Rio Dell POTW
Rio Dell, CA · Humboldt County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 2.51 MGD
- NPDES permit
- CA0022748
- Expired
- Permit expires
- October 2022
- Population served
- 2,790
- CWNS 2022
Rio Dell POTW is a publicly owned wastewater treatment works in Rio Dell, Humboldt County, California, serving about 2,790 residents. Treatment on site includes clarifiers. It discharges under NPDES permit CA0022748 (expired), which expires in October 2022, with 129 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
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Compliance snapshot (last 3 years)
- Total violations
- 129
- Effluent violations
- 95
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Rio Dell POTW.
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Redway · 29 mi away
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Mckinleyville · 31 mi away
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Rio Dell POTW: 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 November 28, 2025.