Town Of Windsor Wastewater Treatment Plant
8400 Windsor Rd, Windsor, CA 95492 · 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. It discharges under NPDES permit CA0023345 (expired), which expires in September 2025, with 14 recorded violations in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in March 2004.
Treatment technology
3 treatment structures and unit processes identified at Town Of Windsor Wastewater Treatment Plant.
Available with a free Klarifi account
See the full treatment train at Town Of Windsor Wastewater Treatment Plant: structures, unit processes and planned upgrades, with exact unit counts.
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.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for Town Of Windsor Wastewater Treatment Plant in EPA's ICIS system.
- Formal actions
- 1
- 0 since FY2020
- Compliance actions
- $5,000
- required by EPA orders
- EPA inspections
- 0
- none on record
Latest case · Mar 2004
Town of Windsor
Administrative order · SDWA, Nat'l Drinking Water Compliance Schedule - Effective Date · Unilateral Administrative Order Without Adjudication · Compliance actions $5,000
EPA's description of the case:
“This is a AO pursuant to the SDWA issued to Respondent. The violation involves failure to monitor and/or report data required by the Unregulated Contaminant Monitoring Rule by December 31, 2003. The…”
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Source: EPA ECHO, civil enforcement case 09-2004-0190.
Full case history with a free Klarifi account
Every action against Town Of Windsor Wastewater Treatment Plant with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
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.
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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
1.14 MGD
Forestville · 6 mi away
0.15 MGD
Graton · 7 mi away
0.3 MGD
Guerneville · 11 mi away
0.31 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 October 26, 2026; facility record last updated March 19, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Significant industrial user · WWTP · all terms