Norwalk Wastewater Treatment Facility
Norwalk, WI · Monroe County · Publicly Owned Treatment Works
- Average flow
- 0.02 MGD
- Design flow
- 0.14 MGD
- NPDES permit
- WI0024961
- Expired
- Permit expires
- March 2025
- Population served
- 676
- CWNS 2022
Norwalk Wastewater Treatment Facility is a publicly owned wastewater treatment works in Norwalk, Monroe County, Wisconsin treating an average of 0.02 million gallons per day against a permitted design capacity of 0.14 MGD, serving about 676 residents. Treatment on site includes biogas silos. It discharges under NPDES permit WI0024961 (expired), which expires in March 2025, with 26 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Biogas silos
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Compliance snapshot (last 3 years)
- Total violations
- 26
- Effluent violations
- 26
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Norwalk Wastewater Treatment Facility.
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Nearby wastewater treatment plants in Wisconsin
Wilton · 4 mi away
0.03 MGD
Cashton · 10 mi away
0.08 MGD
Sparta · 12 mi away
1.51 MGD
Tomah · 13 mi away
1.11 MGD
Fort Mccoy · 14 mi away
0.27 MGD
Hustler · 18 mi away
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La Farge · 18 mi away
0.04 MGD
Hillsboro · 19 mi away
0.14 MGD
Norwalk Wastewater Treatment Facility: 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 November 7, 2025.