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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
POINT ARENA WWTFPoint Arena0.19 MGD (million gallons per day)2022
Forest Meadows STPMurphys0.189 MGD (million gallons per day)2022
BLUE LAKE WWTFBlue Lake0.18 MGD (million gallons per day)2022
Happy Camp WWTPHappy Camp0.18 MGD (million gallons per day)2022
Arnold STPSan Andreas0.17 MGD (million gallons per day)2022
GARBERVILLE WWTFGarberville0.162 MGD (million gallons per day)2022
TULELAKE STPTulelake0.16 MGD (million gallons per day)2022
LYTLE CREEK WWTFVictorville0.16 MGD (million gallons per day)2022
NEWELL WWTFTulelake0.156 MGD (million gallons per day)2022
CUYAMA WWTFNew Cuyama0.15 MGD (million gallons per day)2022
GROVELAND WWTFGroveland0.15 MGD (million gallons per day)2022
BUTTONWILLOW WWTFButtonwillow0.15 MGD (million gallons per day)2022
GRATON WWTFSebastopol0.14 MGD (million gallons per day)2022
MANILA WWTFSamoa0.14 MGD (million gallons per day)2022
LOYALTON WWTFLoyalton0.14 MGD (million gallons per day)2022
Lake Shastina WWTFWeed0.132 MGD (million gallons per day)2022
Gualala CSDGualala0.131 MGD (million gallons per day)2022
FORESTVILLE WWTFForestville0.13 MGD (million gallons per day)2022
Etna Wastewater Treatment FacilityEtna0.13 MGD (million gallons per day)2022
HOPLAND WWTFHopland0.121 MGD (million gallons per day)2022
DORRIS WWTFDorris0.12 MGD (million gallons per day)2022
LOLETA WWTFLoleta0.12 MGD (million gallons per day)2022
BIOLA WWTPBiola0.12 MGD (million gallons per day)2022
PAUMA VALLEY WWTFPauma Valley0.12 MGD (million gallons per day)2022
PLYMOUTH WWTFPlymouth0.11 MGD (million gallons per day)2022
KNIGHTS LANDING WWTFKnights Landing0.11 MGD (million gallons per day)2022
Fall River Mills Community Services District Wastewater Treatment FacilityFall River Mills0.1 MGD (million gallons per day)2022
GRAYSON WWTFPatterson0.1 MGD (million gallons per day)2022
Delleker WWTFBeckwourth0.1 MGD (million gallons per day)2022
Plumas Eureka WWTPBlairsden-graeagle0.1 MGD (million gallons per day)2022
BIEBER WWTFBieber0.1 MGD (million gallons per day)2022
Imperial Commun Colleges Dist WWTFImperial0.1 MGD (million gallons per day)2022
Covelo WWTPCovelo0.097 MGD (million gallons per day)2022
Geyserville WWTFGeyserville0.092 MGD (million gallons per day)2022
Hopland Band WWTPHopland0.09 MGD (million gallons per day)2022
SAN ARDO WWTFSan Ardo0.09 MGD (million gallons per day)2022
Sheridan WWTFSheridan0.09 MGD (million gallons per day)2022
Pfeiffer Big Sur WWTFBig Sur0.083 MGD (million gallons per day)2022
Yosemite West WWTFMariposa0.083 MGD (million gallons per day)2022
CHUALAR TREATMENT PONDSSoledad0.08 MGD (million gallons per day)2022
BYRON SAN DIS WWTFByron0.08 MGD (million gallons per day)2022
RICHVALE WWTFRichvale0.08 MGD (million gallons per day)2022
HILTON CREEK WWTFMammoth Lakes0.08 MGD (million gallons per day)2022
RIPLEY WWTFPalo Verde0.08 MGD (million gallons per day)2022
Leavitt Lake Evaporation PondsSusanville0.072 MGD (million gallons per day)2022
Mineral Wastewater Treatment PlantMineral0.07 MGD (million gallons per day)2022
PALA RESERVATION LAGOONPala0.07 MGD (million gallons per day)2022
DON PEDRO WWTFLa Grange0.066 MGD (million gallons per day)2022
BOLINAS WWTFBolinas0.065 MGD (million gallons per day)2022
Vallecito/Douglas Flat WWTFDouglas Flat0.065 MGD (million gallons per day)2022
FORT JONES WWTFFort Jones0.063 MGD (million gallons per day)2022
Springville Public Utility DistrictSpringville0.06 MGD (million gallons per day)2022
OCEANA MARIN WWTFNovato0.06 MGD (million gallons per day)2022
TRES PINOS WWTFTres Pinos0.06 MGD (million gallons per day)2022
