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Ashippun Sanitary District

Sewage treatment plant, Ashippun, Wisconsin. NPDES permit WI0031381 expired Jun 30, 2023; its limits still apply. Last 12 months: no values over a limit, 50 required values missing, 14 of 22 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 004 form A monthly (12 values), outfall 701 form A monthly (2 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
2 values over a limit, 12 required values missing, 22 of 24 reports late

Limits in force (22)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year004
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year004
pHdaily minimum≥ 6 SUall year004
pHdaily maximum≤ 9 SUall year004
Solids, total suspendedweekly average≤ 45 mg/LJan, Mar, May, Jul, Aug, Oct, Dec004
Solids, total suspendedweekly average≤ 45 mg/LApr, Jun, Sep, Nov004
Solids, total suspendedweekly average≤ 45 mg/LFeb004
Solids, total suspendedmonthly average≤ 30 mg/LJan, Mar, May, Jul, Aug, Oct, Dec004
Solids, total suspendedmonthly average≤ 30 mg/LApr, Jun, Sep, Nov004
Solids, total suspendedmonthly average≤ 30 mg/LFeb004
Solids, total suspendedmonthly average≤ 34.8 lb/dJan, Mar, May, Jul, Aug, Oct, Dec004
Solids, total suspendedmonthly average≤ 36 lb/dApr, Jun, Sep, Nov004
Solids, total suspendedmonthly average≤ 38.6 lb/dFeb004
Solids, total suspendedweekly average≤ 57.1 lb/dJan, Mar, May, Jul, Aug, Oct, Dec004
Solids, total suspendedweekly average≤ 59 lb/dApr, Jun, Sep, Nov004
Solids, total suspendedweekly average≤ 63.3 lb/dFeb004
Phosphorus, total [as P]monthly average≤ 3.8 mg/Lall year004
Phosphorus, total [as P]monthly averagereport only (lb/d)all year004
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year004
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year004
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year701
BOD, 5-day, 20 deg. Cdaily 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/WI0031381 · MCP: https://passage-data.com/mcp