Marshall WWTP
Marshall, MN · Lyon County · Publicly Owned Treatment Works
- Average flow
- 2.51 MGD
- Design flow
- 4.5 MGD
- NPDES permit
- MN0022179
- Effective
- Permit expires
- February 2029
- Population served
- 13,628
- CWNS 2022
Marshall WWTP is a publicly owned wastewater treatment works in Marshall, Lyon County, Minnesota treating an average of 2.51 million gallons per day against a permitted design capacity of 4.5 MGD, serving about 13,628 residents. Treatment on site includes clarifiers, uncovered lagoons, biogas silos, biogas balloons. It discharges under NPDES permit MN0022179 (effective), which expires in February 2029, with 16 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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Uncovered lagoons
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Biogas silos
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Biogas balloons
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Compliance snapshot (last 3 years)
- Total violations
- 16
- Effluent violations
- 2
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Marshall WWTP, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Marshall WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Minnesota
Ghent · 6 mi away
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Lynd · 7 mi away
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Cottonwood · 12 mi away
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Milroy · 12 mi away
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Minneota · 12 mi away
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Russell · 12 mi away
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Taunton · 15 mi away
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Balaton · 16 mi away
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Marshall WWTP: 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 20, 2025.