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Iron Ores, major discharger, Ishpeming, Michigan. NPDES permit MI0038369 expired Oct 1, 2026; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | daily minimum | = 6 SU | all year | 002 |
| pH | daily minimum | ≥ 6.5 SU | all year | 002 |
| pH | daily maximum | = 9 SU | all year | 002 |
| pH | daily maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | monthly average | = 20 mg/L | all year | 002 |
| Solids, total suspended | daily maximum | = 30 mg/L | all year | 002 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year | 002 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 002 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 002 |
| Arsenic, total [as As] | daily maximum | report only (ug/L) | all year | 002 |
| Copper, total [as Cu] | daily maximum | report only (ug/L) | all year | 002 |
| Iron, dissolved [as Fe] | monthly average | = 1 mg/L | all year | 002 |
| Iron, dissolved [as Fe] | daily maximum | = 2 mg/L | all year | 002 |
| Vanadium, total [as V] | daily maximum | report only (ug/L) | all year | 002 |
| Selenium, total [as Se] | monthly average | ≤ 5.1 ug/L | all year | 002 |
| Selenium, total [as Se] | daily maximum | report only (ug/L) | all year | 002 |
| Selenium, total [as Se] | monthly average | ≤ 1.1 lb/d | all year | 002 |
| Selenium, total [as Se] | daily maximum | report only (lb/d) | all year | 002 |
| Toxicity, choice of species | monthly average | report only (tox chronic) | all year | 002 |
| Toxicity, choice of species | daily maximum | report only (tox chronic) | all year | 002 |
| Toxicity, choice of species | monthly average | ≤ 1 tox chronic | all year | 002 |
| Toxicity, choice of species | daily maximum | report only (tox chronic) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Chlorine, total residual | daily minimum | report only (mg/L) | all year | 002 |
| Hematite Production | daily maximum | report only (N=0;Y=1) | all year | 002 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | report only (tox acute) | all year | 002 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | report only (tox acute) | all year | 002 |
| Solids, total dissolved | monthly average | report only (mg/L) | all year | 002 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 002 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | all year | 002 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 002 |
| Mercury, total [as Hg] | monthly average | report only (lb/d) | all year | 002 |
| Mercury, total [as Hg] | daily maximum | report only (lb/d) | all year | 002 |
| Coliform, fecal general | daily maximum | report only (#/100mL) | all year | 002 |
| Outfall observation,visual, y/n response | value | report only (N=0;Y=1) | all year | 002 |
| TU Static 24 Hr Acute Pimephales promelas | daily maximum | report only (tox acute) | all year | 002 |
| Static 48 Hr Chronic Pimphales Promelas | monthly average | report only (tox chronic) | all year | 002 |
| Static 48 Hr Chronic Pimphales Promelas | daily maximum | report only (tox chronic) | all year | 002 |
| pH | daily minimum | ≥ 6.5 SU | all year | 003 |
| pH | daily maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 003 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 003 |
| Arsenic, total [as As] | daily maximum | report only (ug/L) | all year | 003 |
| Cadmium, total [as Cd] | daily maximum | report only (ug/L) | all year | 003 |
| Copper, total [as Cu] | daily maximum | report only (ug/L) | all year | 003 |
| Iron, dissolved [as Fe] | monthly average | ≤ 1 mg/L | all year | 003 |
| Iron, dissolved [as Fe] | daily maximum | ≤ 2 mg/L | all year | 003 |
| Lead, total [as Pb] | daily maximum | report only (ug/L) | all year | 003 |
| Nickel, total [as Ni] | daily maximum | report only (ug/L) | all year | 003 |
| Zinc, total [as Zn] | daily maximum | report only (ug/L) | all year | 003 |
| Selenium, total [as Se] | monthly average | ≤ 7.1 ug/L | all year | 003 |
| Selenium, total [as Se] | daily maximum | report only (ug/L) | all year | 003 |
| Selenium, total [as Se] | monthly average | ≤ .2 lb/d | all year | 003 |
| Selenium, total [as Se] | daily maximum | report only (lb/d) | all year | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| Solids, total dissolved | monthly average | report only (mg/L) | all year | 003 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 003 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | all year | 003 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 003 |
| Mercury, total [as Hg] | monthly average | report only (lb/d) | all year | 003 |
| Mercury, total [as Hg] | daily maximum | report only (lb/d) | all year | 003 |
| Outfall observation,visual, y/n response | value | report only (N=0;Y=1) | all year | 003 |
Cited limits by parameter: Michigan's rules and the federal ones.
Same industry: the 6 Metal Mining permits in Michigan.
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Your permit document is the final word. As JSON: /api/v1/permits/MI0038369 · MCP: https://passage-data.com/mcp