Ashippun Sanitary District
Ashippun, WI · Dodge County · Publicly Owned Treatment Works
- Average flow
- 0.09 MGD
- Design flow
- 0.07 MGD
- NPDES permit
- WI0031381
- Expired
- Permit expires
- June 2023
- Population served
- 2,071
- CWNS 2022
Ashippun Sanitary District is a publicly owned wastewater treatment plant in Ashippun, Dodge County, Wisconsin treating an average of 0.09 million gallons per day against a permitted design capacity of 0.07 MGD, serving about 2,071 residents. Treatment on site includes aerated lagoons, uncovered lagoons, carrousels / oxidation ditches. It discharges under NPDES permit WI0031381 (expired), which expires in June 2023, with 4 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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Uncovered lagoons
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Carrousels / oxidation ditches
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Compliance snapshot (last 3 years)
- Total violations
- 4
- Effluent violations
- 4
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Ashippun Sanitary District, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Ashippun Sanitary District, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Wisconsin
Lebanon · 5 mi away
0.05 MGD
Ixonia · 6 mi away
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Oconomowoc · 8 mi away
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Hustisford · 10 mi away
0.14 MGD
Hartford · 10 mi away
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Watertown · 11 mi away
2.81 MGD
Delafield · 12 mi away
2.33 MGD
Clyman · 12 mi away
0.02 MGD
Ashippun Sanitary District: 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 28, 2025.