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Poet Biorefining - Groton

Industrial Organic Chemicals, Groton, South Dakota. NPDES permit SD0027910 expired Sep 30, 2019; its limits still apply. Last 12 months: no values over a limit, 3 of 20 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (34 values), form M quarterly (22 values), form W quarterly (2 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 12 of 20 reports late

Limits in force (60)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheit30-day averagereport only (deg F)all year
Temperature, water deg. fahrenheitdaily maximum≤ 86 deg Fall year
Temperature, water deg. fahrenheitdaily maximumreport 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≤ 2500 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 average≤ 10 mg/Lall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 17.5 mg/Lall year
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 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 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 average≤ 1 mg/LMar–Oct
Nitrogen, ammonia total [as N]30-day average≤ 3.7 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 5.9 mg/LMar–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 7.2 mg/LJan, Feb, Nov, Dec
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
Silver total recoverable30-day averagereport only (ug/L)all year
Silver total recoverabledaily maximumreport only (ug/L)all year
Zinc, total recoverable30-day average≤ 388 ug/Lall year
Zinc, total recoverabledaily maximum≤ 388 ug/Lall 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 average≤ 30.5 ug/Lall year
Copper, total recoverabledaily maximum≤ 50 ug/Lall year
Molybdenum, total recoverable30-day averagereport only (ug/L)all year
Molybdenum, total recoverabledaily maximumreport only (ug/L)all year
Temp. diff. between up/down stream deg. Fdaily maximum≤ 5 deg Fall year
Floating solids, waste or visible foam-visualdaily maximum≤ 0 N=0;Y=1all year
Flow, in conduit or thru treatment plant30-day averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualdaily maximum≤ .019 mg/Lall year
Flow, totalmonthly totalreport only (Mgal)all year
Toxicity [acute], Ceriodaphnia dubiadaily maximum≤ 1 tox acuteall year
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximum≤ 1 tox acuteall year
Solids, total dissolved30-day average≤ 2500 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
Duration of dischargemonthly totalreport only (d)all year
Oil and grease visualdaily maximum≤ 0 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/SD0027910 · MCP: https://passage-data.com/mcp