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City of Cornell

Sewage treatment plant, Cornell, Wisconsin. NPDES permit WI0021300 expired Sep 30, 2023; its limits still apply. Last 12 months: over a limit 18 times (last April 2026), 62 required values missing, 16 of 22 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (12 values), outfall 701 form A monthly (8 values)
Last report on file
May 2026
Oct 2024 – Sep 2025
11 values over a limit, 46 required values missing, 18 of 24 reports late

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

All 18 values over a limit
Period endingParameterReportedLimitOver by
November 2025Copper, total recoverable, daily maximum38≤ 37 ug/L3%
November 2025Copper, total recoverable, monthly average38≤ 37 ug/L3%
November 2025Copper, total recoverable, weekly average38≤ 37 ug/L3%
December 2025Copper, total recoverable, daily maximum60≤ 37 ug/L62%
December 2025Copper, total recoverable, monthly average60≤ 37 ug/L62%
December 2025Copper, total recoverable, weekly average60≤ 37 ug/L62%
January 2026Copper, total recoverable, daily maximum61≤ 37 ug/L65%
January 2026Copper, total recoverable, monthly average61≤ 37 ug/L65%
January 2026Copper, total recoverable, weekly average61≤ 37 ug/L65%
February 2026Copper, total recoverable, daily maximum52≤ 37 ug/L41%
February 2026Copper, total recoverable, monthly average52≤ 37 ug/L41%
February 2026Copper, total recoverable, weekly average52≤ 37 ug/L41%
March 2026Copper, total recoverable, daily maximum45≤ 37 ug/L22%
March 2026Copper, total recoverable, monthly average45≤ 37 ug/L22%
March 2026Copper, total recoverable, weekly average45≤ 37 ug/L22%
April 2026Copper, total recoverable, daily maximum124≤ 37 ug/L235%
April 2026Copper, total recoverable, monthly average124≤ 37 ug/L235%
April 2026Copper, total recoverable, weekly average124≤ 37 ug/L235%

Limits in force (22)

ParameterStatisticLimitMonthsOutfall
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
Nitrogen, ammonia total [as N]weekly average≤ 46 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 46 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Copper, total recoverableweekly average≤ 37 ug/Lall year001
Copper, total recoverablemonthly average≤ 37 ug/Lall year001
Copper, total recoverabledaily maximum≤ 37 ug/Lall year001
Copper, total recoverabledaily maximum≤ .41 lb/dall year001
Coliform, fecal generalweekly geometric mean≤ 656 #/100mLMay–Sep001
Coliform, fecal generalgeometric mean≤ 400 #/100mLMay–Sep001
BOD, carbonaceous [5 day, 5 C]weekly average≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 5 C]monthly average≤ 25 mg/Lall 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
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year701
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year701
BOD, carbonaceous [5 day, 5 C]monthly averagereport only (mg/L)all year701
BOD, carbonaceous [5 day, 5 C]daily 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/WI0021300 · MCP: https://passage-data.com/mcp