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Grain Processing Corporation

Wet Corn Milling, major discharger, Muscatine, Iowa. NPDES permit IA0003441, in force until Oct 31, 2027. Last 12 months: over a limit once (last April 2026), 6 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (8 values), outfall 002 form A monthly (6 values), outfall 003 form A monthly (6 values), outfall 004 form A monthly (6 values), outfall 005 form A monthly (6 values), outfall 006 form A monthly (34 values), and 1 more form
Renewal application due
May 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 0 of 84 reports late

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

Period endingParameterReportedLimit
April 2026pH, daily maximum9.27≤ 9 SU

Limits in force (103)

ParameterStatisticLimitMonthsOutfall
pHdaily minimum≥ 6.1 SUall year001
pHdaily maximum≤ 9 SUall year001
Chlorine, total residual30-day average≤ .9691 mg/Lall year001
Chlorine, total residualdaily maximum≤ .9691 mg/Lall year001
Chlorine, total residual30-day average≤ 66.52 lb/dall year001
Chlorine, total residualdaily maximum≤ 66.52 lb/dall year001
Toxicity [acute], Ceriodaphnia dubiadaily maximum≤ 1 N=0;Y=1all year001
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximum≤ 1 N=0;Y=1all year001
pHdaily minimum≥ 6.1 SUall year002
pHdaily maximum≤ 9 SUall year002
Chlorine, total residual30-day average≤ .9691 mg/Lall year002
Chlorine, total residualdaily maximum≤ .9691 mg/Lall year002
Chlorine, total residual30-day average≤ 124.62 lb/dall year002
Chlorine, total residualdaily maximum≤ 124.62 lb/dall year002
pHdaily minimum≥ 6.1 SUall year003
pHdaily maximum≤ 9 SUall year003
Chlorine, total residual30-day average≤ .9691 mg/Lall year003
Chlorine, total residualdaily maximum≤ .9691 mg/Lall year003
Chlorine, total residual30-day average≤ 99.2 lb/dall year003
Chlorine, total residualdaily maximum≤ 99.2 lb/dall year003
pHdaily minimum≥ 6.1 SUall year004
pHdaily maximum≤ 9 SUall year004
Chlorine, total residual30-day average≤ .9691 mg/Lall year004
Chlorine, total residualdaily maximum≤ .9691 mg/Lall year004
Chlorine, total residual30-day average≤ 78.41 lb/dall year004
Chlorine, total residualdaily maximum≤ 78.41 lb/dall year004
pHdaily minimum≥ 6.1 SUall year005
pHdaily maximum≤ 9 SUall year005
Chlorine, total residual30-day average≤ .9691 mg/Lall year005
Chlorine, total residualdaily maximum≤ .9691 mg/Lall year005
Chlorine, total residual30-day average≤ 111.32 lb/dall year005
Chlorine, total residualdaily maximum≤ 111.32 lb/dall year005
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all year006
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year006
BOD, 5-day, 20 deg. C30-day averagereport only (lb/d)all year006
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)all year006
pHdaily minimum≥ 6.1 SUall year006
pHdaily maximum≤ 9 SUall year006
pH30-day averagereport only (SU)all year006
pHdaily maximumreport only (SU)all year006
Solids, total suspended30-day averagereport only (mg/L)all year006
Solids, total suspendeddaily maximumreport only (mg/L)all year006
Solids, total suspended30-day averagereport only (lb/d)all year006
Solids, total suspendeddaily maximumreport only (lb/d)all year006
Nitrogen, total [as N]30-day averagereport only (mg/L)all year006
Nitrogen, total [as N]daily maximumreport only (mg/L)all year006
Nitrogen, total [as N]30-day averagereport only (lb/d)all year006
Nitrogen, total [as N]daily maximumreport only (lb/d)all year006
Nitrogen, Kjeldahl, total [as N]30-day averagereport only (mg/L)all year006
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year006
