Imperial WWTP
Imperial, CA · Imperial County · Publicly Owned Treatment Works
- Average flow
- 1.4 MGD
- Design flow
- 2.4 MGD
- NPDES permit
- CA0104400
- Expired
- Permit expires
- September 2020
- Population served
- 19,227
- CWNS 2022
Imperial WWTP is a publicly owned wastewater treatment works in Imperial, Imperial County, California treating an average of 1.4 million gallons per day against a permitted design capacity of 2.4 MGD, serving about 19,227 residents. Treatment on site includes clarifiers, uncovered lagoons, carrousels / oxidation ditches. It discharges under NPDES permit CA0104400 (expired), which expires in September 2020, with 5 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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Carrousels / oxidation ditches
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Compliance snapshot (last 3 years)
- Total violations
- 5
- Effluent violations
- 2
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Imperial WWTP.
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Nearby wastewater treatment plants in California
El Centro · 3 mi away
3.7 MGD
Holtville · 8 mi away
0.36 MGD
Heber · 8 mi away
0.48 MGD
Seeley · 9 mi away
0.1 MGD
Brawley · 12 mi away
—
Calexico · 12 mi away
2.5 MGD
Westmorland · 14 mi away
0.2 MGD
Calipatria · 20 mi away
0.7 MGD
Imperial 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 May 10, 2025.