CLIMAX MOLYBDENUM COMPANY

NPDES permit IA0059978 · Major NON-POTW · administratively continued, expires 2025-11-30 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

This permit expired on 2025-11-30 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

EPA's record, 2025-09-01 to 2026-08-31

5values over a limit
0required values missing, on 0 form(s)
0of 11 forms filed late

Last period with anything received: 2026-07-31. Most often over: Molybdenum, total [as Mo] (5).

Reporting

Reports are due about 15 days after each monitoring period ends (the most common figure among IA permits in EPA's filings — check your permit).

Limits in force (36)

OutfallParameterStatisticLimitMonths
001pHDAILY MN >= 6 SU all year
001pHDAILY MX <= 9 SU all year
001Solids, total suspended30DA AVG <= 59.773 mg/L all year
001Solids, total suspendedDAILY MX <= 119.546 mg/L all year
001Solids, total suspended30DA AVG <= 117.648 lb/d all year
001Solids, total suspendedDAILY MX <= 235.296 lb/d all year
001Fluoride, total [as F]30DA AVG <= 19.985 mg/L all year
001Fluoride, total [as F]DAILY MX <= 35.152 mg/L all year
001Fluoride, total [as F]30DA AVG <= 39.335 lb/d all year
001Fluoride, total [as F]DAILY MX <= 69.188 lb/d all year
001Arsenic, total [as As]30DA AVG <= .623 mg/L all year
001Arsenic, total [as As]DAILY MX <= 1.396 mg/L all year
001Arsenic, total [as As]30DA AVG <= 1.226 lb/d all year
001Arsenic, total [as As]DAILY MX <= 2.748 lb/d all year
001Cadmium, total [as Cd]30DA AVG <= .08 mg/L all year
001Cadmium, total [as Cd]DAILY MX <= .201 mg/L all year
001Cadmium, total [as Cd]30DA AVG <= .158 lb/d all year
001Cadmium, total [as Cd]DAILY MX <= .396 lb/d all year
001Copper, total [as Cu]30DA AVG <= .613 mg/L all year
001Copper, total [as Cu]DAILY MX <= 1.286 mg/L all year
001Copper, total [as Cu]30DA AVG <= 1.206 lb/d all year
001Copper, total [as Cu]DAILY MX <= 2.53 lb/d all year
001Lead, total [as Pb]30DA AVG <= .131 mg/L all year
001Lead, total [as Pb]DAILY MX <= .281 mg/L all year
001Lead, total [as Pb]30DA AVG <= .257 lb/d all year
001Lead, total [as Pb]DAILY MX <= .553 lb/d all year
001Molybdenum, total [as Mo]30DA AVG <= 8.176 mg/L all year
001Molybdenum, total [as Mo]DAILY MX <= 15.801 mg/L all year
001Molybdenum, total [as Mo]30DA AVG <= 16.091 lb/d all year
001Molybdenum, total [as Mo]DAILY MX <= 31.099 lb/d all year
001Zinc, total [as Zn]30DA AVG <= .422 mg/L all year
001Zinc, total [as Zn]DAILY MX <= 1.024 mg/L all year
001Zinc, total [as Zn]30DA AVG <= .831 lb/d all year
001Zinc, total [as Zn]DAILY MX <= 2.016 lb/d all year
001Toxicity [acute], Ceriodaphnia dubiaDAILY MX <= 1 N=0;Y=1 all year
001Toxicity [acute], Pimephales promelas [Fathead Minnow]DAILY MX <= 1 N=0;Y=1 all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states