Sussex Wastewater Treatment Facility
Sussex, WI · Waukesha County · Publicly Owned Treatment Works
- Average flow
- 2.57 MGD
- Design flow
- 1 MGD
- NPDES permit
- WI0020559
- Expired
- Permit expires
- December 2024
- Population served
- 16,684
- CWNS 2022
Sussex Wastewater Treatment Facility is a publicly owned wastewater treatment works in Sussex, Waukesha County, Wisconsin treating an average of 2.57 million gallons per day against a permitted design capacity of 1 MGD, serving about 16,684 residents. Treatment on site includes carrousels / oxidation ditches, biogas balloons. It discharges under NPDES permit WI0020559 (expired), which expires in December 2024, with 3 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
- 3
- Effluent violations
- 3
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Capital improvement projects in Sussex
Sussex's capital improvement plan lists 9 water, sewer and wastewater line items worth $21M starting 2025–2030. The largest budgeted items are shown here.
All water and sewer capital projects in Sussex →
| Project | Budget | Years |
|---|---|---|
| Well 6&7 treatment plant upgrade | $5,200,000 | 2028–2028 |
| Spring Green, Pembrooke, Crestview & Parkview Road Improvements | $3,350,000 | 2027–2027 |
| Eagles Ridge (Mill/Overlay) 5 miles | $2,700,000 | 2026–2026 |
| Woodland Creek/Centennial Oaks Road Improvements | $2,600,000 | 2029–2029 |
| Arterial Street Improvements | $2,000,000 | 2030–2030 |
Full project details — scope, funding source, engineering consultant and the decision-makers behind each project — are available in Klarifi, along with similar wastewater capital projects in other cities.
Key contacts
1 verified contact for Sussex Wastewater Treatment Facility, with validated emails and direct phone numbers.
Unlock 1 verified contact
Names, validated emails and direct phone numbers for decision-makers at Sussex Wastewater Treatment Facility, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Wisconsin
Brookfield · 5 mi away
8.95 MGD
Waukesha · 9 mi away
3.15 MGD
Delafield · 11 mi away
2.33 MGD
Jackson · 14 mi away
0.95 MGD
Oconomowoc · 15 mi away
—
Slinger · 15 mi away
0.77 MGD
Dousman · 15 mi away
0.48 MGD
Milwaukee · 17 mi away
95.1 MGD
Sussex Wastewater Treatment Facility: 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 March 6, 2025.