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Aurora Sanitary District # 1

Sewage treatment plant, Florence, Wisconsin. NPDES permit WI0031852 expired Sep 30, 2023; its limits still apply. Last 12 months: over a limit 8 times (last April 2026), 63 required values missing, 10 of 25 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (10 values), outfall 001 form Q quarterly (1 value), outfall 701 form A monthly (8 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
3 values over a limit, 31 required values missing, 24 of 28 reports late

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

Period endingParameterReportedLimitOver by
January 2026Nitrogen, ammonia total [as N], weekly average35≤ 34 mg/L3%
February 2026BOD, carbonaceous [5 day, 5 C], monthly average28.25≤ 25 mg/L13%
February 2026Nitrogen, ammonia total [as N], monthly average37.25≤ 34 mg/L10%
February 2026Nitrogen, ammonia total [as N], weekly average40≤ 34 mg/L18%
March 2026BOD, carbonaceous [5 day, 5 C], monthly average27≤ 25 mg/L8%
March 2026Nitrogen, ammonia total [as N], monthly average38.25≤ 34 mg/L13%
March 2026Nitrogen, ammonia total [as N], weekly average43≤ 34 mg/L26%
April 2026Nitrogen, ammonia total [as N], weekly average39≤ 34 mg/L15%

Limits in force (19)

ParameterStatisticLimitMonthsOutfall
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 60 mg/Lall year001
Nitrogen, ammonia total [as N]weekly average≤ 34 mg/Lall year001
Nitrogen, ammonia total [as N]monthly average≤ 34 mg/Lall year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]quarterly 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
BOD, carbonaceous [5 day, 5 C]weekly average≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 5 C]monthly average≤ 25 mg/Lall year001
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
BOD, carbonaceous [5 day, 5 C]monthly averagereport only (ug/L)all year701
BOD, carbonaceous [5 day, 5 C]daily maximumreport only (ug/L)all year701

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/WI0031852 · MCP: https://passage-data.com/mcp