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

Wastewater treatment plants in United States · Idaho

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184 inventory records · EPA Clean Watersheds Needs Survey 2022

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

184 results

CompareNameNative sizeYear
FISH HAVEN AREA REC WW SYSTEMParis0.16 MGD (million gallons per day)2022
PLUMMER S/T PLANTPlummer0.16 MGD (million gallons per day)2022
FRANKLIN S/T FACILITYFranklin0.156 MGD (million gallons per day)2022
RIGGINS SEWAGE TREATMENT FACILITYRiggins0.155 MGD (million gallons per day)2022
TROY S/T FACILITYTroy0.15 MGD (million gallons per day)2022
LAPWAI S/T FACILITYLapwai0.15 MGD (million gallons per day)2022
WILDER SEWAGE LAGOONWilder0.15 MGD (million gallons per day)2022
HAZELTON STPHazelton0.136 MGD (million gallons per day)2022
Challis Cyprus Lagoon SystemChallis0.135 MGD (million gallons per day)2022
HANSEN STPHansen0.125 MGD (million gallons per day)2022
N Idaho Correctional Facility STPCottonwood0.12 MGD (million gallons per day)2022
ELK CITY SEWAGE TREATMENT SYSTEMElk City0.12 MGD (million gallons per day)2022
PARIS SEWAGE LAGOONParis0.11 MGD (million gallons per day)2022
INKOM S/T FACILITYInkom0.11 MGD (million gallons per day)2022
FT HALL S/T FACILITYFort Hall0.103 MGD (million gallons per day)2022
HEYBURN STATE PARK S/T FAPlummer0.101 MGD (million gallons per day)2022
NEZ PERCE SEWAGE LAGOONNezperce0.1 MGD (million gallons per day)2022
Carey Wastewater FaciltyCarey0.1 MGD (million gallons per day)2022
THE MEADOWS LLCKetchum0.1 MGD (million gallons per day)2022
ROBERTS S/T FACILITYRoberts0.1 MGD (million gallons per day)2022
Housing Authority-City of CaldwellCaldwell0.087 MGD (million gallons per day)2022
OUTLET BAY S/T PLANTPriest River0.08 MGD (million gallons per day)2022
ELK RIVER STPElk River0.08 MGD (million gallons per day)2022
JULIAETTA STPJuliaetta0.08 MGD (million gallons per day)2022
FIRTH S/T FACILITYFirth0.08 MGD (million gallons per day)2022
KIDD ISLAND BAY STPCoeur D Alene0.08 MGD (million gallons per day)2022
DOWNEY SEWAGE LAGOON SYSTEMDowney0.08 MGD (million gallons per day)2022
DUBOIS S/T FACILITYDubois0.078 MGD (million gallons per day)2022
Huckleberry Bay Sewage Treatmnt SysCoolin0.078 MGD (million gallons per day)2022
GRANITE CREEK-REEDER BAY STPNordman0.075 MGD (million gallons per day)2022
AHSAHKA STPAhsahka0.074 MGD (million gallons per day)2022
MELBA STPMelba0.073 MGD (million gallons per day)2022
SOUTHSIDE SEWER SYSTEMSandpoint0.07 MGD (million gallons per day)2022
GEORGETOWN S/T FACILITYGeorgetown0.07 MGD (million gallons per day)2022
ELLISPORT BAY S/T FACILITYHope0.07 MGD (million gallons per day)2022
POTLATCH S/T FACILITYPotlatch0.067 MGD (million gallons per day)2022
BOVILL S/T FACILITYBovill0.065 MGD (million gallons per day)2022
CULDESAC S/T FACILITYCuldesac0.063 MGD (million gallons per day)2022
ROCKLAND SEWAGE TREATMENT SYSTEMRockland0.062 MGD (million gallons per day)2022
Carlin Bay Wastewater SystemHarrison0.06 MGD (million gallons per day)2022
