San Mateo WWTF
San Mateo, CA · San Mateo County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- —
- NPDES permit
- CAL037541
- Effective
- Permit expires
- December 2030
- Population served
- 155,584
- CWNS 2022
San Mateo WWTF is a publicly owned wastewater treatment works in San Mateo, San Mateo County, California, serving about 155,584 residents. Treatment on site includes clarifiers, biogas silos, biogas balloons. It discharges under NPDES permit CAL037541 (effective), which expires in December 2030, with 105 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
- 105
- Effluent violations
- 4
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
12 verified contacts for San Mateo WWTF, with validated emails and direct phone numbers.
Unlock 12 verified contacts (9 more than shown)
Names, validated emails and direct phone numbers for decision-makers at San Mateo WWTF, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in California
Burlingame · 4 mi away
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San Francisco · 7 mi away
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Half Moon Bay · 11 mi away
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Pacifica · 11 mi away
1.91 MGD
Union City · 11 mi away
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San Leandro · 12 mi away
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San Francisco · 13 mi away
45.87 MGD
Oakland · 18 mi away
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San Mateo 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 September 11, 2026; facility record last updated March 6, 2025.