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City of Mayville

Sewage treatment plant, major discharger, Mayville, Wisconsin. NPDES permit WI0024643 expired Sep 30, 2024; its limits still apply. Last 12 months: over a limit 5 times (last April 2026), 36 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (11 values), outfall 001 form Q quarterly (3 values), outfall 701 form A monthly (7 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
5 values over a limit, 24 required values missing, 0 of 31 reports late

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

Period endingParameterReportedLimitOver by
October 2025Phosphorus, total [as P], monthly average2.2514≤ 1.96 lb/d15%
December 2025Phosphorus, total [as P], monthly average2.0547≤ 1.96 lb/d5%
January 2026Phosphorus, total [as P], monthly average2.2846≤ 1.96 lb/d17%
February 2026Phosphorus, total [as P], monthly average2.1533≤ 1.96 lb/d10%
April 2026Phosphorus, total [as P], monthly average2.03≤ 1.96 lb/d4%

Limits in force (22)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimum≥ 6 mg/Lall year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedweekly average≤ 21 mg/Lall year001
Solids, total suspendedmonthly average≤ 21 mg/Lall year001
Nitrogen, total [as N]quarterly maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]weekly average≤ 4.4 mg/Lall year001
Nitrogen, ammonia total [as N]monthly average≤ 3.1 mg/Lall 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≤ 1.96 lb/dall year001
Chloride [as Cl]monthly averagereport only (lb/d)all year001
Chloride [as Cl]monthly maximumreport only (lb/d)all year001
Mercury, total recoverabledaily maximum≤ 4.5 ng/Lall year001
Mercury, total recoverablemonthly maximumreport only (ng/L)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
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 recoverablemonthly 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/WI0024643 · MCP: https://passage-data.com/mcp