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SUN PRAIRIE City of

Sewage treatment plant, major discharger, Sun Prairie, Wisconsin. NPDES permit WI0020478 expired Sep 30, 2023; its limits still apply. Last 12 months: no values over a limit, 67 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (21 values), outfall 001 form Q quarterly (4 values), outfall 701 form A monthly (6 values), outfall 701 form Q quarterly (1 value)
Last report on file
June 2026
Oct 2024 – Sep 2025
0 values over a limit, 22 required values missing, 2 of 32 reports late

Limits in force (55)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimum≥ 7 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 10 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cweekly average≤ 5 mg/LMay–Oct001
BOD, 5-day, 20 deg. Cmonthly average≤ 10 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmonthly average≤ 5 mg/LMay–Oct001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 10 mg/LSep001
Solids, total suspendedmonthly average≤ 10 mg/LAug001
Solids, total suspendedmonthly average≤ 10 mg/LJul001
Solids, total suspendedmonthly average≤ 10 mg/LFeb001
Solids, total suspendedmonthly average≤ 10 mg/LJan, Mar, May, Oct, Dec001
Solids, total suspendedmonthly average≤ 10 mg/LApr, Jun, Nov001
Solids, total suspendedmonthly average≤ 191 lb/dSep001
Solids, total suspendedmonthly average≤ 191 lb/dAug001
Solids, total suspendedmonthly average≤ 228 lb/dJul001
Solids, total suspendedmonthly average≤ 277 lb/dFeb001
Solids, total suspendedmonthly average≤ 250 lb/dJan, Mar, May, Oct, Dec001
Solids, total suspendedmonthly average≤ 259 lb/dApr, Jun, Nov001
Solids, total suspendedweekly average≤ 253 lb/dSep001
Solids, total suspendedweekly average≤ 252 lb/dAug001
Solids, total suspendedweekly average≤ 301 lb/dJul001
Solids, total suspendedweekly average≤ 366 lb/dFeb001
Solids, total suspendedweekly average≤ 330 lb/dJan, Mar, May, Oct, Dec001
Solids, total suspendedweekly average≤ 342 lb/dApr, Jun, Nov001
Nitrogen, total [as N]quarterly maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]weekly average≤ 2.8 mg/LMay–Sep001
Nitrogen, ammonia total [as N]weekly average≤ 6.6 mg/LApr001
Nitrogen, ammonia total [as N]weekly average≤ 11 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 1.1 mg/LMay–Sep001
Nitrogen, ammonia total [as N]monthly average≤ 2.8 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 4.5 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)May–Sep001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Apr001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jan, Feb, Mar, Oct, Nov, Dec001
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]6-month average≤ .075 mg/Lall year001
Phosphorus, total [as P]monthly average≤ .225 mg/Lall year001
Phosphorus, total [as P]monthly averagereport only (lb/d)all year001
Phosphorus, total [as P]daily maximumreport only (lb/d)all year001
Chloride [as Cl]weekly average≤ 500 mg/Lall year001
Chloride [as Cl]weekly average≤ 14500 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
Mercury, total recoverablequarterly 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 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
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 recoverablequarterly 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/WI0020478 · MCP: https://passage-data.com/mcp