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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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157 inventory records · HydroWASTE v1.0 / United States

Data years: 2012. The inventory date does not establish current operation.

157 results

CompareNameNative sizeYear
LaCasa Grande Water and Sewer DistrictHW:32633361 population served2012
Hill CountyHW:32631358 population served2012
FRAZER LAGOONHW:32590350 population served2012
DUTTON LAGOONHW:32578330 population served2012
RIVERSIDE WATER and SEWER DISTRICTHW:32618325 population served2012
AUGUSTA W and S DistrictHW:32558300 population served2012
GERALDINE TOWN OF WWTPHW:32504297 population served2012
SAVAGE WWTPHW:32588296 population served2012
RUDYARD WWTPHW:32555281 population served2012
HINSDALE WWTPHW:32596275 population served2012
RYEGATE WWTPHW:32550268 population served2012
RICHEY WWTPHW:32545259 population served2012
BELFRY LAGOONHW:32526250 population served2012
SACO WWTPHW:32565250 population served2012
BRADY WUA WWTPHW:32566250 population served2012
FORT PECK LAGOONSHW:32608250 population served2012
ROBERTS CARBON CO COMMHW:32615250 population served2012
South Wind Water and Sewer DistrictHW:32630240 population served2012
DRUMMOND WWTPHW:32551230 population served2012
FROID LAGOONHW:32570230 population served2012
WINIFRED WWTPHW:32505210 population served2012
BASIN WandS DISTRICTHW:32614210 population served2012
MOORE WWTPHW:32584193 population served2012
WILLOW CREEK SEWER DISTHW:32598192 population served2012
GILDFORD LAGOONHW:32592185 population served2012
WINNETT LAGOONSHW:32502182 population served2012
ALDER MADISON CSDHW:32609180 population served2012
Hebgen Lake Estates County WandS DistHW:32628168 population served2012
DIXONHW:32612160 population served2012
SEVILLE BLACKFEET IRHW:32625155 population served2012
BAINVILLE LAGOONSHW:32569153 population served2012
REXFORD LAGOONSHW:32503150 population served2012
CUSTER YELLOWSTONE COUNTY Sewer DistrictHW:32528150 population served2012
LAMBERT WWTPHW:32586150 population served2012
ST MARIE NO VALLEY CO WandS DISTHW:32606150 population served2012
DODSON TOWN OF WWTPHW:32507142 population served2012
WISDOM WWTPHW:32539135 population served2012
MELROSE COUNTY W and S DISTRICTHW:32601131 population served2012
GRASS RANGE WWTFHW:32547130 population served2012
STARR SCHOOL BLACKFEET IRHW:32623129 population served2012
MUDDY CLUSTER NCIRHW:32621125 population served2012
VIRGINIA CITY WWTPHW:32506120 population served2012
ANTELOPEHW:32600115 population served2012
BOX ELDER LAGOONSHW:32553108 population served2012
GOLDEN WEST MISSOULA COHW:32616105 population served2012
ROCKER WATER and SEWER DISTHW:32602100 population served2012
Ramsay Water and Sewer DistrictHW:32613100 population served2012
CHURCH SITE FORT KIPP FPIRHW:32622100 population served2012
Fallon County North Baker WastewaterHW:32635100 population served2012
ASHLAND RABBIT TOWN NCIRHW:3261995 population served2012
HAYS WWTFHW:3254275 population served2012
BEARCREEKHW:3250872 population served2012
Missoula County Spring MeadowHW:3263469 population served2012
BIRNEY N CHEYENNE INDIAN RESERVATIONHW:3262065 population served2012
JACKSONHW:3260343 population served2012
BABB BLACKFEET IRHW:3262424 population served2012
Bridger Pines County W and S DistrictHW:3262720 population served2012

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.