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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
Calistoga WWTPCalistoga0.7 MGD (million gallons per day)2022
Lake Wildwood WWTPPenn Valley0.69 MGD (million gallons per day)2022
Oakmont WWTPSanta Rosa0.65 MGD (million gallons per day)2022
BUELLTON WWTFBuellton0.65 MGD (million gallons per day)2022
RIO VISTA WWTFRio Vista0.65 MGD (million gallons per day)2022
NEVADA CITY WWTFNevada City0.64 MGD (million gallons per day)2022
IVANHOE WWTFIvanhoe0.63 MGD (million gallons per day)2022
WHEATLAND WWTFWheatland0.62 MGD (million gallons per day)2022
MARIPOSA WWTFMariposa0.61 MGD (million gallons per day)2022
HURON WWTFHuron0.6 MGD (million gallons per day)2022
ANGELS CAMP WWTFAngels Camp0.6 MGD (million gallons per day)2022
RUNNING SPRINGS WWTFRunning Springs0.6 MGD (million gallons per day)2022
DOS PALOS STPDos Palos0.58 MGD (million gallons per day)2022
West Point STPSan Andreas0.58 MGD (million gallons per day)2022
DELHI STPDelhi0.58 MGD (million gallons per day)2022
Ferndale WWTFFerndale0.55 MGD (million gallons per day)2022
YOUNTVILLE-VETERANS WWTFYountville0.55 MGD (million gallons per day)2022
IONE WWTFIone0.55 MGD (million gallons per day)2022
LAKEPORT SOUTH WWTFLakeport0.55 MGD (million gallons per day)2022
Planada WWTFPlanada0.53 MGD (million gallons per day)2022
MCFARLAND WWTFMc Farland0.51 MGD (million gallons per day)2022
Horsethief Canyon WRFCorona0.5 MGD (million gallons per day)2022
Waterford, City ofWaterford0.5 MGD (million gallons per day)2022
WEAVERVILLE WWTFWeaverville0.5 MGD (million gallons per day)2022
ST. HELENA WWTFSaint Helena0.5 MGD (million gallons per day)2022
MALIBU WWTFMalibu0.5 MGD (million gallons per day)2022
New Piru WWTFVentura0.5 MGD (million gallons per day)2022
PORTOLA WWTFPortola0.5 MGD (million gallons per day)2022
Williams WWTFWilliams0.5 MGD (million gallons per day)2022
BASS LAKE WWTFBass Lake0.5 MGD (million gallons per day)2022
FIREBAUGH WWTFFirebaugh0.5 MGD (million gallons per day)2022
BEAR VALLEY WWTFArnold0.5 MGD (million gallons per day)2022
WOODBRIDGE WWTFWoodbridge0.5 MGD (million gallons per day)2022
Colfax WWTFColfax0.5 MGD (million gallons per day)2022
Alturas WWTPAlturas0.5 MGD (million gallons per day)2022
ARBUCKLE WWTFArbuckle0.5 MGD (million gallons per day)2022
CHESTER WWTFChester0.5 MGD (million gallons per day)2022
CLEARLAKE OAKS WWTFClearlake Oaks0.5 MGD (million gallons per day)2022
HAMILTON CITY WWTFHamilton City0.5 MGD (million gallons per day)2022
PIXLEY WWTFPixley0.5 MGD (million gallons per day)2022
Stallion Springs CSD WWTFTehachapi0.5 MGD (million gallons per day)2022
Lower Moosa Canyon WRFEscondido0.5 MGD (million gallons per day)2022
ISLETON WWTFIsleton0.49 MGD (million gallons per day)2022
SUTTER CREEK WWTFSutter Creek0.48 MGD (million gallons per day)2022
MURPHYS WWTFMurphys0.45 MGD (million gallons per day)2022
HOUSTON CREEK WWTFCrestline0.45 MGD (million gallons per day)2022
Rancho Santa Fe WWTFRancho Santa Fe0.45 MGD (million gallons per day)2022
Cottonwood WWTPCottonwood0.43 MGD (million gallons per day)2022
LOST HILLS WWTFLost Hills0.41 MGD (million gallons per day)2022
RIO DELL WWTFRio Dell0.4 MGD (million gallons per day)2022
