Janesville Wastewater Utility
Janesville, WI · Rock County · Publicly Owned Treatment Works
- Average flow
- 9.98 MGD
- Design flow
- 17.18 MGD
- NPDES permit
- WI0030350
- Expired
- Permit expires
- June 2025
- Population served
- 63,000
- CWNS 2022
Janesville Wastewater Utility is a publicly owned wastewater treatment works in Janesville, Rock County, Wisconsin treating an average of 9.98 million gallons per day against a permitted design capacity of 17.18 MGD, serving about 63,000 residents. Treatment on site includes clarifiers, biogas silos, biogas balloons. It discharges under NPDES permit WI0030350 (expired), which expires in June 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.
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
9 verified contacts for Janesville Wastewater Utility, with validated emails and direct phone numbers.
Unlock 9 verified contacts (6 more than shown)
Names, validated emails and direct phone numbers for decision-makers at Janesville Wastewater Utility, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Wisconsin
Hanover · 4 mi away
0.0016 MGD
Beloit · 5 mi away
0.55 MGD
Footville · 8 mi away
0.11 MGD
Beloit · 10 mi away
3.79 MGD
Clinton · 11 mi away
0.17 MGD
Milton · 12 mi away
0.34 MGD
Edgerton · 12 mi away
0.49 MGD
Edgerton · 13 mi away
0.47 MGD
Janesville Wastewater Utility: 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 April 13, 2025.