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Iron Ores, major discharger, Mountain Iron, Minnesota. NPDES permit MN0057207 expired Nov 30, 2023; its limits still apply. Last 12 months: no values over a limit, 1 required value missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | monthly maximum | report only (deg C) | all year | D012 |
| Specific conductance | monthly average | report only (umho/cm) | all year | D012 |
| pH | instantaneous minimum | ≥ 6 SU | all year | D012 |
| pH | instantaneous maximum | ≤ 9 SU | all year | D012 |
| Bicarbonate ion- [as HCO3] | monthly average | report only (mg/L) | all year | D012 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | D012 |
| Solids, total suspended | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D012 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | D012 |
| Solids, total suspended | monthly average | ≤ 36.4 kg/d | all year | D012 |
| Chloride [as Cl] | monthly average | report only (mg/L) | all year | D012 |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | all year | D012 |
| Iron, dissolved [as Fe] | monthly average | ≤ 1 mg/L | all year | D012 |
| Iron, dissolved [as Fe] | monthly maximum | ≤ 2 mg/L | all year | D012 |
| Manganese, dissolved [as Mn] | monthly average | report only (ug/L) | all year | D012 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | monthly average | report only (mg/L) | all year | D012 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D012 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | D012 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D012 |
| Solids, total dissolved | monthly average | report only (mg/L) | all year | D012 |
| Mercury, dissolved [as Hg] | quarterly maximum | report only (ng/L) | Mar, Jun, Sep, Dec | D012 |
| Mercury, total [as Hg] | quarterly maximum | report only (ng/L) | Mar, Jun, Sep, Dec | D012 |
| Temperature, water deg. centigrade | monthly maximum | report only (deg C) | all year | W016 |
| Stream flow, instantaneous | daily maximum | report only (cfs) | all year | W016 |
| Specific conductance | monthly maximum | report only (umho/cm) | all year | W016 |
| pH | monthly minimum | report only (SU) | all year | W016 |
| pH | monthly maximum | report only (SU) | all year | W016 |
| Bicarbonate ion- [as HCO3] | monthly maximum | report only (mg/L) | all year | W016 |
| Chloride [as Cl] | monthly maximum | report only (mg/L) | all year | W016 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | all year | W016 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | monthly maximum | report only (mg/L) | all year | W016 |
| Solids, total dissolved | monthly maximum | report only (mg/L) | all year | W016 |
| Temperature, water deg. centigrade | monthly maximum | report only (deg C) | all year | W025 |
| Specific conductance | monthly maximum | report only (umho/cm) | all year | W025 |
| pH | monthly minimum | report only (SU) | all year | W025 |
| pH | monthly maximum | report only (SU) | all year | W025 |
| Bicarbonate ion- [as HCO3] | monthly maximum | report only (mg/L) | all year | W025 |
| Chloride [as Cl] | monthly maximum | report only (mg/L) | all year | W025 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | all year | W025 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | monthly maximum | report only (mg/L) | all year | W025 |
| Solids, total dissolved | monthly maximum | report only (mg/L) | all year | W025 |
| Temperature, water deg. centigrade | monthly maximum | report only (deg C) | all year | W026 |
| Specific conductance | monthly maximum | report only (umho/cm) | all year | W026 |
| pH | monthly minimum | report only (SU) | all year | W026 |
| pH | monthly maximum | report only (SU) | all year | W026 |
| Bicarbonate ion- [as HCO3] | monthly maximum | report only (mg/L) | all year | W026 |
| Chloride [as Cl] | monthly maximum | report only (mg/L) | all year | W026 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | all year | W026 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | monthly maximum | report only (mg/L) | all year | W026 |
| Solids, total dissolved | monthly maximum | report only (mg/L) | all year | W026 |
| Temperature, water deg. centigrade | monthly maximum | report only (deg C) | all year | W027 |
| Specific conductance | monthly maximum | report only (umho/cm) | all year | W027 |
| pH | monthly minimum | report only (SU) | all year | W027 |
| pH | monthly maximum | report only (SU) | all year | W027 |
| Bicarbonate ion- [as HCO3] | monthly maximum | report only (mg/L) | all year | W027 |
| Chloride [as Cl] | monthly maximum | report only (mg/L) | all year | W027 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | all year | W027 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | monthly maximum | report only (mg/L) | all year | W027 |
| Solids, total dissolved | monthly maximum | report only (mg/L) | all year | W027 |
| Temperature, water deg. centigrade | monthly maximum | report only (deg C) | all year | W028 |
| Specific conductance | monthly maximum | report only (umho/cm) | all year | W028 |
| pH | monthly minimum | report only (SU) | all year | W028 |
| pH | monthly maximum | report only (SU) | all year | W028 |
| Bicarbonate ion- [as HCO3] | monthly maximum | report only (mg/L) | all year | W028 |
| Chloride [as Cl] | monthly maximum | report only (mg/L) | all year | W028 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | all year | W028 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | monthly maximum | report only (mg/L) | all year | W028 |
| Solids, total dissolved | monthly maximum | report only (mg/L) | all year | W028 |
| Temperature, water deg. centigrade | monthly maximum | report only (deg C) | all year | W030 |
| Specific conductance | monthly maximum | report only (umho/cm) | all year | W030 |
| pH | monthly minimum | report only (SU) | all year | W030 |
| pH | monthly maximum | report only (SU) | all year | W030 |
| Bicarbonate ion- [as HCO3] | monthly maximum | report only (mg/L) | all year | W030 |
| Chloride [as Cl] | monthly maximum | report only (mg/L) | all year | W030 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | all year | W030 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | monthly maximum | report only (mg/L) | all year | W030 |
| Solids, total dissolved | monthly maximum | report only (mg/L) | all year | W030 |
| Temperature, water deg. centigrade | monthly maximum | report only (deg C) | all year | W032 |
| Stream flow, instantaneous | daily maximum | report only (cfs) | all year | W032 |
| Specific conductance | monthly maximum | report only (umho/cm) | all year | W032 |
| pH | monthly minimum | report only (SU) | all year | W032 |
| pH | monthly maximum | report only (SU) | all year | W032 |
| Bicarbonate ion- [as HCO3] | monthly maximum | report only (mg/L) | all year | W032 |
| Chloride [as Cl] | monthly maximum | report only (mg/L) | all year | W032 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | all year | W032 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | monthly maximum | report only (mg/L) | all year | W032 |
| Solids, total dissolved | monthly maximum | report only (mg/L) | all year | W032 |
Cited limits by parameter: Minnesota's rules and the federal ones.
Same industry: the 7 Metal Mining permits in Minnesota.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/MN0057207 · MCP: https://passage-data.com/mcp