Town Of Windsor Wastewater Treatment Plant
Windsor, CA · Sonoma County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 2.25 MGD
- NPDES permit
- CA0023345
- Expired
- Permit expires
- September 2025
- Population served
- 24,793
- CWNS 2022
Town Of Windsor Wastewater Treatment Plant is a publicly owned wastewater treatment works in Windsor, Sonoma County, California, serving about 24,793 residents. Treatment on site includes clarifiers, aerated lagoons, uncovered lagoons. It discharges under NPDES permit CA0023345 (expired), which expires in September 2025, with 14 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
- 14
- Effluent violations
- 8
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Capital improvement projects in Windsor
Windsor's capital improvement plan lists 20 water, sewer and wastewater line items worth $163M starting 2023–2027. The largest budgeted items are shown here.
All water and sewer capital projects in Windsor →
| Project | Budget | Years |
|---|---|---|
| Secondary Treatment System Upgrades | $56,516,000 | 2023–2027 |
| Biosolids Handling Facility | $56,423,000 | 2023–2027 |
| Off-River Groundwater Wells | $7,242,000 | 2023–2025 |
| AWT Filter Replacements | $6,544,203 | 2025–2028 |
| Emergency Generators at the Water Reclamation Facility | $5,929,000 | 2025–2027 |
Full project details — scope, funding source, engineering consultant and the decision-makers behind each project — are available in Klarifi, along with similar wastewater capital projects in other cities.
Key contacts
2 verified contacts for Town Of Windsor Wastewater Treatment Plant, with validated emails and direct phone numbers.
Unlock 2 verified contacts
Names, validated emails and direct phone numbers for decision-makers at Town Of Windsor Wastewater Treatment Plant, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in California
Windsor · 2 mi away
—
Healdsburg · 4 mi away
0.75 MGD
Forestville · 6 mi away
0.1 MGD
Graton · 7 mi away
0.28 MGD
Guerneville · 11 mi away
0.35 MGD
Santa Rosa · 12 mi away
—
Calistoga · 14 mi away
—
Saint Helena · 20 mi away
—
Town Of Windsor Wastewater Treatment Plant: 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 19, 2025.