Discovery Bay WWTP
Discovery Bay, CA · Contra Costa County · Publicly Owned Treatment Works
- Average flow
- 1.01 MGD
- Design flow
- 2.35 MGD
- NPDES permit
- CA0078590
- Effective
- Permit expires
- January 2030
- Population served
- 7,200
- CWNS 2022
Discovery Bay WWTP is a publicly owned wastewater treatment works in Discovery Bay, Contra Costa County, California treating an average of 1.01 million gallons per day against a permitted design capacity of 2.35 MGD, serving about 7,200 residents. Treatment on site includes clarifiers, uncovered lagoons, carrousels / oxidation ditches. It discharges under NPDES permit CA0078590 (effective), which expires in January 2030, 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
- 5
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
3 verified contacts for Discovery Bay WWTP, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Discovery Bay WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in California
Brentwood · 7 mi away
1.46 MGD
Mountain House · 8 mi away
1.74 MGD
Oakley · 9 mi away
2.71 MGD
Tracy · 13 mi away
8.9 MGD
Stockton · 14 mi away
29.2 MGD
Antioch · 16 mi away
—
Lodi · 17 mi away
—
Rio Vista · 18 mi away
0.5 MGD
Discovery Bay 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.