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City of Portage

Sewage treatment plant, major discharger, Portage, Wisconsin. NPDES permit WI0020427 expired Sep 30, 2021; its limits still apply. Last 12 months: over a limit 9 times (last June 2026), 44 required values missing, 10 of 28 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (17 values), outfall 001 form Q quarterly (4 values), outfall 701 form A monthly (4 values), outfall 701 form Q quarterly (1 value)
Last report on file
June 2026
Oct 2024 – Sep 2025
10 values over a limit, 25 required values missing, 6 of 32 reports late

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

Period endingParameterReportedLimitOver by
October 2025Phosphorus, total [as P], monthly average2159.896≤ 17.5 lb/d12242%
November 2025Phosphorus, total [as P], monthly average2145.383≤ 17.5 lb/d12159%
December 2025Phosphorus, total [as P], monthly average2097.273≤ 17.5 lb/d11884%
January 2026Phosphorus, total [as P], monthly average2119.344≤ 17.5 lb/d12011%
February 2026Phosphorus, total [as P], monthly average2113.679≤ 17.5 lb/d11978%
March 2026Phosphorus, total [as P], monthly average2119.094≤ 17.5 lb/d12009%
April 2026Phosphorus, total [as P], monthly average2138.262≤ 17.5 lb/d12119%
May 2026Phosphorus, total [as P], monthly average2145.797≤ 17.5 lb/d12162%
June 2026Phosphorus, total [as P], monthly average2152.366≤ 17.5 lb/d12199%

Limits in force (26)

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, total [as N]quarterly maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all 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 average≤ 1 mg/Lall year001
Phosphorus, total [as P]monthly average≤ 17.5 lb/dall 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 residualmonthly averagereport only (ug/L)May–Sep001
Chlorine, total residualdaily maximum≤ 38 ug/LMay–Sep001
Mercury, total recoverabledaily maximum≤ 3.1 ng/Lall year001
Coliform, fecal generalgeometric mean≤ 400 #/100mLMay–Sep001
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
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
Mercury, total recoverablequarterly maximumreport only (ng/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/WI0020427 · MCP: https://passage-data.com/mcp