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Waukesha City

Sewage treatment plant, major discharger, Waukesha, Wisconsin. NPDES permit WI0029971 expired Jun 30, 2018; its limits still apply. Last 12 months: over a limit 2 times (last April 2026), 149 required values missing, 16 of 22 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (21 values), outfall 702 form A monthly (13 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
0 values over a limit, 103 required values missing, 18 of 24 reports late

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

Period endingParameterReportedLimitOver by
February 2026Oxygen, dissolved [DO], minimum5.97≥ 7 mg/L15%
April 2026BOD, 5-day, 20 deg. C, weekly average< 10.8429≤ 10 mg/L8%

Limits in force (67)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)Jan, Feb, Mar, Apr, Oct, Nov, Dec001
Oxygen, dissolved [DO]minimum≥ 7 mg/LJan, Feb, Mar, Apr, May, Jun, Jul, Aug, Oct, Nov, Dec001
Oxygen, dissolved [DO]minimum≥ 6.7 mg/LSep001
BOD, 5-day, 20 deg. Cweekly average≤ 8.5 mg/LJul, Aug001
BOD, 5-day, 20 deg. Cweekly average≤ 10 mg/LJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec001
BOD, 5-day, 20 deg. Cweekly average≤ 8.2 mg/LSep001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedweekly average≤ 10 mg/Lall year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Solids, total suspendeddaily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]weekly average≤ 12 mg/LDec001
Nitrogen, ammonia total [as N]weekly average≤ 12 mg/LFeb001
Nitrogen, ammonia total [as N]weekly average≤ 13 mg/LMar001
Nitrogen, ammonia total [as N]weekly average≤ 11 mg/LJan001
Nitrogen, ammonia total [as N]weekly average≤ 3.9 mg/LJul001
Nitrogen, ammonia total [as N]weekly average≤ 5.8 mg/LSep001
Nitrogen, ammonia total [as N]weekly average≤ 4.2 mg/LAug001
Nitrogen, ammonia total [as N]weekly average≤ 10 mg/LApr001
Nitrogen, ammonia total [as N]weekly average≤ 5.6 mg/LJun001
Nitrogen, ammonia total [as N]weekly average≤ 8.5 mg/LMay001
Nitrogen, ammonia total [as N]weekly average≤ 12 mg/LNov001
Nitrogen, ammonia total [as N]weekly average≤ 10 mg/LOct001
Nitrogen, ammonia total [as N]monthly average≤ 5.1 mg/LDec001
Nitrogen, ammonia total [as N]monthly average≤ 5.2 mg/LFeb001
Nitrogen, ammonia total [as N]monthly average≤ 6 mg/LMar001
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/LJan001
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/LJul001
Nitrogen, ammonia total [as N]monthly average≤ 2.9 mg/LSep001
Nitrogen, ammonia total [as N]monthly average≤ 2.1 mg/LAug001
Nitrogen, ammonia total [as N]monthly average≤ 5.6 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 3.1 mg/LJun001
Nitrogen, ammonia total [as N]monthly average≤ 4.9 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 5.4 mg/LNov001
Nitrogen, ammonia total [as N]monthly average≤ 4.5 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 24 mg/LDec001
Nitrogen, ammonia total [as N]daily maximum≤ 24 mg/LFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 24 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 24 mg/LJan001
Nitrogen, ammonia total [as N]daily maximum≤ 24 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 24 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 24 mg/LNov001
Phosphorus, total [as P]monthly average≤ .7 mg/Lall year001
Chloride [as Cl]weekly average≤ 690 mg/Lall 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
Mercury, total recoverabledaily maximumreport only (ng/L)all year001
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
Nickel, 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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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/WI0029971 · MCP: https://passage-data.com/mcp