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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
Hyperion WRPPlaya Del Rey450 MGD (million gallons per day)2022
LACSD (Joint Water Pollution Control Plant)Carson400 MGD (million gallons per day)2022
Point Loma WRPSan Diego240 MGD (million gallons per day)2022
OCSD WRP No. 1Fountain Valley182 MGD (million gallons per day)2022
San Jose/Santa Clara WPCPSan Jose167 MGD (million gallons per day)2022
Oakport WWFOakland158 MGD (million gallons per day)2022
OCSD WWTP No. 2Huntington Beach150 MGD (million gallons per day)2022
East Bay MUD Main WWTPOakland120 MGD (million gallons per day)2022
Sacramento Regional County Sanitation District (Sacramento Regional Treatment Plant)Elk Grove115 MGD (million gallons per day)2022
OCWD Groundwater Replenishment System (GWRS)Fountain Valley100 MGD (million gallons per day)2022
Point Isabel WWFRichmond100 MGD (million gallons per day)2022
LACSD (San Jose Creek WRP)Whittier100 MGD (million gallons per day)2022
Southeast WPCPSan Francisco85.4 MGD (million gallons per day)2022
Tillman WRPVan Nuys80 MGD (million gallons per day)2022
Fresno-Clovis Regional WRFFresno68 MGD (million gallons per day)2022
Stockton Regional WWCFStockton55 MGD (million gallons per day)2022
Central Contra Costa WWTFMartinez53.8 MGD (million gallons per day)2022
San Antonio Creek WWFOakland51 MGD (million gallons per day)2022
Riverside, City of (Regional Water Quality Control Plant)Riverside46 MGD (million gallons per day)2022
IEUA Regional Plant No.1Ontario44 MGD (million gallons per day)2022
Oceanside WPCPSan Francisco43 MGD (million gallons per day)2022
Encina Water Pollution Control FacilityCarlsbad40.51 MGD (million gallons per day)2022
Regional Tertiary Treatment Rapid Infiltration and Extraction FacilityColton40 MGD (million gallons per day)2022
Palo Alto Regional WQCPPalo Alto39 MGD (million gallons per day)2022
LACSD (Los Coyotes WRP)Cerritos37.5 MGD (million gallons per day)2022
Union Sanitary District (Alvarado WWTF)Union City33 MGD (million gallons per day)2022
San Bernardino WRPSan Bernardino33 MGD (million gallons per day)2022
North City WRPSan Diego32 MGD (million gallons per day)2022
Oxnard WWTPOxnard31.7 MGD (million gallons per day)2022
Terminal Island WRPSan Pedro30 MGD (million gallons per day)2022
Perris Valley Regional WRFPerris30 MGD (million gallons per day)2022
Monterey One Water (Regional WWTP and Advanced Water Purification Facility)Marina29.6 MGD (million gallons per day)2022
Sunnyvale, City of (WPCP)Sunnyvale29.5 MGD (million gallons per day)2022
Silicon Valley Clean WaterRedwood City29 MGD (million gallons per day)2022
S BAYSIDE WWTPRedwood City29 MGD (million gallons per day)2022
Michelson WRPIrvine28 MGD (million gallons per day)2022
LACSD (Long Beach WRP)Long Beach25 MGD (million gallons per day)2022
Bakersfield WWTP #2Bakersfield25 MGD (million gallons per day)2022
Fairfield-Suisun Sewer DistrictFairfield23.7 MGD (million gallons per day)2022
Moreno Valley Regional WRFMoreno Valley22.5 MGD (million gallons per day)2022
Temecula Valley Regional WRFTemecula22.5 MGD (million gallons per day)2022
Visalia WWTPVisalia22 MGD (million gallons per day)2022
LACSD (Valencia WRP)Valencia21.6 MGD (million gallons per day)2022
Laguna Wastewater Treatment PlantSanta Rosa21.3 MGD (million gallons per day)2022
LACSD (Lancaster WRP)Lancaster21 MGD (million gallons per day)2022
Dublin-San Ramon WWTFPleasanton20.2 MGD (million gallons per day)2022
Oro Loma and Castro Valley Sanitary Districts (WPCP)San Lorenzo20 MGD (million gallons per day)2022
L.A.-Glendale WRPLos Angeles20 MGD (million gallons per day)2022
TURLOCK WWTFTurlock20 MGD (million gallons per day)2022
