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City of Watertown

Sewage treatment plant, major discharger, Watertown, Wisconsin. NPDES permit WI0028541 expired Sep 30, 2025; its limits still apply. Last 12 months: no values over a limit, 27 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (8 values), outfall 001 form Q quarterly (9 values), outfall 102 form Q quarterly (1 value), outfall 103 form A monthly (2 values), outfall 701 form A monthly (6 values), outfall 701 form Q quarterly (7 values), and 1 more form
Last report on file
June 2026
Oct 2024 – Sep 2025
0 values over a limit, 2 required values missing, 0 of 49 reports late

Limits in force (35)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitmonthly maximumreport only (deg F)all year001
Oxygen, dissolved [DO]daily minimum≥ 6 mg/Lall year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedweekly average≤ 10 mg/Lall year001
Solids, total suspendedmonthly average≤ 10 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]annual averagereport only (lb/yr)all year001
Phosphorus, total [as P]annual maximumreport only (lb/yr)all year001
Nickel, total recoverablequarterly maximumreport only (ug/L)all year001
Cadmium, total recoverablequarterly maximumreport only (ug/L)all year001
Lead, total recoverablequarterly maximumreport only (ug/L)all year001
Chromium, total recoverablequarterly maximumreport only (ug/L)all year001
Copper, 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≤ 3.7 ng/Lall year001
Mercury, total recoverablequarterly maximumreport only (ng/L)all year102
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year103
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all year103
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
Nickel, total recoverablequarterly maximumreport only (ug/L)all year701
Zinc, total recoverablequarterly maximumreport only (ug/L)all year701
Cadmium, total recoverablequarterly maximumreport only (ug/L)all year701
Lead, total recoverablequarterly maximumreport only (ug/L)all year701
Chromium, total recoverablequarterly maximumreport only (ug/L)all year701
Copper, total recoverablequarterly maximumreport only (ug/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/WI0028541 · MCP: https://passage-data.com/mcp