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

Wastewater treatment plants in United States · California

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510 inventory records · EPA Clean Watersheds Needs Survey 2022

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

510 results

CompareNameNative sizeYear
Manteca WQCFManteca9.87 MGD (million gallons per day)2022
Goleta Sanitary District Water Resource Recovery FacilityGoleta9.8 MGD (million gallons per day)2022
Tahoe-Truckee WWTPTruckee9.6 MGD (million gallons per day)2022
Redlands WWRFRedlands9.5 MGD (million gallons per day)2022
South County Regional Wastewater Treatment and Reclamation FacilityGilroy9 MGD (million gallons per day)2022
Santa Margarita Water District (Chiquita WRP)San Juan Capistrano9 MGD (million gallons per day)2022
Clear Creek WWTFAnderson8.8 MGD (million gallons per day)2022
ELK RIVER WWTFEureka8.6 MGD (million gallons per day)2022
Livermore WRPLivermore8.5 MGD (million gallons per day)2022
Lodi WPCFLodi8.5 MGD (million gallons per day)2022
Paradise, Town ofMagalia8.4 MGD (million gallons per day)2022
Porterville, City ofPorterville8 MGD (million gallons per day)2022
Selma-Kingsburg-Fowler CSD WWTFKingsburg8 MGD (million gallons per day)2022
EL CENTRO WWTFEl Centro8 MGD (million gallons per day)2022
Western Riverside Co Reg WWTPCorona8 MGD (million gallons per day)2022
Yucaipa Valley WD WWTPYucaipa8 MGD (million gallons per day)2022
Lake Elsinore Regional WWTPLake Elsinore8 MGD (million gallons per day)2022
4S Ranch Wastewater Treatment PlantSan Diego8 MGD (million gallons per day)2022
RIVERBANK WWTFRiverbank7.9 MGD (million gallons per day)2022
South Tahoe WWTFSouth Lake Tahoe7.7 MGD (million gallons per day)2022
OCWD Green Acres Project (GAP)Fountain Valley7.5 MGD (million gallons per day)2022
North of River Sanitary DistrictShafter7.5 MGD (million gallons per day)2022
Davis, City of WWTPDavis7.5 MGD (million gallons per day)2022
Irvine Ranch Water District (Los Alisos WRP)Lake Forest7.5 MGD (million gallons per day)2022
CAMARILLO Water Reclamation PlantCamarillo7.25 MGD (million gallons per day)2022
Delano WWTFDelano7.2 MGD (million gallons per day)2022
Calera Creek Water Recycling PlantPacifica7 MGD (million gallons per day)2022
Willits WWTFWillits7 MGD (million gallons per day)2022
Novato WWTFNovato7 MGD (million gallons per day)2022
MADERA STPMadera7 MGD (million gallons per day)2022
San Clemente, City of (Water Reclamation Plant)San Clemente7 MGD (million gallons per day)2022
Ellis Creek WRFPetaluma6.7 MGD (million gallons per day)2022
South Orange County Wastewater Authority (Coastal Treatment Plant)Laguna Niguel6.7 MGD (million gallons per day)2022
LACSD (Saugus WRP)Santa Clarita6.5 MGD (million gallons per day)2022
Sewerage Commis.-Oroville Reg. WWTPOroville6.5 MGD (million gallons per day)2022
SAUSALITO-MARIN CITY WWTFSausalito6 MGD (million gallons per day)2022
Atwater Regional Wastewater Treatment FacilityAtwater6 MGD (million gallons per day)2022
Hesperia WRP SystemHesperia6 MGD (million gallons per day)2022
East Valley Water DistrictSan Bernardino6 MGD (million gallons per day)2022
El Toro Water District (Water Reclamation Plant)Laguna Woods6 MGD (million gallons per day)2022
MNWD WWTP 3ALaguna Niguel6 MGD (million gallons per day)2022
LINCOLN WWTFLincoln5.9 MGD (million gallons per day)2022
Brawley WWTPBrawley5.9 MGD (million gallons per day)2022
Burlingame WWTPBurlingame5.5 MGD (million gallons per day)2022
SOLEDAD WWTFSoledad5.5 MGD (million gallons per day)2022
City of Lompoc WWTPLompoc5.5 MGD (million gallons per day)2022
