Onion River Wastewater Commission
Hingham, WI · Sheboygan County · Publicly Owned Treatment Works
- Average flow
- 0.08 MGD
- Design flow
- —
- NPDES permit
- WI0036811
- Expired
- Permit expires
- September 2023
- Population served
- 2,554
- CWNS 2022
Onion River Wastewater Commission is a publicly owned wastewater treatment works in Hingham, Sheboygan County, Wisconsin treating an average of 0.08 million gallons per day, serving about 2,554 residents. Treatment on site includes carrousels / oxidation ditches, biogas balloons. It discharges under NPDES permit WI0036811 (expired), which expires in September 2023, with 2 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
- 2
- Effluent violations
- 2
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Onion River Wastewater Commission.
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Nearby wastewater treatment plants in Wisconsin
Cascade · 5 mi away
0.09 MGD
Oostburg · 5 mi away
0.02 MGD
Oostburg · 6 mi away
0.27 MGD
Random Lake · 7 mi away
0.38 MGD
Cedar Grove · 7 mi away
0.12 MGD
Plymouth · 7 mi away
—
Belgium · 9 mi away
0.19 MGD
Sheboygan · 11 mi away
—
Onion River Wastewater Commission: 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 November 28, 2025.