Nitrogen, Kjeldahl, total [as N]30-day averagereport only (lb/d)all year006
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (lb/d)all year006
Phosphorus, total [as P]30-day averagereport only (mg/L)all year006
Phosphorus, total [as P]daily maximumreport only (mg/L)all year006
Phosphorus, total [as P]30-day averagereport only (lb/d)all year006
Phosphorus, total [as P]daily maximumreport only (lb/d)all year006
Chloride [as Cl]30-day average≤ 768 mg/Lall year006
Chloride [as Cl]daily maximum≤ 768 mg/Lall year006
Chloride [as Cl]30-day average≤ 65655 lb/dall year006
Chloride [as Cl]daily maximum≤ 65655 lb/dall year006
Chlorine, total residual30-day average≤ .9691 mg/Lall year006
Chlorine, total residualdaily maximum≤ .9691 mg/Lall year006
Chlorine, total residual30-day average≤ 83.84 lb/dall year006
Chlorine, total residualdaily maximum≤ 83.84 lb/dall year006
Toxicity [acute], Ceriodaphnia dubiadaily maximum≤ 1 N=0;Y=1all year006
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximum≤ 1 N=0;Y=1all year006
Temperature, water deg. fahrenheit30-day average≤ 103 deg FFebSUM
Temperature, water deg. fahrenheit30-day average≤ 119.2 deg FMarSUM
Temperature, water deg. fahrenheit30-day average≤ 163.6 deg FAprSUM
Temperature, water deg. fahrenheit30-day average≤ 152.4 deg FJunSUM
Temperature, water deg. fahrenheit30-day average≤ 126 deg FSepSUM
Temperature, water deg. fahrenheit30-day average≤ 110.8 deg FNovSUM
Temperature, water deg. fahrenheit30-day average≤ 114.2 deg FOctSUM
Temperature, water deg. fahrenheit30-day average≤ 125.4 deg FAugSUM
Temperature, water deg. fahrenheit30-day average≤ 103 deg FDecSUM
Temperature, water deg. fahrenheit30-day average≤ 130.2 deg FJulSUM
Temperature, water deg. fahrenheit30-day average≤ 163.4 deg FMaySUM
Temperature, water deg. fahrenheit30-day average≤ 103 deg FJanSUM
Temperature, water deg. fahrenheitdaily maximum≤ 134.6 deg FFebSUM
Temperature, water deg. fahrenheitdaily maximum≤ 167.3 deg FMarSUM
Temperature, water deg. fahrenheitdaily maximum≤ 212 deg FAprSUM
Temperature, water deg. fahrenheitdaily maximum≤ 187.2 deg FJunSUM
Temperature, water deg. fahrenheitdaily maximum≤ 154 deg FSepSUM
Temperature, water deg. fahrenheitdaily maximum≤ 201.7 deg FNovSUM
Temperature, water deg. fahrenheitdaily maximum≤ 175.4 deg FOctSUM
Temperature, water deg. fahrenheitdaily maximum≤ 125.4 deg FAugSUM
Temperature, water deg. fahrenheitdaily maximum≤ 151.1 deg FDecSUM
Temperature, water deg. fahrenheitdaily maximum≤ 130.2 deg FJulSUM
Temperature, water deg. fahrenheitdaily maximum≤ 212 deg FMaySUM
Temperature, water deg. fahrenheitdaily maximum≤ 135.7 deg FJanSUM
BOD, 5-day, 20 deg. C30-day average≤ 22936 lb/dall yearSUM
BOD, 5-day, 20 deg. Cdaily maximum≤ 50725 lb/dall yearSUM
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all yearSUM
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all yearSUM
BOD, 5-day, 20 deg. C30-day averagereport only (lb/d)all yearSUM
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)all yearSUM
Solids, total suspended30-day average≤ 16932 lb/dall yearSUM
Solids, total suspendeddaily maximum≤ 63248 lb/dall yearSUM
Solids, total suspended30-day averagereport only (mg/L)all yearSUM
Solids, total suspendeddaily maximumreport only (mg/L)all yearSUM
Solids, total suspended30-day averagereport only (lb/d)all yearSUM
Solids, total suspendeddaily maximumreport only (lb/d)all yearSUM
Temperature, length of excursiondaily maximum≤ 87.6 hr/12moall yearSUM

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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Your permit document is the final word. As JSON: /api/v1/permits/IA0003441 · MCP: https://passage-data.com/mcp