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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
PATTERSON WWTFPatterson2.5 MGD (million gallons per day)2022
LEMOORE STPLemoore2.5 MGD (million gallons per day)2022
RED BLUFF WWTFRed Bluff2.5 MGD (million gallons per day)2022
Alan Horton WWTFDesert Hot Springs2.5 MGD (million gallons per day)2022
OAKDALE WWTFOakdale2.45 MGD (million gallons per day)2022
IMPERIAL WWTFImperial2.4 MGD (million gallons per day)2022
Morro Bay Cayucos WWTFMorro Bay2.36 MGD (million gallons per day)2022
Town of Discovery Bay (Plant 2)Discovery Bay2.35 MGD (million gallons per day)2022
Town of Discovery Bay (Plant 1)Discovery Bay2.35 MGD (million gallons per day)2022
Arcata WWTFArcata2.3 MGD (million gallons per day)2022
L. ARROWHEAD WWTFLake Arrowhead2.3 MGD (million gallons per day)2022
WINDSOR WWTFWindsor2.25 MGD (million gallons per day)2022
S.F. International Airport WQCPSan Francisco2.2 MGD (million gallons per day)2022
Malaga WWTFFresno2.2 MGD (million gallons per day)2022
Mammoth Community WWTFMammoth Lakes2.2 MGD (million gallons per day)2022
ORLAND WWTFOrland2.1 MGD (million gallons per day)2022
Treasure Island WWTFSan Francisco2 MGD (million gallons per day)2022
Carpinteria WWTFCarpinteria2 MGD (million gallons per day)2022
Anderson WWTFAnderson2 MGD (million gallons per day)2022
LAKE CO NW REG WWTPLakeport2 MGD (million gallons per day)2022
Parlier WWTFParlier2 MGD (million gallons per day)2022
Cutler-Orosi WWTFCutler2 MGD (million gallons per day)2022
Lamont WWTFLamont2 MGD (million gallons per day)2022
LIVINGSTON DOMESTIC STPLivingston2 MGD (million gallons per day)2022
SUSANVILLE REG WWTFSusanville2 MGD (million gallons per day)2022
Padre Dam WRFSantee2 MGD (million gallons per day)2022
Pismo Beach, City of (Collection & WWTF)Pismo Beach1.9 MGD (million gallons per day)2022
Crescent City WWTFCrescent City1.86 MGD (million gallons per day)2022
FILLMORE WWTFFillmore1.8 MGD (million gallons per day)2022
Chowchilla WWTPChowchilla1.8 MGD (million gallons per day)2022
Hughson WWTFHughson1.8 MGD (million gallons per day)2022
Corcoran WWTFCorcoran1.75 MGD (million gallons per day)2022
CALIPATRIA WWTFCalipatria1.73 MGD (million gallons per day)2022
Gridley Wastewater Treatment PlantGridley1.7 MGD (million gallons per day)2022
Marysville WWTFMarysville1.7 MGD (million gallons per day)2022
AUBURN WWTFAuburn1.67 MGD (million gallons per day)2022
Sanger WWTFSanger1.6 MGD (million gallons per day)2022
WINTERS WWTFWinters1.6 MGD (million gallons per day)2022
QUINCY TREATMENT PLANTQuincy1.6 MGD (million gallons per day)2022
Hangtown Creek WWTPPlacerville1.6 MGD (million gallons per day)2022
Temescal Valley WD WWTPCorona1.58 MGD (million gallons per day)2022
FORTUNA WWTFFortuna1.5 MGD (million gallons per day)2022
SCOTTS VALLEY WWTFScotts Valley1.5 MGD (million gallons per day)2022
SOLVANG WWTFSolvang1.5 MGD (million gallons per day)2022
TAFT WWTFTaft1.5 MGD (million gallons per day)2022
HEALDSBURG WWTFHealdsburg1.4 MGD (million gallons per day)2022
ATASCADERO WWTFAtascadero1.4 MGD (million gallons per day)2022
Live Oak WWTPLive Oak1.4 MGD (million gallons per day)2022
DIXON WWTFDixon1.4 MGD (million gallons per day)2022
