Seneca Wastewater Treatment Plant
Eagan, MN · Dakota County · Publicly Owned Treatment Works
- Average flow
- 20.92 MGD
- Design flow
- 38 MGD
- NPDES permit
- MN0030007
- Effective
- Permit expires
- November 2028
- Population served
- 324,967
- CWNS 2022
Seneca Wastewater Treatment Plant is a publicly owned wastewater treatment works in Eagan, Dakota County, Minnesota treating an average of 20.92 million gallons per day against a permitted design capacity of 38 MGD, serving about 324,967 residents. Treatment on site includes clarifiers. It discharges under NPDES permit MN0030007 (effective), which expires in November 2028, with 6 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
- 6
- Effluent violations
- 5
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
3 verified contacts for Seneca Wastewater Treatment Plant, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Seneca Wastewater Treatment Plant, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Minnesota
Saint Paul · 11 mi away
180 MGD
Shakopee · 11 mi away
26.54 MGD
Farmington · 12 mi away
12.05 MGD
Prior Lake · 14 mi away
0.74 MGD
Cottage Grove · 15 mi away
6 MGD
Robbinsdale · 15 mi away
0.68 MGD
Vermillion · 16 mi away
0.02 MGD
Hampton · 18 mi away
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Seneca 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 May 20, 2025.