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Heron Lake BioEnergy

Industrial Organic Chemicals, Heron Lake, Minnesota. NPDES permit MN0067385, in force until Sep 30, 2027. Last 12 months: over a limit 4 times (last April 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: form A1 monthly (14 values)
Renewal application due
Apr 3, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
October 2025Solids, total suspended, daily maximum70≤ 54 mg/L30%
October 2025Solids, total suspended, monthly average62≤ 30 mg/L107%
November 2025Solids, total suspended, monthly average46≤ 30 mg/L53%
April 2026Solids, total suspended, monthly average36≤ 30 mg/L20%

Limits in force (14)

ParameterStatisticLimitMonths
Specific conductancemonthly maximumreport only (umho/cm)all year
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous maximum≤ 8.5 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendeddaily maximum≤ 54 mg/Lall year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Organics, gasoline rangemonthly maximumreport only (ug/L)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all year
Ethanolmonthly maximumreport only (ug/L)all year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 42 mg/Lall year
Duration of dischargemonthly totalreport only (d/mo)all year

How strict are these limits?

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

Same industry: the 15 Chemicals and Allied Products permits in Minnesota.

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/MN0067385 · MCP: https://passage-data.com/mcp