Corning WWTPCorning1.4 MGD (million gallons per day)2022
MCKINLEYVILLE WWTFMckinleyville1.37 MGD (million gallons per day)2022
COALINGA WWTFCoalinga1.34 MGD (million gallons per day)2022
SHASTA LAKE WWTFShasta Lake1.3 MGD (million gallons per day)2022
Railroad Canyon WWTPLake Elsinore1.3 MGD (million gallons per day)2022
Ralph W. Chapman WRFSpring Valley1.3 MGD (million gallons per day)2022
Rosamond WWTFRosamond1.27 MGD (million gallons per day)2022
EARLIMART WWTFEarlimart1.25 MGD (million gallons per day)2022
ESCALON WWTFEscalon1.25 MGD (million gallons per day)2022
NEWMAN WWTFNewman1.25 MGD (million gallons per day)2022
C & H SUGAR JOINT WWTPCrockett1.2 MGD (million gallons per day)2022
AVALON WWRFAvalon1.2 MGD (million gallons per day)2022
KERMAN WWTFKerman1.2 MGD (million gallons per day)2022
WILLOWS WWTFWillows1.2 MGD (million gallons per day)2022
Silver Lakes WWTFHelendale1.2 MGD (million gallons per day)2022
NEEDLES WWTFNeedles1.2 MGD (million gallons per day)2022
Gustine WWTFGustine1.18 MGD (million gallons per day)2022
RODEO WWTFRodeo1.14 MGD (million gallons per day)2022
Blythe Regional WWTFBlythe1.138 MGD (million gallons per day)2022
AVENAL WWTFAvenal1.11 MGD (million gallons per day)2022
Exeter WWTFExeter1.07 MGD (million gallons per day)2022
RIPON WWTFRipon1.069 MGD (million gallons per day)2022
North Fresno Wastewater Reclamation FacilityFresno1 MGD (million gallons per day)2022
Fort Bragg WWTPFort Bragg1 MGD (million gallons per day)2022
CLOVERDALE WWTFCloverdale1 MGD (million gallons per day)2022
Yreka WWTFYreka1 MGD (million gallons per day)2022
GREENFIELD WWTFGreenfield1 MGD (million gallons per day)2022
Cambria WQCPCambria1 MGD (million gallons per day)2022
MONTECITO WWTFSanta Barbara1 MGD (million gallons per day)2022
Lathrop Consolidated Treatment FacilityLathrop1 MGD (million gallons per day)2022
ORANGE COVE WWTFOrange Cove1 MGD (million gallons per day)2022
Woodlake WWTFWoodlake1 MGD (million gallons per day)2022
LINDSAY WWTFLindsay1 MGD (million gallons per day)2022
WATERFORD WWTPWaterford1 MGD (million gallons per day)2022
HILMAR W.T.P.Hilmar1 MGD (million gallons per day)2022
Hi Desert WWRFYucca Valley1 MGD (million gallons per day)2022
Corona WWTP #3Corona1 MGD (million gallons per day)2022
Gafner Water Recycling FacilityCarlsbad1 MGD (million gallons per day)2022
Marin Co. SD #5 WWTFBelvedere Tiburon0.98 MGD (million gallons per day)2022
GUADALUPE WWTFGuadalupe0.96 MGD (million gallons per day)2022
San Leandro, City of (WPCP)San Leandro0.95 MGD (million gallons per day)2022
LARKFIELD-WIKIUP WWTFSanta Rosa0.9 MGD (million gallons per day)2022
Colusa WWTPColusa0.9 MGD (million gallons per day)2022
HOLTVILLE WWTFHoltville0.85 MGD (million gallons per day)2022
DONNER SUMMIT WWTFSoda Springs0.82 MGD (million gallons per day)2022
HEBER WWTFHeber0.81 MGD (million gallons per day)2022
ARVIN WWTFArvin0.8 MGD (million gallons per day)2022
Mt. Shasta WWTFMount Shasta0.8 MGD (million gallons per day)2022
GONZALES WWTFGonzales0.763 MGD (million gallons per day)2022
Lake of the Pines WWTPAuburn0.72 MGD (million gallons per day)2022
JACKSON WWTFJackson0.71 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.