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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
BOISE, CITY OF--WEST BOISEBoise17.5 MGD (million gallons per day)2022
IDAHO FALLS STPIdaho Falls17 MGD (million gallons per day)2022
NAMPA STPNampa14.1 MGD (million gallons per day)2022
S FRK COEUR D ALENE RVR SD-PAGESmelterville13 MGD (million gallons per day)2022
TWIN FALLS STPTwin Falls11.84 MGD (million gallons per day)2022
CALDWELL SEWAGE TRT FACILCaldwell10.64 MGD (million gallons per day)2022
BOISE, CITY OF- LANDER STREETBoise10.1 MGD (million gallons per day)2022
MERIDIAN STPMeridian9.3 MGD (million gallons per day)2022
POCATELLO STPPocatello8 MGD (million gallons per day)2022
KUNA NORTH WW TREATMENT PLANTKuna6.75 MGD (million gallons per day)2022
LEWISTON S/T PLANTLewiston5.71 MGD (million gallons per day)2022
EMMETT SEWAGE LAGOONEmmett5.7 MGD (million gallons per day)2022
SANDPOINT S/T PLANTSandpoint5 MGD (million gallons per day)2022
BURLEY SEWAGE TREATMENT PLANTBurley5 MGD (million gallons per day)2022
RUPERT STPRupert5 MGD (million gallons per day)2022
BLACKFOOT S/T FACILITY,Blackfoot5 MGD (million gallons per day)2022
COEUR D ALENE S/T PLANTCoeur D Alene4 MGD (million gallons per day)2022
JEROME STPJerome3.8 MGD (million gallons per day)2022
REXBURG TREATMENT FACILITYRexburg3.6 MGD (million gallons per day)2022
SALMON SEWAGE LAGOONSalmon3.35 MGD (million gallons per day)2022
POST FALLS AREA STPPost Falls3 MGD (million gallons per day)2022
MOUNTAIN HOME SEWAGE LAGOONMountain Home3 MGD (million gallons per day)2022
KETCHUM STPKetchum2.48 MGD (million gallons per day)2022
WEISER STPWeiser2.4 MGD (million gallons per day)2022
City of Burley Industrial ParkBurley2.4 MGD (million gallons per day)2022
EAGLE SEWER DistrictEagle2.3 MGD (million gallons per day)2022
PAYETTE STPPayette2.16 MGD (million gallons per day)2022
MCCALL SEWAGE LAGOONMccall2 MGD (million gallons per day)2022
HAYDEN AREA REGIONAL S/T FACILITYHayden2 MGD (million gallons per day)2022
SHELLEY S/T FACILITYShelley1.79 MGD (million gallons per day)2022
SODA SPRINGS WW TREAT FACSoda Springs1.76 MGD (million gallons per day)2022
Moscow Sewage Treatment PlantMoscow1.7 MGD (million gallons per day)2022
ST MARIES S/T LAGOONSaint Maries1.671 MGD (million gallons per day)2022
COUNCIL STPCouncil1.6 MGD (million gallons per day)2022
DRIGGS S/T FACILITYDriggs1.6 MGD (million gallons per day)2022
MIDDLETON SEWAGE TREATMENT FCLTYMiddleton1.5 MGD (million gallons per day)2022
HAILEY WOODSIDE S/T FACILITYHailey1.48 MGD (million gallons per day)2022
PRESTON S/T FACILITYPreston1.2 MGD (million gallons per day)2022
BUHL SEWAGE LAGOONBuhl1.14 MGD (million gallons per day)2022
GOODING STPGooding1 MGD (million gallons per day)2022
RIGBY STPRigby0.9 MGD (million gallons per day)2022
AMERICAN FALLS S/T FACILAmerican Falls0.9 MGD (million gallons per day)2022
Riverside Sewage Treatment PlantOrofino0.88 MGD (million gallons per day)2022
GRANGEVILLE S/T FACILITYGrangeville0.88 MGD (million gallons per day)2022
City of FruitlandFruitland0.85 MGD (million gallons per day)2022
CASCADE SEWAGE LAGOONCascade0.72 MGD (million gallons per day)2022
OROFINO S/T PLANTOrofino0.7 MGD (million gallons per day)2022
PARMA SEWAGE LAGOONParma0.68 MGD (million gallons per day)2022
ST ANTHONY SEWAGE LAGOONAshton0.67 MGD (million gallons per day)2022
S Frk Coeur D' Alene Rvr SD--MullanMullan0.6 MGD (million gallons per day)2022
