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Iron Ores, major discharger, Palmer, Michigan. NPDES permit MI0000094 expired Oct 1, 2026; its limits still apply. Last 12 months: no values over a limit, 140 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Flow rate | daily minimum | report only (cfs) | all year | 001 |
| Flow rate | daily geometric mean | report only (cfs) | all year | 001 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | all year | 001 |
| pH | daily minimum | ≥ 6.5 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | = 3.5 mg/L | Jan, Feb, Mar, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1 mg/L | Apr, May, Oct, Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ .5 mg/L | Jun–Sep | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 267 lb/d | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year | 001 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 001 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 001 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 001 |
| Iron, dissolved [as Fe] | monthly average | ≤ 1 mg/L | all year | 001 |
| Iron, dissolved [as Fe] | daily maximum | ≤ 2 mg/L | all year | 001 |
| Selenium, total [as Se] | monthly average | ≤ 5 ug/L | all year | 001 |
| Selenium, total [as Se] | daily maximum | report only (ug/L) | all year | 001 |
| Selenium, total [as Se] | monthly average | ≤ 1.3 lb/d | all year | 001 |
| Selenium, total [as Se] | daily maximum | report only (lb/d) | all year | 001 |
| Toxicity, choice of species | monthly average | report only (tox chronic) | all year | 001 |
| Toxicity, choice of species | value | report only (tox chronic) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | daily minimum | report only (mg/L) | all year | 001 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | report only (tox acute) | all year | 001 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 001 |
| Coliform, fecal general | daily maximum | report only (#/100mL) | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 20 mg/L | Oct, Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | = 45 mg/L | Jan, Feb, Mar, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 9 mg/L | Apr, May | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 2.5 mg/L | Jun–Sep | 001 |
| Outfall observation,visual, y/n response | value | report only (N=0;Y=1) | all year | 001 |
| TU Static 24 Hr Acute Pimephales promelas | daily maximum | report only (tox acute) | all year | 001 |
| Static 48 Hr Chronic Pimphales Promelas | monthly average | report only (tox chronic) | all year | 001 |
| Static 48 Hr Chronic Pimphales Promelas | value | report only (tox chronic) | all year | 001 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 002 |
| pH | daily minimum | ≥ 6.5 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 |
| 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 |
| Fluoride, total [as F] | daily maximum | report only (mg/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 |
| Selenium, total [as Se] | monthly average | = 5.2 ug/L | all year | 002 |
| Selenium, total [as Se] | daily maximum | report only (ug/L) | all year | 002 |
| Selenium, total [as Se] | monthly average | = .5 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 | value | 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 | daily maximum | report only (MGD) | all year | 002 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | report only (tox acute) | all year | 002 |
| Solids, total dissolved | daily maximum | report only (mg/L) | 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 | value | report only (tox chronic) | all year | 002 |
Cited limits by parameter: Michigan's rules and the federal ones.
Same industry: the 6 Metal Mining permits in Michigan.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/MI0000094 · MCP: https://passage-data.com/mcp