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Elk Mound Wastewater Treatment

Sewage treatment plant, Elk Mound, Wisconsin. NPDES permit WI0023914 expired Sep 30, 2024; its limits still apply. Last 12 months: over a limit 3 times (last February 2026), 50 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 002 form A monthly (16 values), outfall 701 form A monthly (4 values), outfall 701 form Q quarterly (1 value)
Last report on file
June 2026
Oct 2024 – Sep 2025
13 values over a limit, 20 required values missing, 0 of 28 reports late

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

Period endingParameterReportedLimitOver by
January 2026BOD, 5-day, 20 deg. C, daily maximum35≤ 30 mg/L17%
January 2026BOD, 5-day, 20 deg. C, monthly average23.25≤ 15 mg/L55%
February 2026BOD, 5-day, 20 deg. C, monthly average17.9167≤ 15 mg/L19%

Limits in force (21)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimum≥ 4 mg/Lall year002
BOD, 5-day, 20 deg. Cmonthly average≤ 15 mg/Lall year002
BOD, 5-day, 20 deg. Cdaily maximum≤ 30 mg/Lall year002
pHdaily minimum≥ 6 SUall year002
pHdaily maximum≤ 9 SUall year002
Solids, total suspendedmonthly average≤ 20 mg/Lall year002
Solids, total suspendeddaily maximum≤ 30 mg/Lall year002
Phosphorus, total [as P]monthly average≤ 7.7 mg/Lall year002
Zinc, total recoverableweekly average≤ 120 ug/Lall year002
Zinc, total recoverablemonthly average≤ 120 ug/Lall year002
Zinc, total recoverabledaily maximum≤ 120 ug/Lall year002
Zinc, total recoverabledaily maximum≤ .51 lb/dall year002
Copper, total recoverableweekly average≤ 24 ug/Lall year002
Copper, total recoverabledaily maximum≤ 34 ug/Lall year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all year002
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
Copper, total recoverablequarterly maximumreport only (ug/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/WI0023914 · MCP: https://passage-data.com/mcp