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Poet Biorefining - Mitchell

Industrial Organic Chemicals, Mitchell, South Dakota. NPDES permit SD0028240 expired Sep 30, 2019; its limits still apply. Last 12 months: no values over a limit, 1 of 17 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (39 values), form Q quarterly (14 values), form W quarterly (2 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 3 of 20 reports late

Limits in force (55)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheit30-day averagereport only (deg F)all year
Temperature, water deg. fahrenheitdaily maximum≤ 90 deg Fall year
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year
Temp. diff. between samp. & upstrm deg. Fdaily maximum≤ 5 deg Fall year
Flow rate30-day averagereport only (MGD)all year
Flow ratedaily maximumreport only (MGD)all year
Conductivity30-day average≤ 2500 umho/cmall year
Conductivitydaily maximum≤ 4375 umho/cmall year
Oxygen, dissolved [DO]daily minimum≥ 5 mg/Lall year
Oxygen, dissolved [DO]daily minimumreport only (mg/L)all year
BOD, 5-day, 20 deg. C30-day average≤ 18 mg/Lall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 32 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≥ 7 SUall year
pHdaily maximum≤ 8.1 SUall year
Alkalinity, total [as CaCO3]30-day averagereport only (mg/L)all year
Alkalinity, total [as CaCO3]daily maximumreport only (mg/L)all year
Solids, total suspended30-day average≤ 77 mg/Lall year
Solids, total suspendeddaily maximum≤ 134 mg/Lall year
Oil and grease, hexane extr methoddaily maximum≤ 10 mg/Lall year
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/Lall year
Nitrogen, ammonia total [as N]daily maximum≤ 2.3 mg/Lall 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 averagereport only (ug/L)all year
Selenium, total recoverabledaily maximumreport only (ug/L)all year
Nickel, total recoverable30-day averagereport only (ug/L)all year
Nickel, 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 average≤ .76 ug/Lall year
Cadmium, total recoverabledaily maximum≤ 8.73 ug/Lall 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
Floating solids, waste or visible foam-visualdaily maximumreport only (N=0;Y=1)all year
Chlorine, total residualdaily maximum≤ .019 mg/Lall year
E. coli, colony forming units [CFU]30-day geometric mean≤ 630 #/100mLMay–Sep
E. coli, colony forming units [CFU]EPA's "DPD MAX"≤ 1178 #/100mLMay–Sep
Flow, totalmonthly totalreport only (Mgal)all year
Toxicity [acute], Ceriodaphnia dubiadaily maximum≤ .3 tox acuteall year
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximum≤ .3 tox acuteall year
Solids, total dissolved30-day average≤ 2500 mg/Lall year
Solids, total dissolveddaily maximum≤ 4375 mg/Lall year
Duration of dischargemonthly totalreport only (d)all year
Oil and grease visualdaily maximum< 1 N=0;Y=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/SD0028240 · MCP: https://passage-data.com/mcp