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Wastewater treatment plants in Arizona

53 facilities · 171 MGD combined flow

Klarifi tracks 53 publicly owned wastewater treatment plants in Arizona with a combined average flow of 171 MGD, serving about 2,799,438 residents. 11 plants treat more than 1 MGD and 3 more than 10 MGD; 25 use lagoon systems and 13 have digesters or biogas infrastructure. The largest is 91st Avenue WWTP in Tolleson at 78.71 MGD. 9 NPDES permits expire this year and 12 next year.

Every plant below links to a profile with average and design flow, the NPDES permit and its expiry, a three-year compliance snapshot and the capital projects planned in its city. Treatment technology and verified contacts are shown with a free Klarifi account.

53 plant locations in Arizona; dot size follows average flow.

NPDES permits and renewals in Arizona

Every plant discharges under an NPDES permit that is renewed every five years, usually with tighter limits. The renewal year is the year a plant budgets for upgrades.

All NPDES permits in Arizona9 permits expiring in 202612 permits expiring in 2027Find plants near you on the map →

Largest wastewater treatment plants in Arizona

The 10 largest publicly owned wastewater treatment plants in Arizona by average flow, with NPDES permit, expiry and three-year violation count. Source: EPA ICIS-NPDES via Klarifi.
FacilityCityAvg flow (MGD)Design (MGD)NPDES permitExpiresViolations (3y)
91st Avenue WWTPTolleson78.71230AZ0020524Apr 20282
23rd Avenue Wastewater Treatment PlantPhoenix35.6763AZ0020559Jun 20292
Pima County - Ina Road WWTPTucson31.8950AZ0020001May 20273
Casa Grande WRFCasa Grande3.5414AZ0025178Sep 202929
Town Of Prescott Valley - WWTPPrescott Valley2.743.75AZ0025381Feb 20270
Northwest WrpMesa2.7218AZ0024031Nov 20296
Goodyear, City Of - 157th Ave WWTPGoodyear2.57.5AZ0022357Mar 20271
Town Of Buckeye - Sundance WwrfBuckeye2.026AZ0024881Apr 202937
Kayenta WWTFKayenta1.460.9NN0020281Jan 2029144
Buckeye WWTPBuckeye1.384.5AZ0025313Oct 20301

Treatment technology for each plant is shown with a free Klarifi account. Create one →

Arizona plants by treatment technology

All 53 plants in Arizona

FacilityCityFlow (MGD)
91st Avenue WWTPTolleson78.71
23rd Avenue Wastewater Treatment PlantPhoenix35.67
Pima County - Ina Road WWTPTucson31.89
Casa Grande WRFCasa Grande3.54
Town Of Prescott Valley - WWTPPrescott Valley2.74
Northwest WrpMesa2.72
Goodyear, City Of - 157th Ave WWTPGoodyear2.5
Town Of Buckeye - Sundance WwrfBuckeye2.02
Kayenta WWTFKayenta1.46
Buckeye WWTPBuckeye1.38
Cottonwood WWTFCottonwood1.04
City Of Safford - Gila Resources WrpSafford0.78
Chinle WWTFChinle0.71
American Gulch Wastewater Treatment PlantPayson0.69
City Of Somerton - WWTPSomerton0.65
Whiteriver Sewage LagoonWhiteriver0.58
Tucson Airport Remediation Project - Co-Mingled PlumeTucson0.56
Joint Venture WWTFParker0.54
Tuba City WWTPTuba City0.42
Window Rock Wastewater Treatment FacilityFort Defiance0.39
Pinal Creek WWTPGlobe0.35
Festival Ranch WRFBuckeye0.28
City Of PeoriaPeoria0.23
City Of Kingman - Downtown PondKingman0.23
Quartzsite, Town Of - WWTPQuartzsite0.2
Town Of Gila Bend - WWTPGila Bend0.18
Town Of Superior Wastewater Treatment Plant (wwtp)Superior0.13
Yuma Main Street Treatment PlantYuma0.12
Town Of Kearny Wastewater Reclamation FacilityKearny0.1
Town Of Patagonia - WWTPPatagonia0.05
City Of Tombstone - WWTPTombstone0.05
Tusayan Sanitary DistrictGrand Canyon0.03
City Of Mesa - Greenfield Water Reclamation PlantGilbert0.03
Winkelman WWTPWinkelman0.02
Agua Nueva WRFTucson
Apache Junction WWTPApache Junction
Benson, City Of - WWTFBenson
Bullhead City, City Of - Section 10 WWTPBullhead City
City Of Goodyear - Corgett Wash WRFGoodyear
City Of Goodyear - Rainbow Valley WRFGoodyear
City Of Williams - WWTPWilliams
City Of Winslow - WWTPWinslow
Ganado WWTPGanado
North Florence Wwtp, Town Of FlorenceFlorence
Painted Mesa Water Reclamation FacilityHolbrook
Pima County - Wwmd - Avra Valley WWTFTucson
Pima County - Wwmd - Green Valley Bnro - WWTPSahuarita
Rio De Flag WWTPFlagstaff
Six Mile Lagoon Wastewater Treatment FacilityPeridot
Tolleson WWTPTolleson
Town Of Cave Creek - WRFCave Creek
Town Of Florence WWTPFlorence
Town Of Marana Water Reclamation FacilityMarana

Wastewater treatment in Arizona: questions

Sources and methodology

Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.

Data refreshed September 21, 2026.

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