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POET Biorefining - Lake Crystal LLC

Industrial Organic Chemicals, Lake Crystal, Minnesota. NPDES permit MN0067172, in force until Nov 30, 2028. Last 12 months: over a limit 6 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D002 form A1 monthly (14 values), outfall D003 form A1 monthly (14 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
5 values over a limit, 0 required values missing, 0 of 24 reports late

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

Period endingOutfallParameterReportedLimitOver by
April 2026D002Solids, total suspended, monthly average42≤ 30 mg/L40%
July 2026D003Solids, total suspended, daily maximum46≤ 41 mg/L12%
July 2026D003Solids, total suspended, monthly average46≤ 30 mg/L53%
August 2026D002Solids, total suspended, monthly average34≤ 30 mg/L13%
August 2026D003Solids, total suspended, daily maximum56≤ 41 mg/L37%
August 2026D003Solids, total suspended, monthly average56≤ 30 mg/L87%

Limits in force (28)

ParameterStatisticLimitMonthsOutfall
Specific conductancemonthly maximumreport only (umho/cm)all yearD002
pHinstantaneous minimum≥ 6 SUall yearD002
pHinstantaneous maximum≤ 9 SUall yearD002
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD002
Solids, total suspendeddaily maximum≤ 44 mg/Lall yearD002
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearD002
Organics, gasoline rangemonthly maximumreport only (ug/L)all yearD002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD002
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD002
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD002
Ethanolmonthly maximumreport only (ug/L)all yearD002
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall yearD002
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 37 mg/Lall yearD002
Duration of dischargemonthly totalreport only (d/mo)all yearD002
Specific conductancemonthly maximumreport only (umho/cm)all yearD003
pHinstantaneous minimum≥ 6 SUall yearD003
pHinstantaneous maximum≤ 9 SUall yearD003
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD003
Solids, total suspendeddaily maximum≤ 41 mg/Lall yearD003
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearD003
Organics, gasoline rangemonthly maximumreport only (ug/L)all yearD003
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD003
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD003
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD003
Ethanolmonthly maximumreport only (ug/L)all yearD003
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall yearD003
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 37 mg/Lall yearD003
Duration of dischargemonthly totalreport only (d/mo)all yearD003

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.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MN0067172 · MCP: https://passage-data.com/mcp