Heritage Ranch Sewer Treatm PlantPaso Robles0.4 MGD (million gallons per day)2022
FRANKLIN WWTFMerced0.4 MGD (million gallons per day)2022
San Andreas Sanitary District WWTPSan Andreas0.4 MGD (million gallons per day)2022
Strathmore WWTFPorterville0.4 MGD (million gallons per day)2022
Tipton WWTFTipton0.4 MGD (million gallons per day)2022
Whispering Palms WPCFRancho Santa Fe0.4 MGD (million gallons per day)2022
SALIDA TRTMNT PLANTSalida0.39 MGD (million gallons per day)2022
BIGGS WWTFGridley0.38 MGD (million gallons per day)2022
WESTMORLAND WWTFWestmorland0.375 MGD (million gallons per day)2022
JUNE LAKE WWTFJune Lake0.37 MGD (million gallons per day)2022
MONTALVO WWTFVentura0.36 MGD (million gallons per day)2022
MOJAVE WWTFMojave0.36 MGD (million gallons per day)2022
BODEGA BAY WWTFBodega0.355 MGD (million gallons per day)2022
RIDGEMARK WWTFHollister0.35 MGD (million gallons per day)2022
WESTWOOD WWTFRancho Cordova0.35 MGD (million gallons per day)2022
HIDDEN VALLEY LAKE WWTFHidden Valley Lake0.35 MGD (million gallons per day)2022
POPLAR WWTFPorterville0.34 MGD (million gallons per day)2022
Maxwell WWTPMaxwell0.332 MGD (million gallons per day)2022
Woodville WWTFTulare0.33 MGD (million gallons per day)2022
NYELAND ACRES WWTFOxnard0.32 MGD (million gallons per day)2022
Mendocino City WWTFMendocino0.31 MGD (million gallons per day)2022
RANCHO DEL CAMPO WWTFSan Diego0.31 MGD (million gallons per day)2022
Summerland WWTPSummerland0.3 MGD (million gallons per day)2022
DEL REY WWTFDel Rey0.3 MGD (million gallons per day)2022
DUNSMUIR WWTFDunsmuir0.3 MGD (million gallons per day)2022
LONDON WWTFDinuba0.3 MGD (million gallons per day)2022
TERRA BELLA WWTFTerra Bella0.3 MGD (million gallons per day)2022
JAMESTOWN WWTFJamestown0.28 MGD (million gallons per day)2022
Shelter Cove WWTFWhitethorn0.27 MGD (million gallons per day)2022
SAN JUAN BAUTISTA WWTFSan Juan Bautista0.27 MGD (million gallons per day)2022
Saticoy SD Sewage Treatment PlantVentura0.25 MGD (million gallons per day)2022
Crossroads Wastewater Treatment PlantLathrop0.25 MGD (million gallons per day)2022
OAKHURST WWTFOakhurst0.25 MGD (million gallons per day)2022
McCloud WWTFMccloud0.25 MGD (million gallons per day)2022
SEELEY CWD WWTFSeeley0.25 MGD (million gallons per day)2022
Borrego Springs WWRFBorrego Springs0.25 MGD (million gallons per day)2022
MONTAGUE WWTFMontague0.24 MGD (million gallons per day)2022
WEED WWTFWeed0.227 MGD (million gallons per day)2022
RICHGROVE WWTFRichgrove0.22 MGD (million gallons per day)2022
KETTLEMAN CITY STPKettleman City0.22 MGD (million gallons per day)2022
BRIDGEPORT WWTFBridgeport0.21 MGD (million gallons per day)2022
SAN MIGUEL STPSan Miguel0.2 MGD (million gallons per day)2022
SAN SIMEON ACRES WWTFSan Simeon0.2 MGD (million gallons per day)2022
Boulder Creek WWTFSanta Cruz0.2 MGD (million gallons per day)2022
AVILA BEACH WWTFAvila Beach0.2 MGD (million gallons per day)2022
LACSD (La Canada WRP)La Canada Flintridge0.2 MGD (million gallons per day)2022
Copper Cove STPSan Andreas0.2 MGD (million gallons per day)2022
LATON WWTPLaton0.2 MGD (million gallons per day)2022
DESERT LAKE WWTFBoron0.2 MGD (million gallons per day)2022
DESERT SHORES WWTFSalton City0.2 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.