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Shell Rock Soy Processing LLC

Soybean Oil Mills, Shell Rock, Iowa. NPDES permit IA0053366, in force until Apr 30, 2027. Last 12 months: over a limit 10 times (last August 2026), 10 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (10 values)
Renewal application due
Nov 1, 2026 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
27 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 2025Nitrogen, nitrate total [as N], 30-day average9.6≤ 9.5 mg/L1%
October 2025Nitrogen, nitrate total [as N], daily maximum9.6≤ 9.5 mg/L1%
February 2026Nitrogen, nitrate total [as N], 30-day average9.67≤ 9.5 mg/L2%
February 2026Nitrogen, nitrate total [as N], daily maximum9.67≤ 9.5 mg/L2%
February 2026pH, daily maximum9.6≤ 9 SU—
June 2026Nitrogen, nitrate total [as N], 30-day average10.7≤ 9.5 mg/L13%
June 2026Nitrogen, nitrate total [as N], daily maximum10.7≤ 9.5 mg/L13%
August 2026Chlorine, total residual, daily maximum.034238≤ .0228 lb/d50%
August 2026Nitrogen, nitrate total [as N], 30-day average9.58≤ 9.5 mg/L1%
August 2026Nitrogen, nitrate total [as N], daily maximum9.58≤ 9.5 mg/L1%

Limits in force (28)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheit30-day average≤ 98.5 deg FFeb
Temperature, water deg. fahrenheit30-day average≤ 110.9 deg FMar
Temperature, water deg. fahrenheit30-day average≤ 81.8 deg FJan
Temperature, water deg. fahrenheit30-day average≤ 114.3 deg FApr
Temperature, water deg. fahrenheit30-day average≤ 133.3 deg FOct
Temperature, water deg. fahrenheit30-day average≤ 133.5 deg FJul
Temperature, water deg. fahrenheit30-day average≤ 118.7 deg FMay
Temperature, water deg. fahrenheit30-day average≤ 128.5 deg FJun
Temperature, water deg. fahrenheit30-day average≤ 98.8 deg FNov
Temperature, water deg. fahrenheit30-day average≤ 83 deg FDec
Temperature, water deg. fahrenheit30-day average≤ 138.7 deg FSep
Temperature, water deg. fahrenheit30-day average≤ 130.2 deg FAug
Temperature, water deg. fahrenheitdaily maximum≤ 185.9 deg FApr
Temperature, water deg. fahrenheitdaily maximum≤ 164.6 deg FOct
Temperature, water deg. fahrenheitdaily maximum≤ 133.5 deg FJul
Temperature, water deg. fahrenheitdaily maximum≤ 167 deg FMay
Temperature, water deg. fahrenheitdaily maximum≤ 149 deg FJun
Temperature, water deg. fahrenheitdaily maximum≤ 196.5 deg FNov
Temperature, water deg. fahrenheitdaily maximum≤ 145 deg FSep
Temperature, water deg. fahrenheitdaily maximum≤ 130.2 deg FAug
pHdaily minimum≥ 6.4 SUall year
pHdaily maximum≤ 9 SUall year
Nitrogen, nitrate total [as N]30-day average≤ 9.5 mg/Lall year
Nitrogen, nitrate total [as N]daily maximum≤ 9.5 mg/Lall year
Chlorine, total residual30-day average≤ .025 mg/Lall year
Chlorine, total residualdaily maximum≤ .034 mg/Lall year
Chlorine, total residual30-day average≤ .017 lb/dall year
Chlorine, total residualdaily maximum≤ .0228 lb/dall year

How strict are these limits?

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

Same industry: the 48 Food and Kindred Products permits in Iowa.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IA0053366 · MCP: https://passage-data.com/mcp