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Plymouth City Utilities Commission

Sewage treatment plant, major discharger, Plymouth, Wisconsin. NPDES permit WI0030031 expired Dec 31, 2023; its limits still apply. Last 12 months: over a limit 2 times (last April 2026), 83 required values missing, 18 of 25 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (19 values), outfall 001 form Q quarterly (2 values), outfall 701 form A monthly (7 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
14 values over a limit, 48 required values missing, 19 of 28 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
February 2026Solids, total suspended, weekly average8762.64≤ 275 lb/d3086%
April 2026BOD, 5-day, 20 deg. C, weekly average332.325≤ 275 lb/d21%

Limits in force (58)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimum≥ 6 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 10 mg/LMay–Oct001
BOD, 5-day, 20 deg. Cweekly average≤ 18 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmonthly average≤ 10 mg/LMay–Oct001
BOD, 5-day, 20 deg. Cmonthly average≤ 18 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)May–Oct001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cweekly average≤ 138 lb/dMay–Oct001
BOD, 5-day, 20 deg. Cweekly average≤ 275 lb/dJan, Feb, Mar, Apr, Nov, Dec001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedweekly average≤ 18 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Solids, total suspendedweekly average≤ 10 mg/LMay–Oct001
Solids, total suspendedmonthly average≤ 18 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Solids, total suspendedmonthly average≤ 10 mg/LMay–Oct001
Solids, total suspendeddaily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec001
Solids, total suspendeddaily maximumreport only (mg/L)May–Oct001
Solids, total suspendedweekly average≤ 275 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Solids, total suspendedweekly average≤ 138 lb/dMay–Oct001
Nitrogen, ammonia total [as N]weekly average≤ 9 mg/LDec001
Nitrogen, ammonia total [as N]weekly average≤ 8 mg/LOct001
Nitrogen, ammonia total [as N]weekly average≤ 13 mg/LSep001
Nitrogen, ammonia total [as N]weekly average≤ 13 mg/LFeb001
Nitrogen, ammonia total [as N]weekly average≤ 20 mg/LApr001
Nitrogen, ammonia total [as N]weekly average≤ 13 mg/LJan001
Nitrogen, ammonia total [as N]weekly average≤ 18 mg/LMar001
Nitrogen, ammonia total [as N]weekly average≤ 9.6 mg/LNov001
Nitrogen, ammonia total [as N]weekly average≤ 9.4 mg/LJul001
Nitrogen, ammonia total [as N]weekly average≤ 8.5 mg/LAug001
Nitrogen, ammonia total [as N]weekly average≤ 28 mg/LMay001
Nitrogen, ammonia total [as N]weekly average≤ 14 mg/LJun001
Nitrogen, ammonia total [as N]monthly average≤ 5.1 mg/LDec001
Nitrogen, ammonia total [as N]monthly average≤ 4.3 mg/LOct001
Nitrogen, ammonia total [as N]monthly average≤ 7.6 mg/LSep001
Nitrogen, ammonia total [as N]monthly average≤ 7.63 mg/LFeb001
Nitrogen, ammonia total [as N]monthly average≤ 11 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 7.2 mg/LJan001
Nitrogen, ammonia total [as N]monthly average≤ 13 mg/LMar001
Nitrogen, ammonia total [as N]monthly average≤ 5.4 mg/LNov001
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/LJul001
Nitrogen, ammonia total [as N]monthly average≤ 5.1 mg/LAug001
Nitrogen, ammonia total [as N]monthly average≤ 18 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 9 mg/LJun001
Phosphorus, total [as P]monthly average≤ 1 mg/Lall year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Chloride [as Cl]daily maximumreport only (mg/L)all year001
Chloride [as Cl]quarterly maximumreport only (mg/L)all year001
Mercury, total recoverabledaily maximumreport only (ng/L)all year001
Mercury, total recoverablequarterly maximumreport only (ng/L)all year001
Coliform, fecal generalweekly geometric mean≤ 780 #/100mLMay–Sep001
Coliform, fecal generalgeometric mean≤ 400 #/100mLMay–Sep001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year701
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year701
Solids, total suspendedmonthly averagereport only (mg/L)all year701
Solids, total suspendeddaily maximumreport only (mg/L)all year701
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year701
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year701
Mercury, total recoverabledaily maximumreport only (ng/L)all year701

How strict are these limits?

Cited limits by parameter: Wisconsin's rules and the federal ones.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/WI0030031 · MCP: https://passage-data.com/mcp