La Co., Sanitation Dist
Pomona, CA · Los Angeles County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 15 MGD
- NPDES permit
- CA0053619
- Administratively continued
- Permit expires
- July 2026
- Population served
- 311,175
- CWNS 2022
La Co., Sanitation Dist is a publicly owned wastewater treatment plant in Pomona, Los Angeles County, California, serving about 311,175 residents. Treatment on site includes uncovered lagoons. It discharges under NPDES permit CA0053619 (administratively continued), which expires in July 2026, with 11 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Uncovered lagoons
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Compliance snapshot (last 3 years)
- Total violations
- 11
- Effluent violations
- 3
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for La Co., Sanitation Dist, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at La Co., Sanitation Dist, plus the full compliance history and discharge data.
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6.4 MGD
Whittier · 13 mi away
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Corona · 14 mi away
8.54 MGD
Corona · 15 mi away
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South El Monte · 16 mi away
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Riverside · 20 mi away
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Cerritos · 22 mi away
—
Long Beach · 24 mi away
4.44 MGD
La Co., Sanitation Dist: 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 May 10, 2025.