Ironhouse Sd WWTP
Oakley, CA · Contra Costa County · Publicly Owned Treatment Works
- Average flow
- 2.71 MGD
- Design flow
- 4.3 MGD
- NPDES permit
- CA0085260
- Effective
- Permit expires
- July 2029
- Population served
- 39,600
- CWNS 2022
Ironhouse Sd WWTP is a publicly owned wastewater treatment works in Oakley, Contra Costa County, California treating an average of 2.71 million gallons per day against a permitted design capacity of 4.3 MGD, serving about 39,600 residents. It discharges under NPDES permit CA0085260 (effective), which expires in July 2029, with 9 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Treatment structure data not yet analyzed for this facility.
Compliance snapshot (last 3 years)
- Total violations
- 9
- Effluent violations
- 9
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
2 verified contacts for Ironhouse Sd WWTP, with validated emails and direct phone numbers.
Unlock 2 verified contacts
Names, validated emails and direct phone numbers for decision-makers at Ironhouse Sd WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in California
Brentwood · 3 mi away
1.46 MGD
Antioch · 8 mi away
—
Discovery Bay · 9 mi away
1.01 MGD
Rio Vista · 10 mi away
0.5 MGD
Rio Vista · 13 mi away
0.32 MGD
Mountain House · 18 mi away
1.74 MGD
Lodi · 18 mi away
—
Martinez · 20 mi away
—
Ironhouse Sd 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 19, 2026.