23rd Avenue Wastewater Treatment Plant
Phoenix, AZ · Maricopa County · Publicly Owned Treatment Works
- Average flow
- 35.67 MGD
- Design flow
- 63 MGD
- NPDES permit
- AZ0020559
- Effective
- Permit expires
- June 2029
- Population served
- 1,604,039
- CWNS 2022
23rd Avenue Wastewater Treatment Plant is a publicly owned wastewater treatment works in Phoenix, Maricopa County, Arizona treating an average of 35.67 million gallons per day against a permitted design capacity of 63 MGD, serving about 1,604,039 residents. Treatment on site includes clarifiers, biogas silos, disinfection, chlorine/ chloramine. It discharges under NPDES permit AZ0020559 (effective), which expires in June 2029, with 2 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
Unlock
Biogas silos
Unlock
Disinfection, chlorine/ chloramine
unit processUnlock exact unit counts →
Compliance snapshot (last 3 years)
- Total violations
- 2
- Effluent violations
- 2
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Capital improvement projects in Phoenix
Phoenix's capital improvement plan lists 275 water, sewer and wastewater line items worth $4.3B starting 2024–2029. The largest budgeted items are shown here.
All water and sewer capital projects in Phoenix →
| Project | Budget | Years |
|---|---|---|
| Cave Creek Water Reclamation Plant Rehabilitation | $293,000,000 | 2024–2028 |
| Groundwater Wells | $178,400,000 | 2024–2029 |
| Aquifer Storage | $169,261,867 | 2024–2029 |
| Small Diameter Sewer Rehabilitation | $96,975,000 | 2024–2029 |
| Deer Valley Water Treatment Plant Rehabilitation | $83,195,000 | 2025–2029 |
Full project details — scope, funding source, engineering consultant and the decision-makers behind each project — are available in Klarifi, along with similar wastewater capital projects in other cities.
Key contacts
14 verified contacts for 23rd Avenue Wastewater Treatment Plant, with validated emails and direct phone numbers.
Unlock 14 verified contacts (11 more than shown)
Names, validated emails and direct phone numbers for decision-makers at 23rd Avenue Wastewater Treatment Plant, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Arizona
Tolleson · 8 mi away
78.71 MGD
Tolleson · 9 mi away
—
Mesa · 16 mi away
2.72 MGD
Goodyear · 17 mi away
2.5 MGD
Goodyear · 21 mi away
—
Buckeye · 23 mi away
2.02 MGD
Gilbert · 24 mi away
0.03 MGD
Peoria · 24 mi away
0.23 MGD
23rd Avenue Wastewater Treatment Plant: frequently asked 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 11, 2026; facility record last updated March 4, 2025.