Eureka Wastewater Treatment Plant
Eureka, CA · Humboldt County · Publicly Owned Treatment Works
- Average flow
- 3.08 MGD
- Design flow
- 12 MGD
- NPDES permit
- CA0024449
- Effective
- Permit expires
- October 2028
- Population served
- 41,400
- CWNS 2022
Eureka Wastewater Treatment Plant is a publicly owned wastewater treatment works in Eureka, Humboldt County, California treating an average of 3.08 million gallons per day against a permitted design capacity of 12 MGD, serving about 41,400 residents. Treatment on site includes aerated lagoons, uncovered lagoons, biogas silos. It discharges under NPDES permit CA0024449 (effective), which expires in October 2028, with 24 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
- 24
- Effluent violations
- 24
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Capital improvement projects in Eureka
Eureka's capital improvement plan lists 17 water, sewer and wastewater line items worth $49M starting 2025–2028. The largest budgeted items are shown here.
All water and sewer capital projects in Eureka →
| Project | Budget | Years |
|---|---|---|
| WWTP Improvements - Eliminate Bypass | $20,000,000 | 2025–2027 |
| Water Distribution System Annual Maintenance & Repair | $9,000,000 | 2025–2030 |
| Wastewater Collection System Maintenance | $4,500,000 | 2025–2030 |
| Bio Solids Dewatering | $3,200,000 | 2026–2029 |
| Tank Recoating (Low Tank & Lundbar Hills Tank | $2,150,000 | 2026–2028 |
Full project details — scope, funding source, engineering consultant and the decision-makers behind each project — are available in Klarifi, along with similar wastewater capital projects in other cities.
Key contacts
4 verified contacts for Eureka Wastewater Treatment Plant, with validated emails and direct phone numbers.
Unlock 4 verified contacts (1 more than shown)
Names, validated emails and direct phone numbers for decision-makers at Eureka Wastewater Treatment Plant, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in California
Samoa · 3 mi away
0.0088 MGD
Arcata · 8 mi away
1.47 MGD
Loleta · 9 mi away
0.05 MGD
Fortuna · 12 mi away
0.71 MGD
Ferndale · 12 mi away
0.15 MGD
Mckinleyville · 13 mi away
—
Rio Dell · 19 mi away
—
Redway · 48 mi away
—
Eureka 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 January 27, 2025.