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City of Oshkosh

Sewage treatment plant, major discharger, Oshkosh, Wisconsin. NPDES permit WI0025038 expired Dec 31, 2023; its limits still apply. Last 12 months: over a limit 9 times (last June 2026), 117 required values missing, 10 of 37 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (25 values), outfall 001 form Q quarterly (1 value), outfall 701 form A monthly (15 values), outfall 701 form Q quarterly (1 value)
Last report on file
June 2026
Oct 2024 – Sep 2025
12 values over a limit, 40 required values missing, 6 of 44 reports late

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

Period endingParameterReportedLimitOver by
October 2025Phosphorus, total [as P], monthly average.2625≤ .12 mg/L119%
November 2025Phosphorus, total [as P], monthly average.4039≤ .12 mg/L237%
December 2025Phosphorus, total [as P], monthly average.4041≤ .12 mg/L237%
January 2026Phosphorus, total [as P], monthly average.4205≤ .12 mg/L250%
February 2026Phosphorus, total [as P], monthly average.2929≤ .12 mg/L144%
March 2026Phosphorus, total [as P], monthly average.2064≤ .12 mg/L72%
April 2026Phosphorus, total [as P], monthly average.1537≤ .12 mg/L28%
May 2026Phosphorus, total [as P], monthly average.245≤ .12 mg/L104%
June 2026Phosphorus, total [as P], monthly average.3286≤ .12 mg/L174%

Limits in force (50)

ParameterStatisticLimitMonthsOutfall
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendeddaily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]weekly average≤ 92 mg/LJan–Mar001
Nitrogen, ammonia total [as N]weekly average≤ 35 mg/LApr, May001
Nitrogen, ammonia total [as N]weekly average≤ 67 mg/LNov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 38 mg/LJan–Mar001
Nitrogen, ammonia total [as N]monthly average≤ 23 mg/LApr, May001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Jun–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 39 mg/LNov, Dec001
Phosphorus, total [as P]monthly average≤ .12 mg/Lall year001
Phosphorus, total [as P]monthly averagereport only (lb/d)all year001
Nickel, total recoverabledaily maximumreport only (ug/L)all year001
Zinc, total recoverabledaily maximumreport only (ug/L)all year001
Cadmium, total recoverabledaily maximumreport only (ug/L)all year001
Lead, total recoverabledaily maximumreport only (ug/L)all year001
Chromium, total recoverabledaily maximumreport only (ug/L)all year001
Copper, total recoverabledaily maximumreport only (ug/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≤ 38 ug/Lall year001
Chlorine, total residualmonthly average≤ 38 ug/Lall year001
Chlorine, total residualdaily maximum≤ 38 ug/Lall year001
Mercury, total recoverabledaily maximum≤ 3.6 ng/Lall year001
Mercury, total recoverabledaily maximum≤ 3.6 ng/Lall year001
Coliform, fecal generalweekly geometric mean≤ 656 #/100mLall year001
Coliform, fecal generalgeometric mean≤ 400 #/100mLall 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, carbonaceous [5 day, 5 C]daily maximumreport only (mg/L)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year003
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year003
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
Nickel, total recoverabledaily maximumreport only (ug/L)all year701
Zinc, total recoverabledaily maximumreport only (ug/L)all year701
Cadmium, total recoverabledaily maximumreport only (ug/L)all year701
Lead, total recoverabledaily maximumreport only (ug/L)all year701
Chromium, total recoverabledaily maximumreport only (ug/L)all year701
Copper, total recoverabledaily maximumreport only (ug/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
Mercury, total recoverabledaily maximumreport only (ng/L)all year701
Mercury, total recoverablequarterly maximumreport only (ng/L)all year701
BOD, carbonaceous [5 day, 5 C]monthly averagereport only (mg/L)all year701
BOD, carbonaceous [5 day, 5 C]daily 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/WI0025038 · MCP: https://passage-data.com/mcp