Soscol WRF
Napa, CA · Napa County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 23 MGD
- NPDES permit
- CA0037575
- Effective
- Permit expires
- March 2027
- Population served
- 74,970
- CWNS 2022
Soscol WRF is a publicly owned wastewater treatment works in Napa, Napa County, California, serving about 74,970 residents. Treatment on site includes aerated lagoons, uncovered lagoons, biogas silos, biogas balloons. It discharges under NPDES permit CA0037575 (effective), which expires in March 2027, with 11 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Aerated lagoons
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Uncovered lagoons
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Biogas silos
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Biogas balloons
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Compliance snapshot (last 3 years)
- Total violations
- 11
- Effluent violations
- 6
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
7 verified contacts for Soscol WRF, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Soscol WRF, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in California
American Canyon · 3 mi away
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Sonoma · 9 mi away
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Vallejo · 10 mi away
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Yountville · 12 mi away
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Rodeo · 13 mi away
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Benicia · 15 mi away
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Pinole · 15 mi away
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Novato · 17 mi away
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Soscol WRF: 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 9, 2025.