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Village of Deerfield

Sewage treatment plant, Deerfield, Wisconsin. NPDES permit WI0023744 expired Dec 31, 2025; its limits still apply. Last 12 months: over a limit 8 times (last May 2026), 23 required values missing, 10 of 20 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 21 days after each period: outfall 001 form A monthly (17 values), outfall 701 form A monthly (6 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
3 values over a limit, 2 required values missing, 10 of 24 reports late

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

Period endingParameterReportedLimitOver by
March 2026BOD, 5-day, 20 deg. C, monthly average36.3333≤ 20 mg/L82%
March 2026BOD, 5-day, 20 deg. C, weekly average40.3333≤ 30 mg/L34%
March 2026Phosphorus, total [as P], monthly average1.1608≤ 1 mg/L16%
April 2026BOD, 5-day, 20 deg. C, monthly average29≤ 20 mg/L45%
April 2026BOD, 5-day, 20 deg. C, weekly average39≤ 30 mg/L30%
April 2026Phosphorus, total [as P], monthly average1.2142≤ 1 mg/L21%
May 2026BOD, 5-day, 20 deg. C, monthly average39.6583≤ 20 mg/L98%
May 2026BOD, 5-day, 20 deg. C, weekly average54.6667≤ 30 mg/L82%

Limits in force (23)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimum≥ 4 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 20 mg/Lall year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall 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]monthly maximumreport only (lb/d)all year001
Chloride [as Cl]weekly average≤ 460 mg/Lall year001
Chloride [as Cl]monthly averagereport only (lb/d)all year001
Chloride [as Cl]monthly maximumreport only (lb/d)all year001
Copper, total recoverablemonthly average≤ 33 ug/Lall year001
Copper, total recoverabledaily maximum≤ 47 ug/Lall year001
Copper, total recoverableweekly average≤ .11 lb/dall year001
Copper, total recoverabledaily maximum≤ .15 lb/dall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year701
BOD, 5-day, 20 deg. Cmonthly maximumreport only (mg/L)all year701
Solids, total suspendedmonthly averagereport only (mg/L)all year701
Solids, total suspendedmonthly maximumreport only (mg/L)all year701
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year701
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all year701

How strict are these limits?

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/WI0023744 · MCP: https://passage-data.com/mcp