Williams WWTP
Williams, CA · Colusa County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 0.5 MGD
- NPDES permit
- CAC433345
- Expired
- Permit expires
- November 2022
- Population served
- —
- CWNS 2022
Williams WWTP is a publicly owned wastewater treatment works in Williams, Colusa County, California. Treatment on site includes clarifiers, carrousels / oxidation ditches. It discharges under NPDES permit CAC433345 (expired), which expires in November 2022, with 59 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
- 59
- Effluent violations
- 28
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Williams WWTP.
No verified contacts on file yet
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Nearby wastewater treatment plants in California
Colusa · 7 mi away
0.46 MGD
Willows · 23 mi away
—
Live Oak · 26 mi away
0.74 MGD
Yuba City · 29 mi away
5.05 MGD
Marysville · 31 mi away
2.41 MGD
Olivehurst · 33 mi away
1.99 MGD
Oroville · 38 mi away
3.4 MGD
Woodland · 42 mi away
2.61 MGD
Williams 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.