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City of Shullsburg

Sewage treatment plant, Shullsburg, Wisconsin. NPDES permit WI0028321 expired Sep 30, 2023; its limits still apply. Last 12 months: over a limit 2 times (last January 2026), 209 required values missing, 6 of 33 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (23 values), outfall 002 form A monthly (12 values), outfall 701 form A monthly (6 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
8 values over a limit, 181 required values missing, 10 of 36 reports late

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

Period endingParameterReportedLimitOver by
October 2025Phosphorus, total [as P], monthly average.1886≤ .18 lb/d5%
January 2026Phosphorus, total [as P], monthly average.2258≤ .18 lb/d25%

Limits in force (53)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimum≥ 6 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 10 mg/LMay–Oct001
BOD, 5-day, 20 deg. Cweekly average≤ 20 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≤ 20 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cweekly average≤ 24 lb/dMay–Oct001
BOD, 5-day, 20 deg. Cweekly average≤ 48 lb/dJan, Feb, Mar, Apr, Nov, Dec001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedweekly average≤ 10 mg/LMay–Oct001
Solids, total suspendedweekly average≤ 20 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Solids, total suspendedmonthly average≤ 10 mg/LMay–Oct001
Solids, total suspendedmonthly average≤ 20 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Solids, total suspendedweekly average≤ 24 lb/dMay–Oct001
Solids, total suspendedweekly average≤ 48 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 11 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 6.7 mg/LApr001
Nitrogen, ammonia total [as N]weekly average≤ 3.1 mg/LMay–Sep001
Nitrogen, ammonia total [as N]monthly average≤ 4.8 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 3 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 1.8 mg/LMay–Sep001
Nitrogen, ammonia total [as N]daily maximum≤ 25 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 25 mg/LApr001
Phosphorus, total [as P]6-month average≤ .075 mg/Lall year001
Phosphorus, total [as P]monthly average≤ .22 mg/Lall year001
Phosphorus, total [as P]monthly average≤ .18 lb/dall year001
Chloride [as Cl]monthly averagereport only (mg/L)all year001
Chloride [as Cl]daily maximumreport only (mg/L)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≤ 7.6 ug/LMay–Sep001
Chlorine, total residualmonthly average≤ 7.6 ug/LMay–Sep001
Chlorine, total residualdaily maximum≤ 26 ug/LMay–Sep001
Coliform, fecal generalweekly geometric mean≤ 656 #/100mLMay–Sep001
Coliform, fecal generalgeometric mean≤ 400 #/100mLMay–Sep001
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year002
Oxygen, dissolved [DO]daily minimum≥ 6 mg/Lall year002
BOD, 5-day, 20 deg. Cweekly average≤ 30 mg/Lall year002
BOD, 5-day, 20 deg. Cmonthly average≤ 20 mg/Lall year002
pHdaily minimum≥ 6 SUall year002
pHdaily maximum≤ 9 SUall year002
Solids, total suspendedweekly average≤ 30 mg/Lall year002
Solids, total suspendedmonthly average≤ 20 mg/Lall year002
Phosphorus, total [as P]monthly average≤ 6 mg/Lall year002
Chloride [as Cl]weekly average≤ 450 mg/Lall year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
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/WI0028321 · MCP: https://passage-data.com/mcp