Watertown Wastewater Treatment
Watertown, WI · Jefferson County · Publicly Owned Treatment Works
- Average flow
- 2.81 MGD
- Design flow
- 5.2 MGD
- NPDES permit
- WI0028541
- Expired
- Permit expires
- September 2025
- Population served
- 24,743
- CWNS 2022
Watertown Wastewater Treatment is a publicly owned wastewater treatment works in Watertown, Jefferson County, Wisconsin treating an average of 2.81 million gallons per day against a permitted design capacity of 5.2 MGD, serving about 24,743 residents. Treatment on site includes clarifiers. It discharges under NPDES permit WI0028541 (expired), which expires in September 2025, with 0 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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Compliance snapshot (last 3 years)
- Total violations
- 0
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
2 verified contacts for Watertown Wastewater Treatment, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Watertown Wastewater Treatment, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Wisconsin
Ixonia · 7 mi away
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Lebanon · 8 mi away
0.05 MGD
Lake Mills · 10 mi away
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Reeseville · 10 mi away
0.16 MGD
Ashippun · 11 mi away
0.09 MGD
Clyman · 11 mi away
0.02 MGD
Lowell · 11 mi away
0.02 MGD
Oconomowoc · 13 mi away
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Watertown Wastewater Treatment: 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 May 29, 2025.