Passage Data · Check a report · Use it from your AI

City of Mellen

Sewage treatment plant, Mellen, Wisconsin. NPDES permit WI0020311 expired Mar 31, 2025; its limits still apply. Last 12 months: over a limit 4 times (last November 2025), 15 required values missing, 2 of 26 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 21 days after each period: outfall 002 form A monthly (8 values), outfall 002 form Q quarterly (1 value), outfall 701 form A monthly (7 values), outfall 701 form Q quarterly (1 value)
Last report on file
June 2026
Oct 2024 – Sep 2025
2 values over a limit, 1 required value missing, 2 of 32 reports late

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

Period endingParameterReportedLimitOver by
October 2025BOD, carbonaceous [5 day, 5 C], monthly average40≤ 25 mg/L60%
October 2025BOD, carbonaceous [5 day, 5 C], weekly average75≤ 40 mg/L88%
November 2025BOD, carbonaceous [5 day, 5 C], monthly average45≤ 25 mg/L80%
November 2025BOD, carbonaceous [5 day, 5 C], weekly average< 110≤ 40 mg/L175%

Limits in force (17)

ParameterStatisticLimitMonthsOutfall
pHdaily minimum≥ 6 SUall year002
pHdaily maximum≤ 9 SUall year002
Solids, total suspendedweekly average≤ 45 mg/Lall year002
Solids, total suspendedmonthly average≤ 30 mg/Lall year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all year002
Mercury, total recoverabledaily maximum≤ 6.5 ng/Lall year002
BOD, carbonaceous [5 day, 5 C]weekly average≤ 40 mg/Lall year002
BOD, carbonaceous [5 day, 5 C]monthly average≤ 25 mg/Lall year002
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
BOD, carbonaceous [5 day, 5 C]monthly 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

· Save this facility as a site · Superfund sites nearby · Your permits on one board

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/WI0020311 · MCP: https://passage-data.com/mcp