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Madison Metropolitan Sewerage

Sewage treatment plant, major discharger, Madison, Wisconsin. NPDES permit WI0024597 expired Sep 30, 2015; its limits still apply. Last 12 months: over a limit once (last April 2026), 193 required values missing, 22 of 33 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (29 values), outfall 005 form A monthly (18 values), outfall 701 form A monthly (13 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
0 values over a limit, 60 required values missing, 33 of 36 reports late

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

Period endingParameterReportedLimitOver by
April 2026Oxygen, dissolved [DO], daily minimum4.9≥ 5 mg/L2%

Limits in force (71)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimum≥ 5 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 20 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 19 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 7923 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 8340 lb/dall year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedweekly average≤ 23 mg/Lall year001
Solids, total suspendedmonthly average≤ 20 mg/Lall year001
Solids, total suspendeddaily maximumreport only (mg/L)all year001
Solids, total suspendedweekly average≤ 8340 lb/dall year001
Solids, total suspendedmonthly average≤ 9591 lb/dall year001
Nitrogen, ammonia total [as N]weekly average≤ 4.4 mg/LMay–Sep001
Nitrogen, ammonia total [as N]weekly average≤ 10 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 1.8 mg/LMay–Sep001
Nitrogen, ammonia total [as N]monthly average≤ 4.1 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 17 mg/LMay–Sep001
Nitrogen, ammonia total [as N]daily maximum≤ 17 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec001
Phosphorus, total [as P]monthly average≤ 1.5 mg/Lall year001
Chloride [as Cl]weekly average≤ 481 mg/Lall year001
Chloride [as Cl]weekly average≤ 200000 lb/dall 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 maximum≤ 5.7 ng/Lall year001
Coliform, fecal generalgeometric mean≤ 400 #/100mLApr–Oct001
Oxygen, dissolved [DO]daily minimum≥ 5 mg/Lall year005
BOD, 5-day, 20 deg. Cweekly average≤ 16 mg/LJan, Feb, Mar, Apr, Nov, Dec005
BOD, 5-day, 20 deg. Cweekly average≤ 7 mg/LMay–Oct005
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec005
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)May–Oct005
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec005
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)May–Oct005
pHdaily minimum≥ 6 SUall year005
pHdaily maximum≤ 9 SUall year005
Solids, total suspendedmonthly average≤ 10 mg/LMay–Oct005
Solids, total suspendedmonthly average≤ 16 mg/LJan, Feb, Mar, Apr, Nov, Dec005
Solids, total suspendeddaily maximumreport only (mg/L)May–Oct005
Solids, total suspendeddaily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec005
Nitrogen, ammonia total [as N]weekly average≤ 8.7 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec005
Nitrogen, ammonia total [as N]weekly average≤ 2.6 mg/LMay–Sep005
Nitrogen, ammonia total [as N]monthly average≤ 3.8 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec005
Nitrogen, ammonia total [as N]monthly average≤ 1.1 mg/LMay–Sep005
Nitrogen, ammonia total [as N]daily maximum≤ 11 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec005
Nitrogen, ammonia total [as N]daily maximum≤ 11 mg/LMay–Sep005
Phosphorus, total [as P]monthly average≤ 1.5 mg/Lall year005
Chloride [as Cl]weekly average≤ 481 mg/Lall year005
Chloride [as Cl]weekly average≤ 14000 lb/dall year005
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year005
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year005
Mercury, total recoverabledaily maximum≤ 5.7 ng/Lall year005
Coliform, fecal generalgeometric mean≤ 400 #/100mLApr–Oct005
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

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/WI0024597 · MCP: https://passage-data.com/mcp