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City of Fennimore

Sewage treatment plant, Fennimore, Wisconsin. NPDES permit WI0023981 expired Sep 30, 2024; its limits still apply. Last 12 months: over a limit 7 times (last June 2026), 77 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 21 days after each period: outfall 001 form A monthly (15 values), outfall 701 form A monthly (4 values), outfall 001 form AN yearly
Last report on file
June 2026
Oct 2024 – Sep 2025
7 values over a limit, 48 required values missing, 2 of 25 reports late

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

Period endingParameterReportedLimitOver by
October 2025Oxygen, dissolved [DO], daily minimum3.92≥ 4 mg/L2%
January 2026Solids, total suspended, daily maximum38≤ 30 mg/L27%
April 2026BOD, 5-day, 20 deg. C, daily maximum> 30≤ 30 mg/L—
April 2026BOD, 5-day, 20 deg. C, monthly average15.5909≤ 15 mg/L4%
April 2026Solids, total suspended, daily maximum31≤ 30 mg/L3%
May 2026Solids, total suspended, daily maximum43≤ 30 mg/L43%
June 2026Solids, total suspended, daily maximum33≤ 30 mg/L10%

Limits in force (21)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimum≥ 4 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 15 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 30 mg/Lall year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 20 mg/Lall year001
Solids, total suspendeddaily maximum≤ 30 mg/Lall year001
Phosphorus, total [as P]monthly average≤ .8 mg/Lall year001
Phosphorus, total [as P]annual averagereport only (lb/yr)all year001
Phosphorus, total [as P]annual maximumreport only (lb/yr)all year001
Chloride [as Cl]weekly average≤ 510 mg/Lall year001
Chloride [as Cl]monthly averagereport only (lb/d)all year001
Chloride [as Cl]monthly maximumreport only (lb/d)all year001
Zinc, total recoverablemonthly average≤ 320 ug/Lall year001
Zinc, total recoverabledaily maximum≤ 320 ug/Lall year001
Zinc, total recoverableweekly average≤ 1.8 lb/dall year001
Zinc, total recoverabledaily maximum≤ 1.7 lb/dall year001
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

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/WI0023981 · MCP: https://passage-data.com/mcp