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St Joseph Sanitary District

Sewage treatment plant, La Crosse, Wisconsin. NPDES permit WI0031186 expired Sep 30, 2025; its limits still apply. Last 12 months: over a limit 10 times (last February 2026), 22 required values missing, 2 of 23 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 21 days after each period: outfall 001 form A monthly (14 values), outfall 001 form Q quarterly (2 values), outfall 701 form A monthly (6 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
5 values over a limit, 2 required values missing, 2 of 28 reports late

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

Period endingParameterReportedLimitOver by
October 2025Coliform, fecal general, geometric mean144.3135≤ 100 #/100mL44%
October 2025Nitrogen, ammonia total [as N], monthly average6.375≤ 1.2 mg/L431%
October 2025Nitrogen, ammonia total [as N], weekly average9.44≤ 3.1 mg/L205%
November 2025Nitrogen, ammonia total [as N], monthly average3.054≤ 1.2 mg/L155%
November 2025Nitrogen, ammonia total [as N], weekly average< 9.44≤ 3.1 mg/L205%
January 2026BOD, 5-day, 20 deg. C, daily maximum> 15≤ 30 mg/L—
January 2026Nitrogen, ammonia total [as N], monthly average1.8975≤ 1.2 mg/L58%
January 2026Nitrogen, ammonia total [as N], weekly average5.38≤ 3.1 mg/L74%
February 2026Nitrogen, ammonia total [as N], monthly average3.5375≤ 1.2 mg/L195%
February 2026Nitrogen, ammonia total [as N], weekly average< 9.56≤ 3.1 mg/L208%

Limits in force (22)

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, total [as N]monthly average≤ 10 mg/Lall year001
Nitrogen, ammonia total [as N]weekly average≤ 3.1 mg/Lall year001
Nitrogen, ammonia total [as N]monthly average≤ 1.2 mg/Lall year001
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 averagereport only (lb/d)all year001
Phosphorus, total [as P]monthly maximumreport only (lb/d)all year001
Chloride [as Cl]weekly average≤ 400 mg/Lall year001
Coliform, fecal generalgeometric mean≤ 100 #/100mLall year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year701
BOD, 5-day, 20 deg. Cmonthly maximumreport only (mg/L)all year701
Solids, total suspendedmonthly averagereport only (mg/L)all year701
Solids, total suspendedmonthly maximumreport only (mg/L)all year701
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year701
Flow, in conduit or thru treatment plantmonthly 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/WI0031186 · MCP: https://passage-data.com/mcp