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Dakota Ethanol, LLC

Industrial Organic Chemicals, Wentworth, South Dakota. NPDES permit SD0027847 expired Dec 31, 2018; its limits still apply. Last 12 months: over a limit 2 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (21 values), form M quarterly (30 values), form W quarterly (4 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 0 of 20 reports late

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

Period endingParameterReportedLimitOver by
June 2026Oxygen, dissolved [DO], daily minimum2.3 mg/L≥ 5 mg/L54%
July 2026Oxygen, dissolved [DO], daily minimum3.9 mg/L≥ 5 mg/L22%

Limits in force (55)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheit30-day averagereport only (deg F)all year
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year
Flow rate30-day averagereport only (MGD)all year
Flow ratedaily maximumreport only (MGD)all year
Conductivity30-day average≤ 3800 umho/cmall year
Conductivitydaily maximum≤ 4375 umho/cmall year
Oxygen, dissolved [DO]daily minimum≥ 5 mg/Lall year
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Alkalinity, total [as CaCO3]30-day average≤ 750 mg/Lall year
Alkalinity, total [as CaCO3]daily maximum≤ 1313 mg/Lall year
Solids, total suspended30-day averagereport only (mg/L)all year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Oil and grease, hexane extr methoddaily maximum≤ 10 mg/Lall year
Nitrogen, ammonia total [as N]30-day averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, nitrate total [as N]30-day averagereport only (mg/L)all year
Nitrogen, nitrate total [as N]daily maximumreport only (mg/L)all year
Hardness, total [as CaCO3]30-day averagereport only (mg/L)all year
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year
Arsenic, total recoverable30-day averagereport only (ug/L)all year
Arsenic, total recoverabledaily maximumreport only (ug/L)all year
Selenium, total recoverable30-day average≤ 4.6 ug/Lall year
Selenium, total recoverabledaily maximum≤ 12.8 ug/Lall year
Nickel, total recoverable30-day averagereport only (ug/L)all year
Nickel, total recoverabledaily maximumreport only (ug/L)all year
Silver total recoverable30-day averagereport only (ug/L)all year
Silver total recoverabledaily maximumreport only (ug/L)all year
Zinc, total recoverable30-day averagereport only (ug/L)all year
Zinc, total recoverabledaily maximumreport only (ug/L)all year
Cadmium, total recoverable30-day averagereport only (ug/L)all year
Cadmium, total recoverabledaily maximumreport only (ug/L)all year
Lead, total recoverable30-day averagereport only (ug/L)all year
Lead, total recoverabledaily maximumreport only (ug/L)all year
Chromium, total recoverable30-day averagereport only (ug/L)all year
Chromium, total recoverabledaily maximumreport only (ug/L)all year
Copper, total recoverable30-day averagereport only (ug/L)all year
Copper, total recoverabledaily maximumreport only (ug/L)all year
Molybdenum, total recoverable30-day averagereport only (ug/L)all year
Molybdenum, total recoverabledaily maximumreport only (ug/L)all year
Floating solids, waste or visible foam-visualdaily maximum≤ 0 N=0;Y=1all year
Chlorine, total residualdaily maximum≤ .019 mg/Lall year
Toxicity [acute], Ceriodaphnia dubiadaily maximumreport only (toxic)all year
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximumreport only (toxic)all year
Solids, total dissolved30-day average≤ 3800 mg/Lall year
Solids, total dissolveddaily maximum≤ 4375 mg/Lall year
Mercury, total recoverable30-day averagereport only (ug/L)all year
Mercury, total recoverabledaily maximumreport only (ug/L)all year
Chemical Oxygen Demand [COD]30-day averagereport only (mg/L)all year
Chemical Oxygen Demand [COD]daily maximumreport only (mg/L)all year
Oil and grease visualdaily maximum≤ 0 N=0;Y=1all year
Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubiadaily maximum≤ 0 pass=0;fail=1all year
Pass/Fail Static Renewal 96Hr Acute Pimephales Promelasdaily maximum≤ 0 pass=0;fail=1all year

How strict are these limits?

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

Same industry: the 11 Chemicals and Allied Products permits in South Dakota.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/SD0027847 · MCP: https://passage-data.com/mcp