City Of Plymouth
County Hwy Pp, Plymouth, WI 53073 · Sheboygan County · Publicly Owned Treatment Works
- Average flow
- 1.93 MGD
- Design flow
- 1.65 MGD
- NPDES permit
- WI0030031
- Expired
- Permit expires
- December 2023
- Population served
- 8,932
- CWNS 2022
City Of Plymouth is a publicly owned wastewater treatment plant in Plymouth, Sheboygan County, Wisconsin treating an average of 1.93 million gallons per day against a permitted design capacity of 1.65 MGD, serving about 8,932 residents. It discharges under NPDES permit WI0030031 (expired), which expires in December 2023, with 18 recorded violations in the last three years.
Treatment technology
3 treatment structures and unit processes identified at City Of Plymouth.
Available with a free Klarifi account
See the full treatment train at City Of Plymouth: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 18
- Effluent violations
- 16
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 Plymouth, 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 Plymouth, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Wisconsin
Cascade · 5 mi away
0.09 MGD
Hingham · 7 mi away
0.1 MGD
Oostburg · 9 mi away
0.04 MGD
Howards Grove · 10 mi away
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Oostburg · 11 mi away
0.34 MGD
Random Lake · 12 mi away
0.4 MGD
Sheboygan · 13 mi away
—
Cedar Grove · 13 mi away
0.17 MGD
City Of Plymouth: 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 26, 2026; facility record last updated July 3, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Ozonation · Activated sludge · all terms