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Village of Ridgeland

Sewage treatment plant, Ridgeland, Wisconsin. NPDES permit WI0021296 expired Sep 30, 2023; its limits still apply. Last 12 months: over a limit 2 times (last May 2026), 26 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 (7 values), outfall 701 form A monthly (6 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 24 of 24 reports late

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

Period endingParameterReportedLimitOver by
May 2026BOD, 5-day, 20 deg. C, monthly average30.775≤ 30 mg/L3%
May 2026BOD, 5-day, 20 deg. C, weekly average45.35≤ 45 mg/L1%

Limits in force (16)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 10 SUall year001
Solids, total suspendedmonthly average≤ 60 mg/Lall year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]total≤ 97 lb/yrDec001
Flow, in conduit or thru treatment plantdaily maximum≤ .38 MGDOct, Nov001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)Jan, Feb, Mar, Jun, Jul, Aug, Sep, Dec001
Flow, in conduit or thru treatment plantdaily maximum≤ .59 MGDApr, May001
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
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year701
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year701

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/WI0021296 · MCP: https://passage-data.com/mcp