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Rosendale Wastewater Treatment

Sewage treatment plant, Rosendale, Wisconsin. NPDES permit WI0028428 expired Sep 30, 2022; its limits still apply. Last 12 months: over a limit 5 times (last February 2026), 36 required values missing, 4 of 22 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (14 values), outfall 701 form A monthly (4 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
6 values over a limit, 0 required values missing, 12 of 24 reports late

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

Period endingParameterReportedLimitOver by
October 2025Chloride [as Cl], weekly average625≤ 613 mg/L2%
November 2025Chloride [as Cl], weekly average637≤ 613 mg/L4%
December 2025Chloride [as Cl], weekly average711≤ 613 mg/L16%
January 2026Chloride [as Cl], weekly average652≤ 613 mg/L6%
February 2026Chloride [as Cl], weekly average636≤ 613 mg/L4%

Limits in force (25)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)Oct–Dec001
Oxygen, dissolved [DO]daily minimum≥ 4 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 15 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 30 mg/Lall year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 20 mg/Lall year001
Solids, total suspendeddaily maximum≤ 30 mg/Lall year001
Nitrogen, ammonia total [as N]weekly average≤ 11 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 4.7 mg/LApr, May001
Nitrogen, ammonia total [as N]weekly average≤ 3.5 mg/LJun–Sep001
Nitrogen, ammonia total [as N]monthly average≤ 4.9 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 2.1 mg/LApr, May001
Nitrogen, ammonia total [as N]monthly average≤ 1.9 mg/LJun–Sep001
Nitrogen, ammonia total [as N]daily maximum≤ 14 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 14 mg/LApr, May001
Nitrogen, ammonia total [as N]daily maximum≤ 14 mg/LJun–Sep001
Phosphorus, total [as P]monthly average≤ 4.7 mg/Lall year001
Chloride [as Cl]weekly average≤ 613 mg/Lall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
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

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/WI0028428 · MCP: https://passage-data.com/mcp