San Jacinto Regional WRFSan Jacinto20 MGD (million gallons per day)2022
Delta Diablo Wastewater Treatment PlantAntioch19.5 MGD (million gallons per day)2022
Advanced Water Purification FacilityOxnard18.75 MGD (million gallons per day)2022
Hayward, City of (WPCF)Hayward18.5 MGD (million gallons per day)2022
Dry Creek WWTPRoseville18 MGD (million gallons per day)2022
Victor Valley Regional WWRPVictorville18 MGD (million gallons per day)2022
South Bay WRPSan Diego18 MGD (million gallons per day)2022
Hale Avenue RRFEscondido18 MGD (million gallons per day)2022
City of Pleasanton CollectionsPleasanton17 MGD (million gallons per day)2022
SANTA CRUZ WWTFSanta Cruz17 MGD (million gallons per day)2022
Tapia Water Reclamation FacilityCalabasas16.1 MGD (million gallons per day)2022
Richmond Municipal Sewer District Water Pollution Control PlantRichmond16 MGD (million gallons per day)2022
Bakersfield WWTP #3Bakersfield16 MGD (million gallons per day)2022
San Mateo WWTFSan Mateo15.7 MGD (million gallons per day)2022
VSFCD WWTFVallejo15.5 MGD (million gallons per day)2022
Oceanside, City of (San Luis Rey WWTF)Oceanside15.5 MGD (million gallons per day)2022
NAPA SANIT. DIST WWRFNapa15.4 MGD (million gallons per day)2022
Coachella Valley Water District (Wastewater Reclamation Plant 10)Palm Desert15 MGD (million gallons per day)2022
LACSD (Pomona WRP)Pomona15 MGD (million gallons per day)2022
LACSD (Whittier Narrows WRP)El Monte15 MGD (million gallons per day)2022
Easterly Wastewater Treatment PlantElmira15 MGD (million gallons per day)2022
IEUA Regional Plant No.5Chino15 MGD (million gallons per day)2022
Modesto, City of (Jennings WWTF)Modesto14.9 MGD (million gallons per day)2022
Ventura Water Reclamation FacilityVentura14 MGD (million gallons per day)2022
Hill Canyon WWTPCamarillo14 MGD (million gallons per day)2022
IEUA Regional Plant No.4Rancho Cucamonga14 MGD (million gallons per day)2022
SANTA MARIA WWTFSanta Maria13.5 MGD (million gallons per day)2022
VALLEY SD WWTFIndio13.5 MGD (million gallons per day)2022
SO SF-SAN BRUNO WWTFSouth San Francisco13 MGD (million gallons per day)2022
South Orange County Wastewater Authority (Latham WWTP)Dana Point13 MGD (million gallons per day)2022
West County PlantRichmond12.5 MGD (million gallons per day)2022
Simi Valley WWTPSimi Valley12.5 MGD (million gallons per day)2022
South Orange County Wastewater Authority (Regional Treatment Plant)Laguna Niguel12 MGD (million gallons per day)2022
Watsonville WWTFWatsonville12 MGD (million gallons per day)2022
LACSD (Palmdale WRP)Palmdale12 MGD (million gallons per day)2022
Chico WPCPChico12 MGD (million gallons per day)2022
Merced WWTPMerced12 MGD (million gallons per day)2022
Pleasant Grove WWTPRoseville12 MGD (million gallons per day)2022
IEUA Carbon Canyon WRFChino12 MGD (million gallons per day)2022
Rialto WWTPBloomington11.7 MGD (million gallons per day)2022
Corona WWTF #1Corona11.5 MGD (million gallons per day)2022
El Estero Wastewater Treatment FacilitySanta Barbara11 MGD (million gallons per day)2022
Burbank WRPBurbank11 MGD (million gallons per day)2022
PALM SPRINGS WWRFPalm Springs10.9 MGD (million gallons per day)2022
Tracy WWTPTracy10.8 MGD (million gallons per day)2022
Yuba City WRPYuba City10.5 MGD (million gallons per day)2022
WOODLAND WWTFWoodland10.4 MGD (million gallons per day)2022
COLTON WWTFColton10.4 MGD (million gallons per day)2022
North San Mateo County Sanitation District WWTPDaly City10.3 MGD (million gallons per day)2022
Central Marin San. Agency WWTFSan Rafael10 MGD (million gallons per day)2022
Coachella Valley Water District (Mid-Valley Water Reclamation Plant No. 4)Thermal9.9 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.