City Of Sun Prairie Site
3040 Bailey Rd, Sun Prairie, WI 53590 · Dane County · Publicly Owned Treatment Works
- Average flow
- 3.41 MGD
- Design flow
- 4.4 MGD
- NPDES permit
- WI0020478
- Expired
- Permit expires
- September 2023
- Population served
- 30,909
- CWNS 2022
City Of Sun Prairie Site is a publicly owned wastewater treatment plant in Sun Prairie, Dane County, Wisconsin treating an average of 3.41 million gallons per day against a permitted design capacity of 4.4 MGD, serving about 30,909 residents. It discharges under NPDES permit WI0020478 (expired), which expires in September 2023, with 0 recorded violations in the last three years.
Treatment technology
2 treatment structures and unit processes identified at City Of Sun Prairie Site.
Available with a free Klarifi account
See the full treatment train at City Of Sun Prairie Site: structures, unit processes and planned upgrades, with exact unit counts.
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
5 verified contacts for City Of Sun Prairie Site, with validated emails and direct phone numbers.
Unlock 5 verified contacts (2 more than shown)
Names, validated emails and direct phone numbers for decision-makers at City Of Sun Prairie Site, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Wisconsin
Marshall · 9 mi away
0.35 MGD
Madison · 10 mi away
39.37 MGD
Deerfield · 11 mi away
0.2 MGD
Cambridge · 15 mi away
0.37 MGD
Rockdale · 16 mi away
0.01 MGD
Columbus · 17 mi away
1.11 MGD
Stoughton · 17 mi away
1.1 MGD
Lake Mills · 18 mi away
0.61 MGD
City Of Sun Prairie Site: 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 October 19, 2026; facility record last updated May 29, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Ozonation · Activated sludge · all terms