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Climax Molybdenum Company

Primary Nonferrous Metals, major discharger, Fort Madison, Iowa. NPDES permit IA0059978 expired Nov 30, 2025; its limits still apply. Last 12 months: over a limit 7 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (36 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
4 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
December 2025Molybdenum, total [as Mo], 30-day average10.718≤ 8.176 mg/L31%
December 2025Molybdenum, total [as Mo], 30-day average18.01936≤ 16.091 lb/d12%
June 2026Molybdenum, total [as Mo], 30-day average12.005≤ 8.176 mg/L47%
June 2026Molybdenum, total [as Mo], daily maximum17.4≤ 15.801 mg/L10%
July 2026Molybdenum, total [as Mo], 30-day average8.586≤ 8.176 mg/L5%
August 2026Molybdenum, total [as Mo], 30-day average10.685≤ 8.176 mg/L31%
August 2026Molybdenum, total [as Mo], daily maximum18≤ 15.801 mg/L14%

Limits in force (36)

ParameterStatisticLimitMonths
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 59.773 mg/Lall year
Solids, total suspendeddaily maximum≤ 119.546 mg/Lall year
Solids, total suspended30-day average≤ 117.648 lb/dall year
Solids, total suspendeddaily maximum≤ 235.296 lb/dall year
Fluoride, total [as F]30-day average≤ 19.985 mg/Lall year
Fluoride, total [as F]daily maximum≤ 35.152 mg/Lall year
Fluoride, total [as F]30-day average≤ 39.335 lb/dall year
Fluoride, total [as F]daily maximum≤ 69.188 lb/dall year
Arsenic, total [as As]30-day average≤ .623 mg/Lall year
Arsenic, total [as As]daily maximum≤ 1.396 mg/Lall year
Arsenic, total [as As]30-day average≤ 1.226 lb/dall year
Arsenic, total [as As]daily maximum≤ 2.748 lb/dall year
Cadmium, total [as Cd]30-day average≤ .08 mg/Lall year
Cadmium, total [as Cd]daily maximum≤ .201 mg/Lall year
Cadmium, total [as Cd]30-day average≤ .158 lb/dall year
Cadmium, total [as Cd]daily maximum≤ .396 lb/dall year
Copper, total [as Cu]30-day average≤ .613 mg/Lall year
Copper, total [as Cu]daily maximum≤ 1.286 mg/Lall year
Copper, total [as Cu]30-day average≤ 1.206 lb/dall year
Copper, total [as Cu]daily maximum≤ 2.53 lb/dall year
Lead, total [as Pb]30-day average≤ .131 mg/Lall year
Lead, total [as Pb]daily maximum≤ .281 mg/Lall year
Lead, total [as Pb]30-day average≤ .257 lb/dall year
Lead, total [as Pb]daily maximum≤ .553 lb/dall year
Molybdenum, total [as Mo]30-day average≤ 8.176 mg/Lall year
Molybdenum, total [as Mo]daily maximum≤ 15.801 mg/Lall year
Molybdenum, total [as Mo]30-day average≤ 16.091 lb/dall year
Molybdenum, total [as Mo]daily maximum≤ 31.099 lb/dall year
Zinc, total [as Zn]30-day average≤ .422 mg/Lall year
Zinc, total [as Zn]daily maximum≤ 1.024 mg/Lall year
Zinc, total [as Zn]30-day average≤ .831 lb/dall year
Zinc, total [as Zn]daily maximum≤ 2.016 lb/dall year
Toxicity [acute], Ceriodaphnia dubiadaily maximum≤ 1 N=0;Y=1all year
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximum≤ 1 N=0;Y=1all year

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/IA0059978 · MCP: https://passage-data.com/mcp