Walworth County Metro
Delavan, WI · Walworth County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 3.6 MGD
- NPDES permit
- WI0031461
- Expired
- Permit expires
- December 2025
- Population served
- 35,257
- CWNS 2022
Walworth County Metro is a publicly owned wastewater treatment plant in Delavan, Walworth County, Wisconsin, serving about 35,257 residents. Treatment on site includes clarifiers, biogas silos, biogas balloons. It discharges under NPDES permit WI0031461 (expired), which expires in December 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
1 verified contact for Walworth County Metro, with validated emails and direct phone numbers.
Unlock 1 verified contact
Names, validated emails and direct phone numbers for decision-makers at Walworth County Metro, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Wisconsin
Fontana · 8 mi away
0.9 MGD
Sharon · 10 mi away
0.12 MGD
Clinton · 12 mi away
0.17 MGD
Whitewater · 16 mi away
1.61 MGD
Milton · 17 mi away
0.34 MGD
Palmyra · 18 mi away
0.15 MGD
Genoa City · 18 mi away
0.2 MGD
Beloit · 19 mi away
3.79 MGD
Walworth County Metro: 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.