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City of Monroe

Sewage treatment plant, major discharger, Monroe, Wisconsin. NPDES permit WI0020362 expired Dec 31, 2025; its limits still apply. Last 12 months: over a limit 12 times (last June 2026), 17 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 21 days after each period: outfall 001 form A monthly (11 values), outfall 001 form Q quarterly (4 values), outfall 105 form Q quarterly (1 value), outfall 701 form A monthly (6 values), outfall 701 form Q quarterly (1 value)
Last report on file
June 2026
Oct 2024 – Sep 2025
0 values over a limit, 15 required values missing, 2 of 36 reports late

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

Period endingParameterReportedLimitOver by
December 2025Phosphorus, total [as P], 6-month average.394≤ .092 mg/L328%
December 2025Phosphorus, total [as P], 6-month average4.7924≤ 2.8 lb/d71%
January 2026Phosphorus, total [as P], 6-month average.2562≤ .092 mg/L178%
January 2026Phosphorus, total [as P], 6-month average3.2153≤ 2.8 lb/d15%
February 2026Phosphorus, total [as P], 6-month average.1217≤ .092 mg/L32%
March 2026Phosphorus, total [as P], 6-month average.1322≤ .092 mg/L44%
April 2026Phosphorus, total [as P], 6-month average.1742≤ .092 mg/L89%
April 2026Phosphorus, total [as P], 6-month average2.8242≤ 2.8 lb/d1%
April 2026pH, daily minimum4.73≥ 6 SU—
May 2026Phosphorus, total [as P], 6-month average.3763≤ .092 mg/L309%
May 2026Phosphorus, total [as P], 6-month average5.5497≤ 2.8 lb/d98%
June 2026Phosphorus, total [as P], 6-month average.1128≤ .092 mg/L23%

Limits in force (23)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitmonthly maximumreport only (deg F)all year001
Oxygen, dissolved [DO]daily minimum≥ 6 mg/Lall year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Nitrogen, total [as N]quarterly maximumreport only (mg/L)all year001
Nitrogen, Kjeldahl, total [as N]quarterly maximumreport only (mg/L)all year001
Nitrite + Nitrate total [as N]quarterly maximumreport only (mg/L)all year001
Phosphorus, total [as P]6-month average≤ .092 mg/Lall year001
Phosphorus, total [as P]6-month average≤ 2.8 lb/dall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all year001
Chlorine, total residualweekly average≤ 9.6 ug/Lall year001
Chlorine, total residualmonthly average≤ 9.6 ug/Lall year001
Chlorine, total residualdaily maximum≤ 38 ug/Lall year001
Mercury, total recoverablequarterly maximumreport only (ng/L)all year001
Mercury, total recoverablequarterly maximumreport only (ng/L)all year105
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year701
BOD, 5-day, 20 deg. Cmonthly maximumreport only (mg/L)all year701
Solids, total suspendedmonthly averagereport only (mg/L)all year701
Solids, total suspendedmonthly maximumreport only (mg/L)all year701
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year701
Flow, in conduit or thru treatment plantmonthly 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.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/WI0020362 · MCP: https://passage-data.com/mcp