Unverferth MFG. Co., Inc. — NPDES permit IA0072231: limits, due date and EPA's record

Farm Machinery And Equipment, Shell Rock, Iowa. NPDES permit IA0072231 expired Jun 30, 2019; its limits still apply. Last 12 months: no values over a limit, 58 required values missing. Source: EPA ECHO, Oct 22, 2026.

Limits in force (58)

Parameter	Statistic	Limit	Months	Outfall
pH	daily minimum	≥ 6 SU	all year	003
pH	daily maximum	≤ 9 SU	all year	003
Solids, total suspended	30-day average	≤ 80 mg/L	all year	003
Solids, total suspended	7-day average	≤ 120 mg/L	all year	003
BOD, carbonaceous [5 day, 20 C]	30-day average	≤ 25 mg/L	all year	003
BOD, carbonaceous [5 day, 20 C]	7-day average	≤ 40 mg/L	all year	003
pH	daily minimum	≥ 6 SU	all year	009
pH	daily maximum	≤ 9 SU	all year	009
Solids, total suspended	30-day average	≤ 31 mg/L	all year	009
Solids, total suspended	daily maximum	≤ 60 mg/L	all year	009
Solids, total suspended	30-day average	≤ 1.836 lb/d	all year	009
Solids, total suspended	daily maximum	≤ 3.553 lb/d	all year	009
Oil & Grease	30-day average	≤ 26 mg/L	all year	009
Oil & Grease	daily maximum	≤ 52 mg/L	all year	009
Oil & Grease	30-day average	≤ 1.54 lb/d	all year	009
Oil & Grease	daily maximum	≤ 3.079 lb/d	all year	009
Cyanide, total [as CN]	30-day average	≤ .3451 mg/L	all year	009
Cyanide, total [as CN]	daily maximum	≤ .3451 mg/L	all year	009
Cyanide, total [as CN]	30-day average	≤ .03779 lb/d	all year	009
Cyanide, total [as CN]	daily maximum	≤ .03779 lb/d	all year	009
Cadmium, total [as Cd]	30-day average	≤ .06771 mg/L	all year	009
Cadmium, total [as Cd]	daily maximum	≤ .06771 mg/L	all year	009
Cadmium, total [as Cd]	30-day average	≤ .007413 lb/d	all year	009
Cadmium, total [as Cd]	daily maximum	≤ .007413 lb/d	all year	009
Chromium, hexavalent [as Cr]	30-day average	≤ .251 mg/L	all year	009
Chromium, hexavalent [as Cr]	daily maximum	≤ .251 mg/L	all year	009
Chromium, hexavalent [as Cr]	30-day average	≤ .02748 lb/d	all year	009
Chromium, hexavalent [as Cr]	daily maximum	≤ .02748 lb/d	all year	009
Chromium, total [as Cr]	30-day average	≤ 1.71 mg/L	all year	009
Chromium, total [as Cr]	daily maximum	≤ 2.77 mg/L	all year	009
Chromium, total [as Cr]	30-day average	≤ .101 lb/d	all year	009
Chromium, total [as Cr]	daily maximum	≤ .164 lb/d	all year	009
Copper, total [as Cu]	30-day average	≤ .36 mg/L	all year	009
Copper, total [as Cu]	daily maximum	≤ .36 mg/L	all year	009
Copper, total [as Cu]	30-day average	≤ .03948 lb/d	all year	009
Copper, total [as Cu]	daily maximum	≤ .03948 lb/d	all year	009
Lead, total [as Pb]	30-day average	≤ .43 mg/L	all year	009
Lead, total [as Pb]	daily maximum	≤ .69 mg/L	all year	009
Lead, total [as Pb]	30-day average	≤ .025 lb/d	all year	009
Lead, total [as Pb]	daily maximum	≤ .041 lb/d	all year	009
Nickel, total [as Ni]	30-day average	≤ 2.38 mg/L	all year	009
Nickel, total [as Ni]	daily maximum	≤ 3.98 mg/L	all year	009
Nickel, total [as Ni]	30-day average	≤ .141 lb/d	all year	009
Nickel, total [as Ni]	daily maximum	≤ .236 lb/d	all year	009
Silver, total [as Ag]	30-day average	≤ .05962 mg/L	all year	009
Silver, total [as Ag]	daily maximum	≤ .05962 mg/L	all year	009
Silver, total [as Ag]	30-day average	≤ .006527 lb/d	all year	009
Silver, total [as Ag]	daily maximum	≤ .006527 lb/d	all year	009
Zinc, total [as Zn]	30-day average	≤ 1.48 mg/L	all year	009
Zinc, total [as Zn]	daily maximum	≤ 2.61 mg/L	all year	009
Zinc, total [as Zn]	30-day average	≤ .088 lb/d	all year	009
Zinc, total [as Zn]	daily maximum	≤ .155 lb/d	all year	009
Chlorine, total residual	30-day average	≤ 1.047 mg/L	all year	009
Chlorine, total residual	daily maximum	≤ 1.047 mg/L	all year	009
Chlorine, total residual	30-day average	≤ .1228 lb/d	all year	009
Chlorine, total residual	daily maximum	≤ .1228 lb/d	all year	009
Organics, total toxic [TTO]	daily maximum	≤ 2.13 mg/L	all year	009
Organics, total toxic [TTO]	daily maximum	≤ .126 lb/d	all year	009

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/IA0072231 · MCP: https://passage-data.com/mcp