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Village of Oregon

Sewage treatment plant, major discharger, Oregon, Wisconsin. NPDES permit WI0020681 expired Mar 31, 2025; its limits still apply. Last 12 months: over a limit 4 times (last May 2026), 19 required values missing, 2 of 29 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 21 days after each period: outfall 001 form A monthly (7 values), outfall 001 form Q quarterly (4 values), outfall 107 form Q quarterly (1 value), 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, 0 required values missing, 0 of 36 reports late

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

Period endingParameterReportedLimitOver by
April 2026BOD, 5-day, 20 deg. C, monthly average29.4545≤ 20 mg/L47%
April 2026BOD, 5-day, 20 deg. C, weekly average34.3333≤ 30 mg/L14%
May 2026BOD, 5-day, 20 deg. C, monthly average26.8≤ 20 mg/L34%
May 2026BOD, 5-day, 20 deg. C, weekly average35.3333≤ 30 mg/L18%

Limits in force (19)

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
Solids, total suspendedweekly average≤ 30 mg/Lall year001
Solids, total suspendedmonthly average≤ 20 mg/Lall year001
Nitrogen, total [as N]quarterly maximumreport only (mg/L)all year001
Nitrogen, Kjeldahl, total [as N]quarterly maximumreport only (mg/L)all year001
Nitrite + Nitrate total [as N]quarterly maximumreport only (mg/L)all year001
Mercury, total recoverablequarterly maximumreport only (ng/L)all year001
Mercury, total recoverablequarterly maximumreport only (ng/L)all year107
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
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/WI0020681 · MCP: https://passage-data.com/mcp