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Port Washington City

Sewage treatment plant, major discharger, Port Washington, Wisconsin. NPDES permit WI0020460 expired Mar 31, 2026; its limits still apply. Last 12 months: no values over a limit, 34 required values missing, 19 of 42 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 21 days after each period: outfall 001 form A monthly (9 values), outfall 001 form Q quarterly (5 values), outfall 101 form A monthly (2 values), outfall 110 form Q quarterly (1 value), outfall 120 form Q quarterly (1 value), outfall 701 form A monthly (6 values), and 1 more form
Last report on file
June 2026
Oct 2024 – Sep 2025
3 values over a limit, 8 required values missing, 3 of 52 reports late

Limits in force (25)

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≤ 9 SUall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Nitrogen, total [as N]quarterly maximumreport only (mg/L)all year001
Nitrogen, Kjeldahl, total [as N]quarterly maximumreport only (mg/L)all year001
Nitrite + Nitrate total [as N]quarterly maximumreport only (mg/L)all year001
Phosphorus, total [as P]monthly average≤ .9 mg/Lall year001
Arsenic, total recoverablequarterly maximumreport only (ug/L)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all year001
Mercury, total recoverabledaily maximum≤ 3.8 ng/Lall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year101
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all year101
Mercury, total recoverablequarterly maximumreport only (ng/L)all year110
Arsenic, total recoverablequarterly maximumreport only (ug/L)all year120
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.

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/WI0020460 · MCP: https://passage-data.com/mcp