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Gerdau

Blast Furnaces And Steel Mills, Wilton, Iowa. NPDES permit IA0061972, in force until Feb 29, 2028. Last 12 months: over a limit 8 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (30 values)
Renewal application due
Sep 2, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
7 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
November 2025Iron, total [as Fe], daily maximum2.8≤ 1 mg/L180%
December 2025Copper, total [as Cu], daily maximum.073≤ .03898 mg/L87%
December 2025Iron, total [as Fe], daily maximum1.8≤ 1 mg/L80%
February 2026Copper, total [as Cu], daily maximum.065≤ .03898 mg/L67%
April 2026Copper, total [as Cu], daily maximum.064≤ .03898 mg/L64%
May 2026Copper, total [as Cu], 30-day average.048525≤ .03898 mg/L24%
May 2026Copper, total [as Cu], daily maximum.0639≤ .03898 mg/L64%
August 2026Copper, total [as Cu], daily maximum.0422≤ .03898 mg/L8%

Limits in force (30)

ParameterStatisticLimitMonths
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspendeddaily maximum≤ 45 mg/Lall year
Solids, total suspended30-day average≤ 22 lb/dall year
Solids, total suspendeddaily maximum≤ 33 lb/dall year
Oil & Grease30-day average≤ 10 mg/Lall year
Oil & Greasedaily maximum≤ 15 mg/Lall year
Oil & Grease30-day average≤ 7 lb/dall year
Oil & Greasedaily maximum≤ 11 lb/dall year
Copper, total [as Cu]30-day average≤ .03898 mg/Lall year
Copper, total [as Cu]daily maximum≤ .03898 mg/Lall year
Copper, total [as Cu]30-day average≤ .2711 lb/dall year
Copper, total [as Cu]daily maximum≤ .2711 lb/dall year
Iron, total [as Fe]30-day average≤ 1 mg/Lall year
Iron, total [as Fe]daily maximum≤ 1 mg/Lall year
Iron, total [as Fe]30-day average≤ 8.273 lb/dall year
Iron, total [as Fe]daily maximum≤ 8.273 lb/dall year
Lead, total [as Pb]30-day average≤ .062 mg/Lall year
Lead, total [as Pb]daily maximum≤ .185 mg/Lall year
Lead, total [as Pb]30-day average≤ .072 lb/dall year
Lead, total [as Pb]daily maximum≤ .216 lb/dall year
Zinc, total [as Zn]30-day average≤ .092 mg/Lall year
Zinc, total [as Zn]daily maximum≤ .243 mg/Lall year
Zinc, total [as Zn]30-day average≤ .108 lb/dall year
Zinc, total [as Zn]daily maximum≤ .324 lb/dall year
Chlorine, total residual30-day average≤ .052 mg/Lall year
Chlorine, total residualdaily maximum≤ .052 mg/Lall year
Chlorine, total residual30-day average≤ .219 lb/dall year
Chlorine, total residualdaily maximum≤ .219 lb/dall year

New limits from Feb 1, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Copper, total [as Cu], daily maximum0.0303 mg/Ltighter0.038 mg/L (11 values)1.25×
Copper, total [as Cu], 30-day average0.0303 mg/Ltighter0.02218 mg/L (11 values)0.732×
Copper, total [as Cu], 30-day average0.1768 lb/dtighter0.01695 lb/d (11 values)0.0958×
Copper, total [as Cu], daily maximum0.2273 lb/dtighter0.02615 lb/d (11 values)0.115×

How strict are these limits?

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

Same industry: the 7 Primary Metal Industries 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/IA0061972 · MCP: https://passage-data.com/mcp