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City of Manitowoc

Sewage treatment plant, major discharger, Manitowoc, Wisconsin. NPDES permit WI0024601 expired Mar 31, 2023; its limits still apply. Last 12 months: over a limit 15 times (last June 2026), 85 required values missing, 12 of 28 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (25 values), outfall 001 form Q quarterly (1 value), outfall 701 form A monthly (12 values), outfall 701 form Q quarterly (1 value)
Last report on file
June 2026
Oct 2024 – Sep 2025
14 values over a limit, 17 required values missing, 12 of 32 reports late

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

All 15 values over a limit
Period endingParameterReportedLimitOver by
November 2025BOD, 5-day, 20 deg. C, monthly average31.4762≤ 30 mg/L5%
November 2025BOD, 5-day, 20 deg. C, weekly average52.2≤ 45 mg/L16%
December 2025BOD, 5-day, 20 deg. C, monthly average33.4783≤ 30 mg/L12%
December 2025BOD, 5-day, 20 deg. C, weekly average> 43.6≤ 45 mg/L—
January 2026BOD, 5-day, 20 deg. C, monthly average33.3333≤ 30 mg/L11%
January 2026BOD, 5-day, 20 deg. C, weekly average46.2≤ 45 mg/L3%
March 2026BOD, 5-day, 20 deg. C, monthly average33.1304≤ 30 mg/L10%
April 2026BOD, 5-day, 20 deg. C, monthly average37.9091≤ 30 mg/L26%
April 2026BOD, 5-day, 20 deg. C, weekly average60.2≤ 45 mg/L34%
May 2026BOD, 5-day, 20 deg. C, monthly average52.9048≤ 30 mg/L76%
May 2026BOD, 5-day, 20 deg. C, weekly average72≤ 45 mg/L60%
May 2026Phosphorus, total [as P], monthly average1.0238≤ .9 mg/L14%
June 2026BOD, 5-day, 20 deg. C, monthly average39.7273≤ 30 mg/L32%
June 2026BOD, 5-day, 20 deg. C, weekly average46.4≤ 45 mg/L3%
June 2026Phosphorus, total [as P], monthly average1.0318≤ .9 mg/L15%

Limits in force (42)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendeddaily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]weekly average≤ 39 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 39 mg/LApr–Sep001
Nitrogen, ammonia total [as N]monthly average≤ 34 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 30 mg/LApr–Sep001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jan, Feb, Mar, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Apr–Sep001
Phosphorus, total [as P]monthly average≤ .9 mg/Lall year001
Nickel, total recoverabledaily maximumreport only (ug/L)all year001
Zinc, total recoverabledaily maximumreport only (ug/L)all year001
Cadmium, total recoverabledaily maximumreport only (ug/L)all year001
Lead, total recoverabledaily maximumreport only (ug/L)all year001
Chromium, total recoverabledaily maximumreport only (ug/L)all year001
Copper, total recoverabledaily maximumreport only (ug/L)all year001
Chlorine, total residualweekly average≤ 38 ug/Lall year001
Chlorine, total residualmonthly average≤ 38 ug/Lall year001
Chlorine, total residualdaily maximum≤ 38 ug/Lall year001
E. colimonthly averagereport only (#/100mL)May–Sep001
E. colidaily maximumreport only (#/100mL)May–Sep001
Mercury, total recoverabledaily maximum≤ 7.1 ng/Lall year001
Coliform, fecal generalweekly geometric mean≤ 656 #/100mLall year001
Coliform, fecal generalgeometric mean≤ 400 #/100mLall year001
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
Nickel, total recoverabledaily maximumreport only (ug/L)all year701
Zinc, total recoverabledaily maximumreport only (ug/L)all year701
Cadmium, total recoverabledaily maximumreport only (ug/L)all year701
Lead, total recoverabledaily maximumreport only (ug/L)all year701
Chromium, total recoverabledaily maximumreport only (ug/L)all year701
Copper, total recoverabledaily maximumreport only (ug/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 recoverablequarterly 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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Your permit document is the final word. As JSON: /api/v1/permits/WI0024601 · MCP: https://passage-data.com/mcp