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Fontana Walworth Water Pollution Cont. Comm

Sewage treatment plant, major discharger, Walworth, Wisconsin. NPDES permit WI0036021 expired Dec 31, 2023; its limits still apply. Last 12 months: over a limit 6 times (last June 2026), 111 required values missing, 6 of 28 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (24 values), outfall 001 form Q quarterly (4 values), outfall 701 form A monthly (7 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
8 values over a limit, 70 required values missing, 14 of 32 reports late

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

Period endingParameterReportedLimitOver by
October 2025Chloride [as Cl], weekly average676.6667≤ 560 mg/L21%
November 2025Chloride [as Cl], weekly average651.25≤ 560 mg/L16%
December 2025Chloride [as Cl], weekly average571.6667≤ 560 mg/L2%
February 2026Chloride [as Cl], weekly average633.75≤ 560 mg/L13%
May 2026Chloride [as Cl], weekly average575≤ 560 mg/L3%
June 2026Chloride [as Cl], weekly average575≤ 560 mg/L3%

Limits in force (68)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimum≥ 7 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 10 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec001
BOD, 5-day, 20 deg. Cweekly average≤ 8.8 mg/LMay001
BOD, 5-day, 20 deg. Cweekly average≤ 7.3 mg/LJun001
BOD, 5-day, 20 deg. Cweekly average≤ 7.2 mg/LJul, Aug001
BOD, 5-day, 20 deg. Cweekly average≤ 7.9 mg/LSep001
BOD, 5-day, 20 deg. Cmonthly average≤ 10 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec001
BOD, 5-day, 20 deg. Cmonthly average≤ 8.8 mg/LMay001
BOD, 5-day, 20 deg. Cmonthly average≤ 7.3 mg/LJun001
BOD, 5-day, 20 deg. Cmonthly average≤ 7.2 mg/LJul, Aug001
BOD, 5-day, 20 deg. Cmonthly average≤ 7.9 mg/LSep001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedweekly average≤ 10 mg/Lall year001
Solids, total suspendedmonthly average≤ 10 mg/Lall year001
Nitrogen, total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, total [as N]quarterly maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]weekly average≤ 11 mg/LJan, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 11 mg/LFeb, Mar, Nov001
Nitrogen, ammonia total [as N]weekly average≤ 6.9 mg/LApr001
Nitrogen, ammonia total [as N]weekly average≤ 5.2 mg/LMay001
Nitrogen, ammonia total [as N]weekly average≤ 4 mg/LJun001
Nitrogen, ammonia total [as N]weekly average≤ 3.4 mg/LJul001
Nitrogen, ammonia total [as N]weekly average≤ 3.5 mg/LAug001
Nitrogen, ammonia total [as N]weekly average≤ 4.9 mg/LSep001
Nitrogen, ammonia total [as N]weekly average≤ 9.7 mg/LOct001
Nitrogen, ammonia total [as N]monthly average≤ 4.5 mg/LJan, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 4.6 mg/LFeb, Mar, Nov001
Nitrogen, ammonia total [as N]monthly average≤ 2.9 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 2.4 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/LJun001
Nitrogen, ammonia total [as N]monthly average≤ 1.6 mg/LJul001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LAug001
Nitrogen, ammonia total [as N]monthly average≤ 2.3 mg/LSep001
Nitrogen, ammonia total [as N]monthly average≤ 4 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 17 mg/LJan, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 17 mg/LFeb, Mar, Nov001
Nitrogen, ammonia total [as N]daily maximum≤ 17 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 17 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 17 mg/LJun001
Nitrogen, ammonia total [as N]daily maximum≤ 17 mg/LJul001
Nitrogen, ammonia total [as N]daily maximum≤ 17 mg/LAug001
Nitrogen, ammonia total [as N]daily maximum≤ 17 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 17 mg/LOct001
Nitrogen, Kjeldahl, 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]daily 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 averagereport only (lb/d)all year001
Phosphorus, total [as P]daily maximumreport only (lb/d)all year001
Chloride [as Cl]weekly average≤ 560 mg/Lall year001
Chloride [as Cl]monthly averagereport only (lb/d)all year001
Chloride [as Cl]daily maximumreport only (lb/d)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
Mercury, total recoverablequarterly maximumreport only (ng/L)all year001
Coliform, fecal generalweekly geometric mean≤ 656 #/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 recoverabledaily maximumreport only (ng/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.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/WI0036021 · MCP: https://passage-data.com/mcp