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City of Independence

Sewage treatment plant, Independence, Wisconsin. NPDES permit WI0024287 expired Sep 30, 2024; its limits still apply. Last 12 months: over a limit 6 times (last June 2026), 70 required values missing, 2 of 24 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 21 days after each period: outfall 004 form A monthly (18 values), outfall 004 form Q quarterly (1 value), outfall 702 form A monthly (6 values), outfall 004 form AN yearly
Last report on file
June 2026
Oct 2024 – Sep 2025
2 values over a limit, 22 required values missing, 0 of 29 reports late

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

Period endingParameterReportedLimitOver by
March 2026Copper, total recoverable, daily maximum23.4≤ 23 ug/L2%
March 2026Copper, total recoverable, weekly average23.4≤ 23 ug/L2%
April 2026Copper, total recoverable, daily maximum25.1≤ 23 ug/L9%
April 2026Copper, total recoverable, weekly average25.1≤ 23 ug/L9%
June 2026Copper, total recoverable, daily maximum29.8≤ 23 ug/L30%
June 2026Copper, total recoverable, weekly average29.8≤ 23 ug/L30%

Limits in force (27)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year004
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year004
pHdaily minimum≥ 6 SUall year004
pHdaily maximum≤ 9 SUall year004
Solids, total suspendedweekly average≤ 45 mg/Lall year004
Solids, total suspendedmonthly average≤ 30 mg/Lall year004
Phosphorus, total [as P]annual averagereport only (lb/yr)all year004
Phosphorus, total [as P]monthly averagereport only (lb/mo)all year004
Phosphorus, total [as P]annual maximumreport only (lb/yr)all year004
Phosphorus, total [as P]monthly maximumreport only (lb/mo)all year004
Hardness, total [as CaCO3]quarterly maximumreport only (mg/L)all year004
Zinc, total recoverableweekly average≤ 185 ug/Lall year004
Zinc, total recoverablemonthly average≤ 185 ug/Lall year004
Zinc, total recoverabledaily maximum≤ 185 ug/Lall year004
Zinc, total recoverabledaily maximum≤ 1.28 lb/dall year004
Copper, total recoverableweekly average≤ 23 ug/Lall year004
Copper, total recoverablemonthly average≤ 23 ug/Lall year004
Copper, total recoverabledaily maximum≤ 23 ug/Lall year004
Copper, total recoverabledaily maximum≤ .071 lb/dall year004
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year004
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all year004
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year702
BOD, 5-day, 20 deg. Cmonthly maximumreport only (mg/L)all year702
Solids, total suspendedmonthly averagereport only (mg/L)all year702
Solids, total suspendedmonthly maximumreport only (mg/L)all year702
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year702
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all year702

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/WI0024287 · MCP: https://passage-data.com/mcp