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Larchwood 1447 LLC

Biological Products Except Diagnostic, Larchwood, Iowa. NPDES permit IA0052919 expired Jan 31, 2024; its limits still apply. Last 12 months: no values over a limit, 275 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (25 values)
Last report on file
None
Oct 2024 – Sep 2025
0 values over a limit, 300 required values missing, 0 of 12 reports late

Limits in force (69)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 5 mg/Lall year
BOD, 5-day, 20 deg. C30-day average≤ 19 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 45 lb/dall year
Oxygen demand, chem. [high level] [COD]daily maximum≤ 110 mg/Lall year
Oxygen demand, chem. [high level] [COD]daily maximum≤ 55 lb/dall year
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 28 lb/dall year
Solids, total suspendeddaily maximum≤ 78 lb/dall year
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 2.1 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 2.3 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 1.7 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 15.2 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 16.5 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 16 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 14.2 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 14.4 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 17.6 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 15.7 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 15.7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 15.2 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 16.2 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 1.7 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 1 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ .5 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 1.2 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 2 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ .7 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 1.2 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ .5 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ .8 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ .8 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ .9 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ .5 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 7.6 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 7.3 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 8.3 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 8 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 7.1 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 7.2 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 7.3 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 8.8 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 7.9 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 7.9 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 7.6 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 8.1 lb/dAug
Chloride [as Cl]30-day average≤ 389 mg/Lall year
Chloride [as Cl]daily maximum≤ 629 mg/Lall year
Chloride [as Cl]30-day average≤ 194 lb/dall year
Chloride [as Cl]daily maximum≤ 315 lb/dall year
Copper, total [as Cu]30-day average≤ .01687 mg/Lall year
Copper, total [as Cu]daily maximum≤ .0269 mg/Lall year
Copper, total [as Cu]30-day average≤ .008441 lb/dall year
Copper, total [as Cu]daily maximum≤ .01346 lb/dall year
Mercury, total [as Hg]30-day average≤ .0009 mg/Lall year
Mercury, total [as Hg]daily maximum≤ .00164 mg/Lall year
Mercury, total [as Hg]30-day average≤ .0004504 lb/dall year
Mercury, total [as Hg]daily maximum≤ .0008207 lb/dall year

How strict are these limits?

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

Same industry: the 57 Chemicals and Allied Products permits in Iowa.

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