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Didion Milling Inc Ethanol Plant

Industrial Organic Chemicals, Cambria, Wisconsin. NPDES permit WI0066401 expired Dec 31, 2023; its limits still apply. Last 12 months: over a limit once (last December 2025), 42 required values missing, 6 of 22 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (7 values), outfall 002 form A monthly (7 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
0 values over a limit, 14 required values missing, 10 of 24 reports late

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

Period endingParameterReportedLimitOver by
December 2025Solids, total suspended, daily maximum42≤ 40 mg/L5%

Limits in force (24)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitdaily maximum≤ 86 deg Fall year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 40 mg/Lall year001
Solids, total suspendeddaily maximum≤ 40 mg/Lall year001
Hardness, total [as CaCO3]daily maximumreport only (mg/L)Jun, Dec001
Arsenic, total recoverabledaily maximumreport only (ug/L)Jun, Dec001
Zinc, total recoverabledaily maximumreport only (ug/L)Dec001
Lead, total recoverabledaily maximumreport only (ug/L)Dec001
Copper, total recoverabledaily maximumreport only (ug/L)Dec001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Temperature, water deg. fahrenheitdaily maximum≤ 86 deg Fall year002
pHdaily minimum≥ 6 SUall year002
pHdaily maximum≤ 9 SUall year002
Solids, total suspendedmonthly average≤ 40 mg/Lall year002
Solids, total suspendeddaily maximum≤ 40 mg/Lall year002
Hardness, total [as CaCO3]daily maximumreport only (mg/L)Jun, Dec002
Arsenic, total recoverabledaily maximumreport only (ug/L)Jun, Dec002
Zinc, total recoverabledaily maximumreport only (ug/L)Dec002
Lead, total recoverabledaily maximumreport only (ug/L)Dec002
Copper, total recoverabledaily maximumreport only (ug/L)Dec002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002

How strict are these limits?

Cited limits by parameter: Wisconsin's rules and the federal ones.

Same industry: the 5 Chemicals and Allied Products permits in Wisconsin.

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/WI0066401 · MCP: https://passage-data.com/mcp