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City of Eau Claire

Sewage treatment plant, major discharger, Eau Claire, Wisconsin. NPDES permit WI0023850 expired Mar 31, 2023; its limits still apply. Last 12 months: no values over a limit, 86 required values missing, 8 of 25 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (26 values), outfall 001 form Q quarterly (3 values), outfall 702 form A monthly (15 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
0 values over a limit, 10 required values missing, 12 of 28 reports late

Limits in force (44)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year001
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]weekly average≤ 29 mg/Lall year001
Nitrogen, ammonia total [as N]monthly average≤ 29 mg/Lall year001
Nitrogen, ammonia total [as N]daily maximum≤ 29 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 average≤ 1 mg/Lall year001
Cyanide, total [as CN]daily maximumreport only (ug/L)all year001
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year001
Nickel, total recoverabledaily maximumreport only (ug/L)all year001
Silver 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
Copper, total recoverabledaily maximumreport only (ug/L)all year001
Chlorine, total residualweekly average≤ 38 ug/LMay–Sep001
Chlorine, total residualmonthly average≤ 38 ug/LMay–Sep001
Chlorine, total residualdaily maximum≤ 38 ug/LMay–Sep001
Mercury, total recoverabledaily maximumreport only (ng/L)all year001
Coliform, fecal generalweekly geometric mean≤ 780 #/100mLMay–Sep001
Coliform, fecal generalgeometric mean≤ 400 #/100mLMay–Sep001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year702
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year702
Solids, total suspendedmonthly averagereport only (mg/L)all year702
Solids, total suspendeddaily maximumreport only (mg/L)all year702
Cyanide, total [as CN]daily maximumreport only (ug/L)all year702
Nickel, total recoverabledaily maximumreport only (ug/L)all year702
Silver total recoverabledaily maximumreport only (ug/L)all year702
Zinc, total recoverabledaily maximumreport only (ug/L)all year702
Cadmium, total recoverabledaily maximumreport only (ug/L)all year702
Lead, total recoverabledaily maximumreport only (ug/L)all year702
Chromium, total recoverabledaily maximumreport only (ug/L)all year702
Copper, total recoverabledaily maximumreport only (ug/L)all year702
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year702
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year702
Mercury, total recoverabledaily maximumreport only (ng/L)all year702

How strict are these limits?

Cited limits by parameter: Wisconsin's rules and the federal ones.

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Your permit document is the final word. As JSON: /api/v1/permits/WI0023850 · MCP: https://passage-data.com/mcp