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Village of Rib Lake

Sewage treatment plant, Rib Lake, Wisconsin. NPDES permit WI0029017 expired Sep 30, 2023; its limits still apply. Last 12 months: over a limit 5 times (last June 2026), 41 required values missing, 14 of 22 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (13 values), outfall 701 form A monthly (4 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
22 values over a limit, 25 required values missing, 16 of 24 reports late

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

Period endingParameterReportedLimit
December 2025BOD, 5-day, 20 deg. C, daily maximum> 24.9≤ 30 mg/L
January 2026BOD, 5-day, 20 deg. C, daily maximum> 15.2≤ 30 mg/L
February 2026BOD, 5-day, 20 deg. C, daily maximum> 21.4≤ 30 mg/L
May 2026BOD, 5-day, 20 deg. C, daily maximum> 9≤ 30 mg/L
June 2026BOD, 5-day, 20 deg. C, daily maximum> 15.9≤ 30 mg/L

Limits in force (19)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year001
Oxygen, dissolved [DO]daily minimum≥ 4 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 15 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 30 mg/Lall year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 20 mg/Lall year001
Solids, total suspendeddaily maximum≤ 30 mg/Lall year001
Nitrogen, ammonia total [as N]weekly average≤ 12 mg/LMay–Oct001
Nitrogen, ammonia total [as N]weekly average≤ 17 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 6.6 mg/LMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 7.7 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Phosphorus, total [as P]monthly average≤ 1 mg/Lall 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
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/WI0029017 · MCP: https://passage-data.com/mcp