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Oakfield Wastewater Treatment

Sewage treatment plant, Oakfield, Wisconsin. NPDES permit WI0024988 expired Sep 30, 2022; its limits still apply. Last 12 months: over a limit 2 times (last April 2026), 50 required values missing, 18 of 22 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (20 values), outfall 701 form A monthly (4 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
1 value over a limit, 5 required values missing, 20 of 24 reports late

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

Period endingParameterReportedLimitOver by
October 2025Phosphorus, total [as P], monthly average4.1489≤ 3.63 mg/L14%
April 2026BOD, 5-day, 20 deg. C, weekly average95.7≤ 88 lb/d9%

Limits in force (41)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimumreport only (mg/L)all year001
BOD, 5-day, 20 deg. Cweekly average≤ 19 mg/LMay–Oct001
BOD, 5-day, 20 deg. Cweekly average≤ 35 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmonthly average≤ 19 mg/LMay–Oct001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)May–Oct001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmonthly averagereport only (lb/d)May–Oct001
BOD, 5-day, 20 deg. Cmonthly averagereport only (lb/d)Jan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cweekly average≤ 48 lb/dMay–Oct001
BOD, 5-day, 20 deg. Cweekly average≤ 88 lb/dJan, Feb, Mar, Apr, Nov, Dec001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Nitrogen, ammonia total [as N]weekly average≤ 12 mg/LOct001
Nitrogen, ammonia total [as N]weekly average≤ 20 mg/LNov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 12 mg/LJan–Mar001
Nitrogen, ammonia total [as N]weekly average≤ 8.6 mg/LApr, May001
Nitrogen, ammonia total [as N]weekly average≤ 12 mg/LJun–Sep001
Nitrogen, ammonia total [as N]monthly average≤ 9.4 mg/LOct001
Nitrogen, ammonia total [as N]monthly average≤ 9.4 mg/LNov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 5.7 mg/LJan–Mar001
Nitrogen, ammonia total [as N]monthly average≤ 4 mg/LApr, May001
Nitrogen, ammonia total [as N]monthly average≤ 6.2 mg/LJun–Sep001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 24 mg/LNov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 24 mg/LJan–Mar001
Nitrogen, ammonia total [as N]daily maximum≤ 24 mg/LApr, May001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jun–Sep001
Phosphorus, total [as P]monthly average≤ 3.63 mg/Lall year001
Chloride [as Cl]daily maximumreport only (mg/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
Chlorine, total residualweekly average≤ 14 ug/LMay–Sep001
Chlorine, total residualmonthly average≤ 14 ug/LMay–Sep001
Chlorine, total residualdaily maximum≤ 38 ug/LMay–Sep001
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

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/WI0024988 · MCP: https://passage-data.com/mcp