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Denmark Wastewater Treatment F

Sewage treatment plant, Denmark, Wisconsin. NPDES permit WI0021741 expired Sep 30, 2023; its limits still apply. Last 12 months: over a limit 13 times (last May 2026), 53 required values missing, 16 of 22 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (16 values), outfall 701 form A monthly (6 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
26 values over a limit, 0 required values missing, 22 of 24 reports late

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

All 13 values over a limit
Period endingParameterReportedLimitOver by
October 2025pH, daily minimum5.32≥ 6 SU—
November 2025pH, daily minimum3.93≥ 6 SU—
December 2025Chloride [as Cl], daily maximum1402≤ 1200 mg/L17%
December 2025Chloride [as Cl], weekly average1013.8≤ 980 mg/L3%
December 2025pH, daily minimum4.06≥ 6 SU—
January 2026Chloride [as Cl], daily maximum1207≤ 1200 mg/L1%
January 2026pH, daily minimum4.41≥ 6 SU—
February 2026Chloride [as Cl], daily maximum1263≤ 1200 mg/L5%
February 2026Chloride [as Cl], weekly average1031.5≤ 980 mg/L5%
February 2026Solids, total suspended, daily maximum41≤ 30 mg/L37%
March 2026Nitrogen, ammonia total [as N], daily maximum7.1≤ 3.9 mg/L82%
April 2026Nitrogen, ammonia total [as N], daily maximum4.2≤ 3.9 mg/L8%
May 2026pH, daily minimum4.53≥ 6 SU—

Limits in force (25)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year001
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≤ 4.8 mg/LApr–Sep001
Nitrogen, ammonia total [as N]monthly average≤ 4.9 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 2.9 mg/LApr–Sep001
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LApr–Sep001
Phosphorus, total [as P]monthly average≤ 1 mg/Lall year001
Chloride [as Cl]weekly average≤ 980 mg/Lall year001
Chloride [as Cl]daily maximum≤ 1200 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
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year701
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)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/WI0021741 · MCP: https://passage-data.com/mcp