Mountain House WWTP
Mountain House, CA · San Joaquin County · Publicly Owned Treatment Works
- Average flow
- 1.74 MGD
- Design flow
- 3 MGD
- NPDES permit
- CA0084271
- Effective
- Permit expires
- July 2028
- Population served
- —
- CWNS 2022
Mountain House WWTP is a publicly owned wastewater treatment works in Mountain House, San Joaquin County, California treating an average of 1.74 million gallons per day against a permitted design capacity of 3 MGD. Treatment on site includes uncovered lagoons. It discharges under NPDES permit CA0084271 (effective), which expires in July 2028, with 38 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Uncovered lagoons
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Compliance snapshot (last 3 years)
- Total violations
- 38
- Effluent violations
- 24
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Mountain House WWTP.
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Nearby wastewater treatment plants in California
Tracy · 6 mi away
8.9 MGD
Discovery Bay · 8 mi away
1.01 MGD
Manteca · 14 mi away
5.18 MGD
Stockton · 15 mi away
29.2 MGD
Brentwood · 15 mi away
1.46 MGD
Livermore · 17 mi away
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Oakley · 18 mi away
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Lodi · 22 mi away
—
Mountain House 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 March 15, 2025.