Oceanside, City of (La Salina WWTF)Oceanside5.5 MGD (million gallons per day)2022
San Elijo WRFCardiff By The Sea5.25 MGD (million gallons per day)2022
San Luis Obispo WRFSan Luis Obispo5.1 MGD (million gallons per day)2022
Coachella Valley Water District (Water Reclamation Plant No. 7)Indio5 MGD (million gallons per day)2022
Santa Rosa WRFMurrieta5 MGD (million gallons per day)2022
SO SAN LUIS OB CO WWTFOceano5 MGD (million gallons per day)2022
HANFORD WWTFHanford5 MGD (million gallons per day)2022
TULARE WWTFTulare5 MGD (million gallons per day)2022
Brentwood WWTPBrentwood5 MGD (million gallons per day)2022
SONORA WWTPSonora5 MGD (million gallons per day)2022
LINDA WWTFMarysville5 MGD (million gallons per day)2022
Meadowlark Water Reclam. FacilitySan Marcos5 MGD (million gallons per day)2022
PASO ROBLES WWTPPaso Robles4.9 MGD (million gallons per day)2022
LOS BANOS WWTFLos Banos4.9 MGD (million gallons per day)2022
BIG BEAR AREA REG WWTFBig Bear City4.89 MGD (million gallons per day)2022
BENICIA WWTFBenicia4.5 MGD (million gallons per day)2022
Barstow WRFBarstow4.5 MGD (million gallons per day)2022
Coachella WWTPCoachella4.5 MGD (million gallons per day)2022
Ironhouse WRFOakley4.3 MGD (million gallons per day)2022
CALEXICO WWTFCalexico4.3 MGD (million gallons per day)2022
Pinole-Hercules Water Pollution Control PlantPinole4.06 MGD (million gallons per day)2022
Adelanto, City ofAdelanto4 MGD (million gallons per day)2022
Sewer Authority Mid-Coastside WWTFHalf Moon Bay4 MGD (million gallons per day)2022
El Dorado Hills WWTPEl Dorado Hills4 MGD (million gallons per day)2022
BEAUMONT WWTFBeaumont4 MGD (million gallons per day)2022
Stillwater WWTFAnderson3.8 MGD (million gallons per day)2022
CERES WWTPCeres3.73 MGD (million gallons per day)2022
Laguna CSD WWTFSanta Maria3.7 MGD (million gallons per day)2022
RIDGECREST WWTFRidgecrest3.6 MGD (million gallons per day)2022
SASM WWTFMill Valley3.6 MGD (million gallons per day)2022
S. MARIN SUBREG OUTFALLMill Valley3.6 MGD (million gallons per day)2022
Deer Creek WWTPShingle Springs3.6 MGD (million gallons per day)2022
BANNING WWTFBanning3.6 MGD (million gallons per day)2022
REEDLEY WWTPReedley3.5 MGD (million gallons per day)2022
MOUNTAIN VIEW WWTFMartinez3.2 MGD (million gallons per day)2022
Ukiah WWTFUkiah3.01 MGD (million gallons per day)2022
Western Water Recycling FacilityMarch Air Reserve Base3 MGD (million gallons per day)2022
MILLBRAE MADRONE WWTFMillbrae3 MGD (million gallons per day)2022
Sonoma Valley WWTFSonoma3 MGD (million gallons per day)2022
Carmel Area Wastewater Treatment PlantCarmel3 MGD (million gallons per day)2022
OJAI VALLEY SD WWTFVentura3 MGD (million gallons per day)2022
Moorpark WWTFMoorpark3 MGD (million gallons per day)2022
OLIVEHURST WWTFOlivehurst3 MGD (million gallons per day)2022
GALT WWTFGalt3 MGD (million gallons per day)2022
WASCO WWTFWasco3 MGD (million gallons per day)2022
DINUBA WWTFDinuba3 MGD (million gallons per day)2022
Corona WWTF #2Corona3 MGD (million gallons per day)2022
Santa Margarita Water District (Oso Creek WRP)Mission Viejo3 MGD (million gallons per day)2022
Las Gallinas Valley Sanitary District Sewage Treatment PlantSan Rafael2.92 MGD (million gallons per day)2022
Grass Valley WWTFGrass Valley2.78 MGD (million gallons per day)2022
FALLBROOK WWTF #1Fallbrook2.7 MGD (million gallons per day)2022
Hollister Domestic WWTPHollister2.69 MGD (million gallons per day)2022
Santa Paula WRFSanta Paula2.55 MGD (million gallons per day)2022
American Canyon WWTFAmerican Canyon2.5 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.