Empire Iron Mining Partnership

NPDES permit MI0000094 · Major NON-POTW · effective, expires 2026-10-01 · 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.

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

0values over a limit
142required values missing, on 14 form(s)
0of 43 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 21 days after each monitoring period ends (the most common figure among MI permits in EPA's filings — check your permit).

Limits in force (65)

OutfallParameterStatisticLimitMonths
001Flow rateDAILY MN report only all year
001Flow rateDA report only all year
001Oxygen, dissolved [DO]DAILY MN report only all year
001Oxygen, dissolved [DO]DAILY MN >= 6 mg/L all year
001pHDAILY MN >= 6.5 SU all year
001pHDAILY MX <= 9 SU all year
001Solids, total suspendedMO AVG <= 20 mg/L all year
001Solids, total suspendedDAILY MX <= 30 mg/L all year
001Nitrogen, ammonia total [as N]MO AVG = 3.5 mg/L Jan, Feb, Mar, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 1 mg/L Apr, May, Oct, Nov
001Nitrogen, ammonia total [as N]DAILY MX report only Jan, Feb, Mar, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= .5 mg/L Jun, Jul, Aug, Sep
001Phosphorus, total [as P]MO AVG <= 1 mg/L all year
001Phosphorus, total [as P]DAILY MX report only all year
001Phosphorus, total [as P]MO AVG <= 267 lb/d all year
001Phosphorus, total [as P]DAILY MX report only all year
001Chloride [as Cl]DAILY MX report only all year
001Sulfate, total [as SO4]DAILY MX report only all year
001Fluoride, total [as F]DAILY MX report only all year
001Iron, dissolved [as Fe]MO AVG <= 1 mg/L all year
001Iron, dissolved [as Fe]DAILY MX <= 2 mg/L all year
001Selenium, total [as Se]MO AVG <= 5 ug/L all year
001Selenium, total [as Se]DAILY MX report only all year
001Selenium, total [as Se]MO AVG <= 1.3 lb/d all year
001Selenium, total [as Se]DAILY MX report only all year
001Toxicity, choice of speciesMO AVG report only all year
001Toxicity, choice of speciesVALUE report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residualDAILY MN report only all year
001Toxicity [acute], Ceriodaphnia dubiaDAILY MX report only all year
001Solids, total dissolvedDAILY MX report only all year
001Coliform, fecal generalDAILY MX report only all year
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 20 mg/L Oct, Nov
001BOD, carbonaceous [5 day, 20 C]DAILY MX = 45 mg/L Jan, Feb, Mar, Dec
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 9 mg/L Apr, May
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 2.5 mg/L Jun, Jul, Aug, Sep
001Outfall observation,visual, y/n responseVALUE report only all year
001TU Static 24 Hr Acute Pimephales promelasDAILY MX report only all year
001Static 48 Hr Chronic Pimphales PromelasMO AVG report only all year
001Static 48 Hr Chronic Pimphales PromelasVALUE report only all year
002Oxygen, dissolved [DO]DAILY MN report only all year
002pHDAILY MN >= 6.5 SU all year
002pHDAILY MX <= 9 SU all year
002Solids, total suspendedMO AVG <= 20 mg/L all year
002Solids, total suspendedDAILY MX <= 30 mg/L all year
002Chloride [as Cl]DAILY MX report only all year
002Sulfate, total [as SO4]DAILY MX report only all year
002Fluoride, total [as F]DAILY MX report only all year
002Iron, dissolved [as Fe]MO AVG <= 1 mg/L all year
002Iron, dissolved [as Fe]DAILY MX <= 2 mg/L all year
002Selenium, total [as Se]MO AVG = 5.2 ug/L all year
002Selenium, total [as Se]DAILY MX report only all year
002Selenium, total [as Se]MO AVG = .5 lb/d all year
002Selenium, total [as Se]DAILY MX report only all year
002Toxicity, choice of speciesMO AVG report only all year
002Toxicity, choice of speciesVALUE report only all year
002Flow, in conduit or thru treatment plantMO AVG report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
002Toxicity [acute], Ceriodaphnia dubiaDAILY MX report only all year
002Solids, total dissolvedDAILY MX report only all year
002Outfall observation,visual, y/n responseVALUE report only all year
002TU Static 24 Hr Acute Pimephales promelasDAILY MX report only all year
002Static 48 Hr Chronic Pimphales PromelasMO AVG report only all year
002Static 48 Hr Chronic Pimphales PromelasVALUE report only 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