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Columbus Wastewater Treatment

Sewage treatment plant, major discharger, Columbus, Wisconsin. NPDES permit WI0021008 expired Jun 30, 2025; its limits still apply. Last 12 months: over a limit once (last April 2026), 18 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 010 form A monthly (10 values), outfall 010 form Q quarterly (3 values), outfall 103 form Q quarterly (1 value), outfall 106 form A monthly (2 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
1 value over a limit, 0 required values missing, 0 of 48 reports late

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

Period endingParameterReportedLimitOver by
April 2026Solids, total suspended, weekly average106.0362≤ 83.4 lb/d27%

Limits in force (23)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimum≥ 6 mg/Lall year010
BOD, 5-day, 20 deg. Cweekly average≤ 12 mg/Lall year010
BOD, 5-day, 20 deg. Cmonthly average≤ 12 mg/Lall year010
BOD, 5-day, 20 deg. Cweekly average≤ 130 lb/dall year010
pHdaily minimum≥ 6 SUall year010
pHdaily maximum≤ 9 SUall year010
Solids, total suspendedweekly average≤ 83.4 lb/dall year010
Nitrogen, total [as N]quarterly maximumreport only (mg/L)all year010
Nitrogen, Kjeldahl, total [as N]quarterly maximumreport only (mg/L)all year010
Nitrite + Nitrate total [as N]quarterly maximumreport only (mg/L)all year010
Phosphorus, total [as P]monthly average≤ 10.57 lb/dall year010
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year010
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all year010
Mercury, total recoverablequarterly maximumreport only (ng/L)all year103
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year106
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all year106
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/WI0021008 · MCP: https://passage-data.com/mcp