Contra Costa Co San Dist 7a
Antioch, CA · Contra Costa County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 31.1 MGD
- NPDES permit
- CA0038547
- Effective
- Permit expires
- March 2031
- Population served
- 187,226
- CWNS 2022
Contra Costa Co San Dist 7a is a publicly owned wastewater treatment plant in Antioch, Contra Costa County, California, serving about 187,226 residents. Treatment on site includes clarifiers, biogas silos. It discharges under NPDES permit CA0038547 (effective), which expires in March 2031, with 1 recorded violation in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 1
- Effluent violations
- 1
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Contra Costa Co San Dist 7a.
No verified contacts on file yet
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Rio Vista · 12 mi away
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Martinez · 12 mi away
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Martinez · 14 mi away
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Rio Vista · 14 mi away
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Discovery Bay · 16 mi away
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Benicia · 17 mi away
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Contra Costa Co San Dist 7a: 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 July 29, 2026.