NEW PLYMOUTH SEWAGE LAGOONNew Plymouth0.6 MGD (million gallons per day)2022
MALAD CITY STPMalad City0.59 MGD (million gallons per day)2022
Idaho City Rapid Infliltration BsnIdaho City0.56 MGD (million gallons per day)2022
WEIPPE S/T SystemWeippe0.536 MGD (million gallons per day)2022
KAMIAH REGIONAL STPKamiah0.504 MGD (million gallons per day)2022
MONTPELIER SEW TRT FACMontpelier0.5 MGD (million gallons per day)2022
BELLEVUE WW TREATMENT FACILITYBellevue0.5 MGD (million gallons per day)2022
HOMEDALE STPHomedale0.45 MGD (million gallons per day)2022
BONNERS FERRY S/T PLANTBonners Ferry0.45 MGD (million gallons per day)2022
GLENNS FERRY SEWAGE TREATGlenns Ferry0.44 MGD (million gallons per day)2022
MACKS INN-IS PK VILLAGE POTWMacks Inn0.403 MGD (million gallons per day)2022
PAUL SEWAGE TRT FACPaul0.38 MGD (million gallons per day)2022
HEYBURN STPHeyburn0.37 MGD (million gallons per day)2022
RIRIE SEWAGE LAGOONSRirie0.3 MGD (million gallons per day)2022
PIERCE S/T PLANTPierce0.3 MGD (million gallons per day)2022
MARSING SEWAGE LAGOONMarsing0.3 MGD (million gallons per day)2022
WENDELL SEWAGE TRT. FACWendell0.3 MGD (million gallons per day)2022
MENAN S/T FACILITYMenan0.29 MGD (million gallons per day)2022
ABERDEEN S/T FACILITYAberdeen0.283 MGD (million gallons per day)2022
ASHTON SEWAGE TREAT FACSaint Anthony0.28 MGD (million gallons per day)2022
KOOTENAI-PONDERAY SEWAGE/TRTMT FACSandpoint0.279 MGD (million gallons per day)2022
ARCO S/T FACILITYArco0.27 MGD (million gallons per day)2022
FILER STPFiler0.257 MGD (million gallons per day)2022
PRIEST RIVER STPPriest River0.25 MGD (million gallons per day)2022
Coolin S/T SystemCoolin0.25 MGD (million gallons per day)2022
SMELTERVILLE S/T FACILITYSmelterville0.25 MGD (million gallons per day)2022
GREENLEAF STPGreenleaf0.25 MGD (million gallons per day)2022
N Lake Rec Sewer & Water DistrictDonnelly0.237 MGD (million gallons per day)2022
BAYVIEW S/T PLANTBayview0.234 MGD (million gallons per day)2022
WORLEY S/T FACILITYWorley0.227 MGD (million gallons per day)2022
TWIN LAKES VILLAGE S/T FACILITYRathdrum0.216 MGD (million gallons per day)2022
COTTONWOOD STPCottonwood0.211 MGD (million gallons per day)2022
CHALLIS AIRPORT LAGOON SYSTEMChallis0.207 MGD (million gallons per day)2022
GRACE S/T FACILITYGrace0.206 MGD (million gallons per day)2022
SPIRIT LAKE TREATMENT FACILITYSpirit Lake0.204 MGD (million gallons per day)2022
LAVA HOT SPRINGS S/T FACILITYLava Hot Springs0.2 MGD (million gallons per day)2022
SANTA-FERNWOOD S/T FACILITYFernwood0.2 MGD (million gallons per day)2022
HORSESHOE BEND S/T FACILITYHorseshoe Bend0.2 MGD (million gallons per day)2022
HAGERMAN LAGOONHagerman0.2 MGD (million gallons per day)2022
SHOSHONE LAGOONShoshone0.2 MGD (million gallons per day)2022
STANLEY SEWER ASSOC. INCStanley0.199 MGD (million gallons per day)2022
KOOSKIA WTPKooskia0.198 MGD (million gallons per day)2022
GENESEE SEWAGE TRT FACILITYGenesee0.193 MGD (million gallons per day)2022
KENDRICK S/T FACILITYKendrick0.18 MGD (million gallons per day)2022
MCCAMMON S/T FACILITYMccammon0.18 MGD (million gallons per day)2022
MACKAY SEWAGE LAGOONMackay0.18 MGD (million gallons per day)2022
CRAIGMONT SEWAGE LAGOONCraigmont0.17 MGD (million gallons per day)2022
NEW MEADOWS S/T FACILITYNew Meadows0.17 MGD (million gallons per day)2022
FAIRFIELD S/T FACILITYFairfield0.165 MGD (million gallons per day)2022
DEARY S/T FACILITYDeary0.164 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.