Mellen City Of
Mellen, WI · Ashland County · Publicly Owned Treatment Works
- Average flow
- 0.1 MGD
- Design flow
- 0.14 MGD
- NPDES permit
- WI0020311
- Expired
- Permit expires
- March 2025
- Population served
- 756
- CWNS 2022
Mellen City Of is a publicly owned wastewater treatment plant in Mellen, Ashland County, Wisconsin treating an average of 0.1 million gallons per day against a permitted design capacity of 0.14 MGD, serving about 756 residents. Treatment on site includes aerated lagoons. It discharges under NPDES permit WI0020311 (expired), which expires in March 2025, with 15 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Aerated lagoons
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Compliance snapshot (last 3 years)
- Total violations
- 15
- Effluent violations
- 15
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Mellen City Of.
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Glidden · 15 mi away
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Odanah · 20 mi away
0.05 MGD
Montreal · 21 mi away
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Ashland · 21 mi away
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Grand View · 22 mi away
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Washburn · 27 mi away
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Drummond · 29 mi away
0.02 MGD
Mellen City Of: 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 August 19, 2026.