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Green Plains Inc.

Industrial Organic Chemicals, Superior, Iowa. NPDES permit IA0081281, in force until Apr 30, 2029. Last 12 months: over a limit 2 times (last October 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (13 values)
Last report on file
September 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 2025Iron, total [as Fe], daily maximum1.81≤ 1.015 mg/L78%
October 2025Iron, total [as Fe], daily maximum6.813369≤ 4.84 lb/d41%

Limits in force (13)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 5 mg/Lall year
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspendeddaily maximum≤ 45 mg/Lall year
Sulfate, total [as SO4]30-day average≤ 1360 mg/Lall year
Sulfate, total [as SO4]daily maximum≤ 1360 mg/Lall year
Sulfate, total [as SO4]30-day average≤ 6223 lb/dall year
Sulfate, total [as SO4]daily maximum≤ 6223 lb/dall year
Iron, total [as Fe]30-day average≤ 1.015 mg/Lall year
Iron, total [as Fe]daily maximum≤ 1.015 mg/Lall year
Iron, total [as Fe]30-day average≤ 4.84 lb/dall year
Iron, total [as Fe]daily maximum≤ 4.84 lb/dall year

How strict are these limits?

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

Same industry: the 57 Chemicals and Allied Products permits in Iowa.

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/IA0081281 · MCP: https://passage-data.com/mcp