Rio Dell POTW
475 Hilltop Avenue, Rio Dell, CA 95562 · Humboldt County · Publicly Owned Treatment Works
- Average flow
- 0.35 MGD
- 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 treating an average of 0.35 million gallons per day against a permitted design capacity of 2.51 MGD, serving about 2,790 residents. It discharges under NPDES permit CA0022748 (expired), which expires in October 2022, with 129 recorded violations in the last three years.
Treatment technology
One treatment structure or unit process identified at Rio Dell POTW.
Available with a free Klarifi account
See the full treatment train at Rio Dell POTW: structures, unit processes and planned upgrades, with exact unit counts.
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.
No verified contacts on file yet
Klarifi verifies plant and municipal decision-makers continuously. Start a free trial to browse contacts at nearby plants and flag this one for verification.
Nearby wastewater treatment plants in California
Scotia · 1 mi away
0.0031 MGD
Fortuna · 7 mi away
1.13 MGD
Ferndale · 11 mi away
0.29 MGD
Loleta · 12 mi away
0.07 MGD
Eureka · 19 mi away
—
Samoa · 22 mi away
0.01 MGD
Arcata · 25 mi away
1.38 MGD
Redway · 29 mi away
—
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 October 26, 2026; facility record last updated November 28, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Ozonation · Activated sludge · all terms