0.06 MGD (million gallons per day)2022
RYEGATE WWTPRyegate0.05 MGD (million gallons per day)2022
ROBERTS (CARBON CO. COMM)Roberts0.05 MGD (million gallons per day)2022
Wolf Creek WWTFWolf Creek0.05 MGD (million gallons per day)2022
RICHEY WWTPRichey0.047 MGD (million gallons per day)2022
ALBERTON LAGOONSAlberton0.046 MGD (million gallons per day)2022
DUTTON LAGOONDutton0.046 MGD (million gallons per day)2022
BASIN W&S DISTRICTBasin0.045 MGD (million gallons per day)2022
FRAZER LAGOONFrazer0.044 MGD (million gallons per day)2022
WINNETT LAGOONSWinnett0.04 MGD (million gallons per day)2022
DRUMMOND WWTPDrummond0.04 MGD (million gallons per day)2022
FROID LAGOONFroid0.04 MGD (million gallons per day)2022
GRASS RANGE WWTFGreat Falls0.038 MGD (million gallons per day)2022
AUGUSTA W & S DistrictAugusta0.036 MGD (million gallons per day)2022
BROCKTON LAGOONBrockton0.036 MGD (million gallons per day)2022
LaCasa Grande Water and Sewer DistrictEast Helena0.036 MGD (million gallons per day)2022
VALIER WWTPValier0.035 MGD (million gallons per day)2022
VIRGINIA CITY WWTPVirginia City0.033 MGD (million gallons per day)2022
DODSON, TOWN OF - WWTPDodson0.033 MGD (million gallons per day)2022
CUSTER - YELLOWSTONE COUNTY Sewer DistrictCuster0.032 MGD (million gallons per day)2022
NORTH CUT BANKCut Bank0.032 MGD (million gallons per day)2022
Denton, Town ofDenton0.03 MGD (million gallons per day)2022
GERALDINE, TOWN OF - WWTPGeraldine0.03 MGD (million gallons per day)2022
BELFRY LAGOONBelfry0.03 MGD (million gallons per day)2022
HYSHAM WWTPHysham0.03 MGD (million gallons per day)2022
BRADY WUA - WWTPBrady0.03 MGD (million gallons per day)2022
MOORE WWTPMoore0.03 MGD (million gallons per day)2022
SAVAGE WWTPSavage0.03 MGD (million gallons per day)2022
HINSDALE WWTPHinsdale0.03 MGD (million gallons per day)2022
WILLOW CREEK SEWER DIST.Willow Creek0.03 MGD (million gallons per day)2022
ALDER (MADISON CSD)Alder0.026 MGD (million gallons per day)2022
WISDOM WWTPWisdom0.025 MGD (million gallons per day)2022
FORT PECK LAGOONSFort Peck0.024 MGD (million gallons per day)2022
South Wind Water and Sewer DistrictGreat Falls0.024 MGD (million gallons per day)2022
Joplin Liberty County W&S DistrictJoplin0.02 MGD (million gallons per day)2022
REXFORD LAGOONSRexford0.02 MGD (million gallons per day)2022
WINIFRED WWTPWinifred0.02 MGD (million gallons per day)2022
RUDYARD WWTPRudyard0.02 MGD (million gallons per day)2022
BAINVILLE LAGOONSBainville0.02 MGD (million gallons per day)2022
GILDFORD LAGOONGildford0.02 MGD (million gallons per day)2022
ROCKER WATER & SEWER DIST.Butte0.02 MGD (million gallons per day)2022
ST. MARIE - NO VALLEY CO W&S DISTSaint Marie0.02 MGD (million gallons per day)2022
Ramsay Water and Sewer DistrictRamsay0.02 MGD (million gallons per day)2022
RIVERSIDE WATER & SEWER DISTRICTBozeman0.02 MGD (million gallons per day)2022
Fort Smith Water and Sewer DistrictHardin0.018 MGD (million gallons per day)2022
MELROSE COUNTY W & S DISTRICTMelrose0.017 MGD (million gallons per day)2022
DIXONDixon0.016 MGD (million gallons per day)2022
Power - Teton County W&S DistrictPower0.015 MGD (million gallons per day)2022
Yellowstone Boys & Girls Ranch County W&S DistrictBillings0.015 MGD (million gallons per day)2022
SACO WWTPSaco0.015 MGD (million gallons per day)2022
LAMBERT WWTPLambert0.015 MGD (million gallons per day)2022
ANTELOPEAntelope0.015 MGD (million gallons per day)2022
Hebgen Lake Estates County W&S DistWest Yellowstone0.012 MGD (million gallons per day)2022
Hingham WWTPHingham0.01 MGD (million gallons per day)2022
OPHEIM LAGOONSOpheim0.01 MGD (million gallons per day)2022
BEARCREEKBearcreek0.01 MGD (million gallons per day)2022
HAYS WWTFHays0.01 MGD (million gallons per day)2022
Craig County Water and Sewer DistrictWolf Creek0.01 MGD (million gallons per day)2022
Fallon County (North Baker) WastewaterBaker0.01 MGD (million gallons per day)2022
JACKSONJackson0.005 MGD (million gallons per day)2022
Bridger Pines County W & S DistrictBozeman0.002 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.