Mckinleyville Csd - Wastewater Treatment Plant
Mckinleyville, CA · Humboldt County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 3.08 MGD
- NPDES permit
- CA0024490
- Expired
- Permit expires
- October 2023
- Population served
- 15,210
- CWNS 2022
Mckinleyville Csd - Wastewater Treatment Plant is a publicly owned wastewater treatment works in Mckinleyville, Humboldt County, California, serving about 15,210 residents. Treatment on site includes clarifiers, uncovered lagoons. It discharges under NPDES permit CA0024490 (expired), which expires in October 2023, with 7 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
- 7
- Effluent violations
- 7
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Mckinleyville Csd - Wastewater Treatment Plant.
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Nearby wastewater treatment plants in California
Arcata · 7 mi away
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Samoa · 10 mi away
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Eureka · 13 mi away
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Loleta · 22 mi away
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Fortuna · 25 mi away
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Ferndale · 25 mi away
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Rio Dell · 31 mi away
—
Crescent City · 55 mi away
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Mckinleyville Csd - Wastewater Treatment Plant: 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 19, 2025.