Pima County - Ina Road WWTP
Tucson, AZ · Pima County · Publicly Owned Treatment Works
- Average flow
- 31.89 MGD
- Design flow
- 50 MGD
- NPDES permit
- AZ0020001
- Effective
- Permit expires
- May 2027
- Population served
- 400,657
- CWNS 2022
Pima County - Ina Road WWTP is a publicly owned wastewater treatment works in Tucson, Pima County, Arizona treating an average of 31.89 million gallons per day against a permitted design capacity of 50 MGD, serving about 400,657 residents. Treatment on site includes clarifiers, uncovered lagoons, biogas silos, disinfection, chlorine/ chloramine. It discharges under NPDES permit AZ0020001 (effective), which expires in May 2027, with 3 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
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Uncovered lagoons
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Biogas silos
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Disinfection, chlorine/ chloramine
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Compliance snapshot (last 3 years)
- Total violations
- 3
- Effluent violations
- 3
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
6 verified contacts for Pima County - Ina Road WWTP, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Pima County - Ina Road WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Arizona
Tucson · 4 mi away
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Tucson · 13 mi away
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Marana · 16 mi away
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Tucson · 18 mi away
0.56 MGD
Sahuarita · 30 mi away
—
Winkelman · 48 mi away
0.02 MGD
Kearny · 51 mi away
0.1 MGD
Benson · 52 mi away
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Pima County - Ina Road WWTP: 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 August 9, 2026.