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United States Gypsum Company

Reconstituted Wood Products, Mediapolis, Iowa. NPDES permit IA0063606, in force until Oct 31, 2028. Last 12 months: no values over a limit, 6 of 24 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (6 values), outfall 002 form A monthly (8 values)
Renewal application due
May 4, 2028 · 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, 4 of 24 reports late

Limits in force (14)

ParameterStatisticLimitMonthsOutfall
pHdaily minimum≥ 6.5 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspended30-day average≤ 80 mg/Lall year001
Solids, total suspended7-day average≤ 120 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/Lall year001
pHdaily minimum≥ 6.5 SUall year002
pHdaily maximum≤ 9 SUall year002
Solids, total suspended30-day average≤ 30 mg/Lall year002
Solids, total suspended7-day average≤ 45 mg/Lall year002
Sulfate, total [as SO4]30-day average≤ 1830 mg/Lall year002
Sulfate, total [as SO4]daily maximum≤ 1830 mg/Lall year002
Sulfate, total [as SO4]30-day average≤ 9674 lb/dall year002
Sulfate, total [as SO4]daily maximum≤ 9674 lb/dall year002

New limits from Oct 1, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Chlorine, total residual, 30-day average0.035 mg/Lnew——
Chlorine, total residual, 30-day average0.017 lb/dnew——
Chlorine, total residual, daily maximum0.03 lb/dnew——
Chlorine, total residual, daily maximum0.061 mg/Lnew——
E. coli, geometric mean276 #/100mL (Mar–Nov)new——
Nitrogen, ammonia total [as N], 30-day average1.6 mg/L (Oct)new——
Nitrogen, ammonia total [as N], 30-day average0.8 lb/d (Oct)new——
Nitrogen, ammonia total [as N], 30-day average1.7 lb/d (Mar)new——
Nitrogen, ammonia total [as N], 30-day average0.5 lb/d (Sep)new——
Nitrogen, ammonia total [as N], 30-day average3.4 mg/L (Mar)new——
Nitrogen, ammonia total [as N], 30-day average0.9 lb/d (May)new——
Nitrogen, ammonia total [as N], 30-day average0.6 lb/d (Jun)new——
Nitrogen, ammonia total [as N], 30-day average1.8 mg/L (May)new——
Nitrogen, ammonia total [as N], 30-day average1 mg/L (Aug)new——
Nitrogen, ammonia total [as N], 30-day average1 mg/L (Jul)new——
Nitrogen, ammonia total [as N], 30-day average2.3 mg/L (Nov)new——
Nitrogen, ammonia total [as N], 30-day average0.5 lb/d (Jul)new——
Nitrogen, ammonia total [as N], 30-day average1.1 mg/L (Sep)new——
Nitrogen, ammonia total [as N], 30-day average0.5 lb/d (Aug)new——
Nitrogen, ammonia total [as N], 30-day average1.1 lb/d (Nov)new——
Nitrogen, ammonia total [as N], 30-day average1.3 mg/L (Jun)new——
Nitrogen, ammonia total [as N], 30-day average1.7 lb/d (Jan)new——
Nitrogen, ammonia total [as N], 30-day average3.4 mg/L (Jan)new——
Nitrogen, ammonia total [as N], 30-day average0.7 lb/d (Apr)new——
Nitrogen, ammonia total [as N], 30-day average1.5 mg/L (Apr)new——
Nitrogen, ammonia total [as N], 30-day average2.5 mg/L (Dec)new——
Nitrogen, ammonia total [as N], 30-day average1.2 lb/d (Dec)new——
Nitrogen, ammonia total [as N], 30-day average4 mg/L (Feb)new——
Nitrogen, ammonia total [as N], 30-day average1.9 lb/d (Feb)new——
Nitrogen, ammonia total [as N], daily maximum1.3 lb/d (Oct)new——
Nitrogen, ammonia total [as N], daily maximum2.7 mg/L (Oct)new——
Nitrogen, ammonia total [as N], daily maximum1.3 lb/d (Nov)new——
Nitrogen, ammonia total [as N], daily maximum1.9 lb/d (Mar)new——
Nitrogen, ammonia total [as N], daily maximum3.3 mg/L (Jun)new——
Nitrogen, ammonia total [as N], daily maximum2.7 mg/L (Aug)new——
Nitrogen, ammonia total [as N], daily maximum3.9 mg/L (Mar)new——
Nitrogen, ammonia total [as N], daily maximum3.3 mg/L (May)new——
Nitrogen, ammonia total [as N], daily maximum1.3 lb/d (Aug)new——
Nitrogen, ammonia total [as N], daily maximum1.6 lb/d (Jun)new——
Nitrogen, ammonia total [as N], daily maximum1.6 lb/d (Jul)new——
Nitrogen, ammonia total [as N], daily maximum2.7 mg/L (Sep)new——
Nitrogen, ammonia total [as N], daily maximum1.3 lb/d (Sep)new——
Nitrogen, ammonia total [as N], daily maximum2.7 mg/L (Nov)new——
Nitrogen, ammonia total [as N], daily maximum3.3 mg/L (Jul)new——
Nitrogen, ammonia total [as N], daily maximum1.6 lb/d (May)new——
Nitrogen, ammonia total [as N], daily maximum9.7 lb/d (Jan)new——
Nitrogen, ammonia total [as N], daily maximum20 mg/L (Jan)new——
Nitrogen, ammonia total [as N], daily maximum4.8 mg/L (Apr)new——
Nitrogen, ammonia total [as N], daily maximum2.3 lb/d (Apr)new——
Nitrogen, ammonia total [as N], daily maximum3.9 mg/L (Dec)new——
Nitrogen, ammonia total [as N], daily maximum1.9 lb/d (Dec)new——
Nitrogen, ammonia total [as N], daily maximum8.5 mg/L (Feb)new——
Nitrogen, ammonia total [as N], daily maximum4.1 lb/d (Feb)new——
Sulfate, total [as SO4], 30-day average1830 mg/Lnew——
Sulfate, total [as SO4], 30-day average967 lb/dnew——
Sulfate, total [as SO4], daily maximum967 lb/dnew——
Sulfate, total [as SO4], daily maximum1830 mg/Lnew——

How strict are these limits?

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

Same industry: the 3 Lumber and Wood Products permits in Iowa.

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