Dunaweal WWTP
Calistoga, CA · Napa County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 4 MGD
- NPDES permit
- CA0037966
- Effective
- Permit expires
- April 2027
- Population served
- 4,981
- CWNS 2022
Dunaweal WWTP is a publicly owned wastewater treatment works in Calistoga, Napa County, California, serving about 4,981 residents. Treatment on site includes clarifiers, aerated lagoons, uncovered lagoons. It discharges under NPDES permit CA0037966 (effective), which expires in April 2027, with 30 recorded violations 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
- 30
- Effluent violations
- 11
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Dunaweal WWTP.
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Nearby wastewater treatment plants in California
Saint Helena · 8 mi away
—
Windsor · 14 mi away
—
Windsor · 14 mi away
—
Yountville · 16 mi away
—
Healdsburg · 17 mi away
0.75 MGD
Santa Rosa · 18 mi away
—
Forestville · 19 mi away
0.1 MGD
Graton · 19 mi away
0.28 MGD
Dunaweal 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 July 29, 2026.