NOTUS SEWAGE TREATMENT SYSTEMNotus0.06 MGD (million gallons per day)2022
LAST CHANCE/PONDS LODGE STPIsland Park0.06 MGD (million gallons per day)2022
DECLO STPDeclo0.06 MGD (million gallons per day)2022
DOVER S/T FACILITYDover0.06 MGD (million gallons per day)2022
RICHFIELD LAGOONSRichfield0.059 MGD (million gallons per day)2022
BASALT LAGOON/COLLECTION SYSTEMBasalt0.058 MGD (million gallons per day)2022
MUD LAKE STPTerreton0.058 MGD (million gallons per day)2022
TETONIA S/T FACILITYTetonia0.051 MGD (million gallons per day)2022
MOYIE SPRINGS S/T FACMoyie Springs0.05 MGD (million gallons per day)2022
ALBION SEWAGE TRT FACAlbion0.05 MGD (million gallons per day)2022
EDEN SEWAGE TRT FACEden0.05 MGD (million gallons per day)2022
BANCROFT SEWAGE LAGOONBancroft0.048 MGD (million gallons per day)2022
BOTTLE BAY S/T FACILITYSagle0.045 MGD (million gallons per day)2022
NEWDALE S/T FACILITYNewdale0.045 MGD (million gallons per day)2022
Grand View Sewage SystemGrand View0.045 MGD (million gallons per day)2022
MURTAUGH SEWAGE LAGOONSMurtaugh0.043 MGD (million gallons per day)2022
CASTLEFORD STPCastleford0.04 MGD (million gallons per day)2022
CAMBRIDGE SEWAGE LAGOONCambridge0.038 MGD (million gallons per day)2022
KALISPEL BAY STPNordman0.035 MGD (million gallons per day)2022
WINCHESTER S/T FACILITYWinchester0.035 MGD (million gallons per day)2022
HARRISON S/T FACILITYHarrison0.035 MGD (million gallons per day)2022
DIETRICH STPDietrich0.033 MGD (million gallons per day)2022
TENSED W/W TREATMENT FACTensed0.03 MGD (million gallons per day)2022
WHITE BIRD SEWAGE TREATMENT SYSTEMWhite Bird0.03 MGD (million gallons per day)2022
PRINCETON--HAMPTONPrinceton0.03 MGD (million gallons per day)2022
Bliss Sewage LagoonsBliss0.03 MGD (million gallons per day)2022
BRUNEAU S/T FACILITYBruneau0.023 MGD (million gallons per day)2022
Elk Bend Sewer SystemLewisville0.022 MGD (million gallons per day)2022
FERDINAND S/T FACILITYFerdinand0.022 MGD (million gallons per day)2022
Hoodoo Harvard Wastewater SystemHarvard0.021 MGD (million gallons per day)2022
NORTH TOMER BUTTE LAGOONMoscow0.021 MGD (million gallons per day)2022
GARFIELD BAY SEWER SYSTEMSagle0.02 MGD (million gallons per day)2022
RAPID RIVER SEWAGE TREATMENT FACRiggins0.02 MGD (million gallons per day)2022
BLOOMINGTON S/T FACILITYBloomington0.02 MGD (million gallons per day)2022
MOORE Water & Sewer AssociationMoore0.02 MGD (million gallons per day)2022
ROSWELL LSASParma0.02 MGD (million gallons per day)2022
South Park Utilities-Water & SewerShelley0.02 MGD (million gallons per day)2022
JOINT SCHOOL DIST 171-TIMBERLINE HS LSASWeippe0.015 MGD (million gallons per day)2022
Helmer Sewage Treatment SystemDeary0.014 MGD (million gallons per day)2022
REUBENS LSASReubens0.011 MGD (million gallons per day)2022
EMIDA LAGOON SYSTEMSaint Maries0.01 MGD (million gallons per day)2022
FENN S/T FACILITYFenn0.009 MGD (million gallons per day)2022
VIOLA S.T. FACILITIESViola0.009 MGD (million gallons per day)2022
Letha Sewage LagoonsLetha0.008 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.