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Lac Courte Oreilles Reserve WWTP

Sewage treatment plant, Hayward, Wisconsin. NPDES permit WI0073041 expired Oct 25, 2026. Last 12 months: no values over a limit, 226 required values missing, 4 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 21 days after each period: form A quarterly (25 values), form Q quarterly (5 values)
Last report on file
December 2025
Oct 2024 – Sep 2025
0 values over a limit, 78 required values missing, 12 of 16 reports late

Limits in force (30)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year
Oxygen, dissolved [DO]minimumreport only (mg/L)all year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
pHminimumreport only (SU)all year
pHmaximumreport only (SU)all year
Solids, total suspendedmonthly average≤ 60 mg/Lall year
Solids, total suspendedweekly average≤ 90 mg/Lall year
Solids, total suspendedmonthly average≤ 190 lb/dall year
Solids, total suspendedweekly average≤ 285 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Rainfalltotalreport only (in)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
E. coli30-day geometric mean≤ 126 #/100mLMay–Sep
E. colidaily maximum≤ 410 #/100mLMay–Sep
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 79 lb/dall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 127 lb/dall year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carb-5 day, 20 deg C, percent removalminimum value> 85 %all year
Solids, suspended percent removalminimum value> 65 %all year
Outfall observation,visual, y/n responsemonthly averagereport only (Y=0;N=1)all year

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/WI0073041 · MCP: https://passage-data.com/mcp