Snelling WWTFSnelling0.06 MGD (million gallons per day)2022
MOKELUMNE HILL WWTFMokelumne Hill0.06 MGD (million gallons per day)2022
Camino Heights Wastewater Treatment PlantPlacerville0.06 MGD (million gallons per day)2022
Blythe Airport WWTFBlythe0.05 MGD (million gallons per day)2022
Pine Valley WWTFSan Diego0.05 MGD (million gallons per day)2022
MIRANDA WWTFMiranda0.046 MGD (million gallons per day)2022
Lake Berryessa Resort Improvement DistrictMiddletown0.042 MGD (million gallons per day)2022
Skyline Ranch Country Club WWTFValley Center0.042 MGD (million gallons per day)2022
CALPELLA WWTPCalpella0.04 MGD (million gallons per day)2022
Sea Ranch WWTFSanta Rosa0.04 MGD (million gallons per day)2022
Tomales WWTPTomales0.04 MGD (million gallons per day)2022
PARADISE COVE WWTFBelvedere Tiburon0.04 MGD (million gallons per day)2022
Reeder Tract WWTFLake Isabella0.04 MGD (million gallons per day)2022
LOG CABIN RANCH WWTFSan Francisco0.036 MGD (million gallons per day)2022
Port Costa WWTFPort Costa0.033 MGD (million gallons per day)2022
Markleeville Public Utility DistrictMarkleeville0.03 MGD (million gallons per day)2022
MOTHER LODE WWTFArnold0.03 MGD (million gallons per day)2022
Westport STFWestport0.029 MGD (million gallons per day)2022
Cascade Shores WWTPNevada City0.026 MGD (million gallons per day)2022
COULTERVILLE WWTFCoulterville0.025 MGD (million gallons per day)2022
Klamath Community Services DistrictKlamath0.023 MGD (million gallons per day)2022
Julian Water Pollution Control Fac.Julian0.023 MGD (million gallons per day)2022
Six Mile Village WWTFWilseyville0.02 MGD (million gallons per day)2022
BECKWOURTH WWTFQuincy0.02 MGD (million gallons per day)2022
LEMON COVE WWTFLemon Cove0.02 MGD (million gallons per day)2022
ANCHOR BAY WWTFGualala0.01 MGD (million gallons per day)2022
BEAR CREEK ESTATES WWTFBoulder Creek0.01 MGD (million gallons per day)2022
Wilseyville STPWilseyville0.009 MGD (million gallons per day)2022
Lake Cachuma County Park WWTFSanta Barbara0.006 MGD (million gallons per day)2022
Mariposa Pines WWTFMariposa0.004 MGD (million gallons per day)2022
Occidental WWTFCWNS2022_06001017001Not reported MGD (million gallons per day)Not reported
REDWAY WWTFCWNS2022_06001019001Not reported MGD (million gallons per day)Not reported
Russian River County WWTFCWNS2022_06001029001Not reported MGD (million gallons per day)Not reported
SONOMA CO AIRPORT WWTFCWNS2022_06001031001Not reported MGD (million gallons per day)Not reported
North Point WPCPSan FranciscoNot reported MGD (million gallons per day)2022
ATASCADERO ST HOSP WWTFCWNS2022_06003051001Not reported MGD (million gallons per day)Not reported
Oak Shores WWTFCWNS2022_06003071001Not reported MGD (million gallons per day)Not reported
BIG BASIN ST PK WWTFCWNS2022_06003100001Not reported MGD (million gallons per day)Not reported
GORMAN WWTFCWNS2022_06004008001Not reported MGD (million gallons per day)Not reported
WARM SPRINGS REHAB WWTFCWNS2022_06004008002Not reported MGD (million gallons per day)Not reported
TRANCAS WWTFCWNS2022_06004008003Not reported MGD (million gallons per day)Not reported
MILLER-KILPATRICK WWTFCWNS2022_06004008012Not reported MGD (million gallons per day)Not reported
MUNTZ-MENDENHALL WWTFCWNS2022_06004008014Not reported MGD (million gallons per day)Not reported
PAIGE-AFFLERBAUGH WWTFCWNS2022_06004008016Not reported MGD (million gallons per day)Not reported
DISCOVERY BAY WWTFCWNS2022_06005020001Not reported MGD (million gallons per day)Not reported
TRANQUILLITY WWTFCWNS2022_06005036001Not reported MGD (million gallons per day)Not reported

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.