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City of Horicon

Sewage treatment plant, Horicon, Wisconsin. NPDES permit WI0020231 expired Dec 31, 2023; its limits still apply. Last 12 months: over a limit 2 times (last March 2026), 54 required values missing, 6 of 23 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (21 values), outfall 701 form A monthly (4 values), outfall 001 form AN yearly
Last report on file
June 2026
Oct 2024 – Sep 2025
1 value over a limit, 10 required values missing, 10 of 25 reports late

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

Period endingParameterReportedLimit
February 2026BOD, 5-day, 20 deg. C, weekly average> 29.5≤ 170 lb/d
March 2026BOD, 5-day, 20 deg. C, weekly average> 20≤ 35 mg/L

Limits in force (56)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimum≥ 6 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 35 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cweekly average≤ 21 mg/LMay–Oct001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmonthly average≤ 21 mg/LMay–Oct001
BOD, 5-day, 20 deg. Cweekly average≤ 170 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cweekly average≤ 102 lb/dMay–Oct001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedweekly average≤ 35 mg/LJan, Mar, Apr, Nov, Dec001
Solids, total suspendedweekly average≤ 35 mg/LFeb001
Solids, total suspendedweekly average≤ 21 mg/LMay, Jun, Oct001
Solids, total suspendedweekly average≤ 21 mg/LJul001
Solids, total suspendedweekly average≤ 21 mg/LAug001
Solids, total suspendedweekly average≤ 21 mg/LSep001
Solids, total suspendedmonthly average≤ 30 mg/LJan, Mar, Apr, Nov, Dec001
Solids, total suspendedmonthly average≤ 30 mg/LFeb001
Solids, total suspendedmonthly average≤ 21 mg/LMay, Jun, Oct001
Solids, total suspendedmonthly average≤ 21 mg/LJul001
Solids, total suspendedmonthly average≤ 21 mg/LAug001
Solids, total suspendedmonthly average≤ 21 mg/LSep001
Solids, total suspendedmonthly average≤ 101 lb/dJan, Mar, Apr, Nov, Dec001
Solids, total suspendedmonthly average≤ 109 lb/dFeb001
Solids, total suspendedmonthly average≤ 101 lb/dMay, Jun, Oct001
Solids, total suspendedmonthly average≤ 67 lb/dJul001
Solids, total suspendedmonthly average≤ 42 lb/dAug001
Solids, total suspendedmonthly average≤ 67 lb/dSep001
Solids, total suspendedweekly average≤ 142 lb/dJan, Mar, Apr, Nov, Dec001
Solids, total suspendedweekly average≤ 153 lb/dFeb001
Solids, total suspendedweekly average≤ 142 lb/dMay, Jun, Oct001
Solids, total suspendedweekly average≤ 95 lb/dJul001
Solids, total suspendedweekly average≤ 59 lb/dAug001
Solids, total suspendedweekly average≤ 94 lb/dSep001
Nitrogen, ammonia total [as N]weekly average≤ 19 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 12 mg/LApr001
Nitrogen, ammonia total [as N]weekly average≤ 11 mg/LMay–Sep001
Nitrogen, ammonia total [as N]monthly average≤ 18 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 11 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 14 mg/LMay–Sep001
Nitrogen, ammonia total [as N]daily maximum≤ 20 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 20 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 20 mg/LMay–Sep001
Phosphorus, total [as P]monthly average≤ .8 mg/Lall year001
Phosphorus, total [as P]annual averagereport only (lb/yr)all year001
Phosphorus, total [as P]annual maximumreport only (lb/yr)all 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
Chlorine, total residualweekly average≤ 20 ug/LMay–Sep001
Chlorine, total residualmonthly average≤ 20 ug/LMay–Sep001
Chlorine, total residualdaily maximum≤ 38 ug/LMay–Sep001
Coliform, fecal generalweekly geometric mean≤ 656 #/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

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/WI0020231 · MCP: https://passage-data.com/mcp