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Black Creek Wastewater Treatme

Sewage treatment plant, Black Creek, Wisconsin. NPDES permit WI0021041 expired Jun 30, 2022; its limits still apply. Last 12 months: over a limit 11 times (last May 2026), 38 required values missing, 12 of 22 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (13 values), outfall 701 form A monthly (6 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
5 values over a limit, 0 required values missing, 10 of 24 reports late

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

Period endingParameterReportedLimitOver by
October 2025BOD, 5-day, 20 deg. C, daily maximum33≤ 30 mg/L10%
March 2026BOD, 5-day, 20 deg. C, daily maximum42≤ 30 mg/L40%
March 2026Nitrogen, ammonia total [as N], daily maximum70≤ 6.2 mg/L1029%
March 2026Nitrogen, ammonia total [as N], monthly average5.7207≤ 3.3 mg/L73%
March 2026Nitrogen, ammonia total [as N], weekly average23.45≤ 6.7 mg/L250%
April 2026BOD, 5-day, 20 deg. C, daily maximum31≤ 30 mg/L3%
April 2026BOD, 5-day, 20 deg. C, monthly average18.7692≤ 15 mg/L25%
April 2026Solids, total suspended, daily maximum34≤ 30 mg/L13%
May 2026BOD, 5-day, 20 deg. C, daily maximum44≤ 30 mg/L47%
May 2026BOD, 5-day, 20 deg. C, monthly average18.3≤ 15 mg/L22%
May 2026Nitrogen, ammonia total [as N], daily maximum7.8≤ 6.2 mg/L26%

Limits in force (46)

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
Nitrogen, ammonia total [as N]weekly average≤ 4.6 mg/LJul001
Nitrogen, ammonia total [as N]weekly average≤ 4.6 mg/LAug001
Nitrogen, ammonia total [as N]weekly average≤ 6.7 mg/LMar, Oct001
Nitrogen, ammonia total [as N]weekly average≤ 12 mg/LNov001
Nitrogen, ammonia total [as N]weekly average≤ 11 mg/LDec001
Nitrogen, ammonia total [as N]weekly average≤ 6.6 mg/LJan, Feb001
Nitrogen, ammonia total [as N]weekly average≤ 5.7 mg/LApr001
Nitrogen, ammonia total [as N]weekly average≤ 5.8 mg/LMay001
Nitrogen, ammonia total [as N]weekly average≤ 5.8 mg/LJun001
Nitrogen, ammonia total [as N]weekly average≤ 6 mg/LSep001
Nitrogen, ammonia total [as N]monthly average≤ 2.5 mg/LJul001
Nitrogen, ammonia total [as N]monthly average≤ 2.3 mg/LAug001
Nitrogen, ammonia total [as N]monthly average≤ 3.3 mg/LMar, Oct001
Nitrogen, ammonia total [as N]monthly average≤ 6.6 mg/LNov001
Nitrogen, ammonia total [as N]monthly average≤ 5.3 mg/LDec001
Nitrogen, ammonia total [as N]monthly average≤ 2.8 mg/LJan, Feb001
Nitrogen, ammonia total [as N]monthly average≤ 2.3 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 2.6 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 5.8 mg/LJun001
Nitrogen, ammonia total [as N]monthly average≤ 3.5 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 6.2 mg/LJul001
Nitrogen, ammonia total [as N]daily maximum≤ 6.2 mg/LAug001
Nitrogen, ammonia total [as N]daily maximum≤ 6.2 mg/LMar, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 6.2 mg/LNov001
Nitrogen, ammonia total [as N]daily maximum≤ 6.2 mg/LDec001
Nitrogen, ammonia total [as N]daily maximum≤ 6.2 mg/LJan, Feb001
Nitrogen, ammonia total [as N]daily maximum≤ 6.2 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 6.2 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 6.2 mg/LJun001
Nitrogen, ammonia total [as N]daily maximum≤ 6.2 mg/LSep001
Phosphorus, total [as P]monthly average≤ 1 mg/Lall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all 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

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/WI0021041 · MCP: https://passage-data.com/mcp