Willows WWTF
1600 Tehema Street, Willows, CA 95988 · Glenn County · Publicly Owned Treatment Works
- Average flow
- 0.57 MGD
- Design flow
- 1.2 MGD
- NPDES permit
- CAC447786
- Expired
- Permit expires
- November 2022
- Population served
- —
- CWNS 2022
Willows WWTF is a publicly owned wastewater treatment works in Willows, Glenn County, California treating an average of 0.57 million gallons per day against a permitted design capacity of 1.2 MGD. It discharges under NPDES permit CAC447786 (expired), which expires in November 2022, with 54 recorded violations in the last three years.
Treatment technology
3 treatment structures and unit processes identified at Willows WWTF.
Available with a free Klarifi account
See the full treatment train at Willows WWTF: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 54
- Effluent violations
- 4
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Capital improvement projects in Willows
Willows's capital improvement plan lists 9 water, sewer and wastewater line items worth $4M starting 2024–2026. The largest budgeted items are shown here.
All water and sewer capital projects in Willows →
| Project | Budget | Years |
|---|---|---|
| Annual Sewer Replacement Project | $2,698,000 | 2024–2027 |
| Wastewater Treatment Administration Bldg. | $500,000 | 2026–2027 |
| WWTP Upgrades | $302,000 | 2024–2027 |
| Lassen Street Sewer Pump Station Rehabilitation | $260,000 | 2024–2025 |
| WWTP - Clarifier Improvements | $200,000 | 2026–2027 |
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
Decision-makers at Willows WWTF.
No verified contacts on file yet
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Nearby wastewater treatment plants in California
Williams · 23 mi away
—
Colusa · 23 mi away
0.55 MGD
Corning · 29 mi away
0.61 MGD
Live Oak · 32 mi away
0.8 MGD
Oroville · 33 mi away
3.13 MGD
Yuba City · 41 mi away
5.16 MGD
Marysville · 43 mi away
3.74 MGD
Olivehurst · 46 mi away
1.99 MGD
Willows WWTF: 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 September 14, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Centrate · Ozonation · all terms