Casa Grande WRF
Casa Grande, AZ · Pinal County · Publicly Owned Treatment Works
- Average flow
- 3.54 MGD
- Design flow
- 14 MGD
- NPDES permit
- AZ0025178
- Effective
- Permit expires
- September 2029
- Population served
- 55,358
- CWNS 2022
Casa Grande WRF is a publicly owned wastewater treatment works in Casa Grande, Pinal County, Arizona treating an average of 3.54 million gallons per day against a permitted design capacity of 14 MGD, serving about 55,358 residents. Treatment on site includes clarifiers, covered lagoons, uncovered lagoons, carrousels / oxidation ditches, disinfection, chlorine/ chloramine. It discharges under NPDES permit AZ0025178 (effective), which expires in September 2029, with 29 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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Covered lagoons
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Uncovered lagoons
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Carrousels / oxidation ditches
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Disinfection, chlorine/ chloramine
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Compliance snapshot (last 3 years)
- Total violations
- 29
- Effluent violations
- 9
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
3 verified contacts for Casa Grande WRF, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Casa Grande WRF, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Arizona
Florence · 24 mi away
—
Gilbert · 25 mi away
0.03 MGD
Florence · 26 mi away
—
Apache Junction · 34 mi away
—
Mesa · 35 mi away
2.72 MGD
Phoenix · 40 mi away
35.67 MGD
Marana · 42 mi away
—
Tolleson · 43 mi away
78.71 MGD
Casa Grande WRF: 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 26, 2025.