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City of Lake Mills

Sewage treatment plant, major discharger, Lake Mills, Wisconsin. NPDES permit WI0031194 expired Sep 30, 2021; its limits still apply. Last 12 months: no values over a limit, 60 required values missing, 14 of 25 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (22 values), outfall 001 form Q quarterly (3 values), outfall 701 form A monthly (6 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
0 values over a limit, 10 required values missing, 19 of 28 reports late

Limits in force (80)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimum≥ 7 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 10 mg/LMay–Oct001
BOD, 5-day, 20 deg. Cweekly average≤ 14 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmonthly average≤ 10 mg/LMay–Oct001
BOD, 5-day, 20 deg. Cmonthly average≤ 14 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)May–Oct001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cweekly average≤ 80.9 lb/dMay–Oct001
BOD, 5-day, 20 deg. Cweekly average≤ 113 lb/dJan, Feb, Mar, Apr, Nov, Dec001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedweekly average≤ 14 mg/LJan, Mar, Dec001
Solids, total suspendedweekly average≤ 14 mg/LApr, Nov001
Solids, total suspendedweekly average≤ 14 mg/LFeb001
Solids, total suspendedweekly average≤ 10 mg/LMay, Jul, Aug, Oct001
Solids, total suspendedweekly average≤ 10 mg/LJun, Sep001
Solids, total suspendedmonthly average≤ 14 mg/LJan, Mar, Dec001
Solids, total suspendedmonthly average≤ 14 mg/LApr, Nov001
Solids, total suspendedmonthly average≤ 14 mg/LFeb001
Solids, total suspendedmonthly average≤ 10 mg/LMay, Jul, Aug, Oct001
Solids, total suspendedmonthly average≤ 10 mg/LJun, Sep001
Solids, total suspendeddaily maximumreport only (mg/L)Jan, Mar, Dec001
Solids, total suspendeddaily maximumreport only (mg/L)Apr, Nov001
Solids, total suspendeddaily maximumreport only (mg/L)Feb001
Solids, total suspendeddaily maximumreport only (mg/L)May, Jul, Aug, Oct001
Solids, total suspendeddaily maximumreport only (mg/L)Jun, Sep001
Solids, total suspendedmonthly average≤ 83.9 lb/dJan, Mar, Dec001
Solids, total suspendedmonthly average≤ 84 lb/dApr, Nov001
Solids, total suspendedmonthly average≤ 92.1 lb/dFeb001
Solids, total suspendedmonthly average≤ 83.9 lb/dMay, Jul, Aug, Oct001
Solids, total suspendedmonthly average≤ 84 lb/dJun, Sep001
Solids, total suspendedweekly average≤ 113 lb/dJan, Mar, Dec001
Solids, total suspendedweekly average≤ 113 lb/dApr, Nov001
Solids, total suspendedweekly average≤ 113 lb/dFeb001
Solids, total suspendedweekly average≤ 80.9 lb/dMay, Jul, Aug, Oct001
Solids, total suspendedweekly average≤ 80.9 lb/dJun, Sep001
Nitrogen, total [as N]quarterly maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]weekly average≤ 4.3 mg/LMay–Sep001
Nitrogen, ammonia total [as N]weekly average≤ 12 mg/LApr001
Nitrogen, ammonia total [as N]weekly average≤ 11 mg/LJan, Feb, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 11 mg/LOct001
Nitrogen, ammonia total [as N]monthly average≤ 1.6 mg/LMay–Sep001
Nitrogen, ammonia total [as N]monthly average≤ 4.6 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 7.5 mg/LJan, Feb, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 6.8 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 11 mg/LMay–Sep001
Nitrogen, ammonia total [as N]daily maximum≤ 11 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 11 mg/LJan, Feb, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 11 mg/LOct001
Nitrogen, Kjeldahl, total [as N]quarterly maximumreport only (mg/L)all year001
Nitrite + Nitrate total [as N]quarterly maximumreport only (mg/L)all year001
Phosphorus, total [as P]monthly average≤ 1 mg/LAug, Nov001
Phosphorus, total [as P]monthly average≤ 1 mg/LDec001
Phosphorus, total [as P]monthly average≤ 1 mg/LJan, Jul, Oct001
Phosphorus, total [as P]monthly average≤ 1 mg/LFeb001
Phosphorus, total [as P]monthly average≤ 1 mg/LMar001
Phosphorus, total [as P]monthly average≤ 1 mg/LApr001
Phosphorus, total [as P]monthly average≤ 1 mg/LMay001
Phosphorus, total [as P]monthly average≤ 1 mg/LJun001
Phosphorus, total [as P]monthly average≤ 1 mg/LSep001
Phosphorus, total [as P]monthly average≤ 21.5 lb/dAug, Nov001
Phosphorus, total [as P]monthly average≤ 19.6 lb/dDec001
Phosphorus, total [as P]monthly average≤ 22 lb/dJan, Jul, Oct001
Phosphorus, total [as P]monthly average≤ 28.6 lb/dFeb001
Phosphorus, total [as P]monthly average≤ 25.2 lb/dMar001
Phosphorus, total [as P]monthly average≤ 26 lb/dApr001
Phosphorus, total [as P]monthly average≤ 26.1 lb/dMay001
Phosphorus, total [as P]monthly average≤ 27.9 lb/dJun001
Phosphorus, total [as P]monthly average≤ 22.7 lb/dSep001
Chlorine, total residualweekly average≤ 14 ug/LMay–Sep001
Chlorine, total residualmonthly average≤ 14 ug/LMay–Sep001
Chlorine, total residualdaily maximum≤ 38 ug/LMay–Sep001
Coliform, fecal generalweekly average≤ 780 #/100mLMay–Sep001
Coliform, fecal generalgeometric mean≤ 400 #/100mLMay–Sep001
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/WI0031194 · MCP: https://passage-data.com/mcp