Plymouth Town Sanitary District #1 WWTF
Hanover, WI · Rock County · Publicly Owned Treatment Works
- Average flow
- 0.0016 MGD
- Design flow
- 0.03 MGD
- NPDES permit
- WI0031054
- Expired
- Permit expires
- December 2019
- Population served
- 314
- CWNS 2022
Plymouth Town Sanitary District #1 WWTF is a publicly owned wastewater treatment works in Hanover, Rock County, Wisconsin treating an average of 0.0016 million gallons per day against a permitted design capacity of 0.03 MGD, serving about 314 residents. Treatment on site includes uncovered lagoons. It discharges under NPDES permit WI0031054 (expired), which expires in December 2019, with 1 recorded violation in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Uncovered lagoons
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Compliance snapshot (last 3 years)
- Total violations
- 1
- Effluent violations
- 1
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Plymouth Town Sanitary District #1 WWTF.
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Nearby wastewater treatment plants in Wisconsin
Footville · 4 mi away
0.11 MGD
Janesville · 4 mi away
9.98 MGD
Beloit · 7 mi away
0.55 MGD
Evansville · 12 mi away
0.09 MGD
Brodhead · 12 mi away
0.21 MGD
Beloit · 12 mi away
3.79 MGD
Edgerton · 13 mi away
0.49 MGD
Edgerton · 14 mi away
0.47 MGD
Plymouth Town Sanitary District #1 WWTF: 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.