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Iron Ores, Nashwauk, Minnesota. NPDES permit MN0068241, in force until Feb 28, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Specific conductance | quarterly maximum | report only (umho/cm) | Mar, Jun, Sep, Dec | D006 |
| pH | monthly minimum | ≥ 6 SU | all year | D006 |
| pH | monthly maximum | ≤ 9 SU | all year | D006 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | D006 |
| Solids, total suspended | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D006 |
| Solids, total suspended | monthly maximum | ≤ 30 mg/L | all year | D006 |
| Nitrogen, total [as N] | annual maximum | report only (mg/L) | Dec | D006 |
| Nitrogen, Kjeldahl, total [as N] | annual maximum | report only (mg/L) | Dec | D006 |
| Nitrite + Nitrate total [as N] | annual maximum | report only (mg/L) | Dec | D006 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | D006 |
| Phosphorus, total [as P] | monthly maximum | report only (mg/L) | all year | D006 |
| Sulfate, total [as SO4] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D006 |
| Iron, dissolved [as Fe] | monthly average | ≤ 1 mg/L | all year | D006 |
| Iron, dissolved [as Fe] | daily maximum | ≤ 2 mg/L | all year | D006 |
| Oil and grease | monthly average | report only (mg/L) | all year | D006 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D006 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D006 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D006 |
| Solids, total dissolved | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D006 |
| Mercury, dissolved [as Hg] | quarterly maximum | report only (ng/L) | Mar, Jun, Sep, Dec | D006 |
| Mercury, total [as Hg] | quarterly maximum | report only (ng/L) | Mar, Jun, Sep, Dec | D006 |
| Specific conductance | quarterly maximum | report only (umho/cm) | Mar, Jun, Sep, Dec | D007 |
| pH | monthly minimum | ≥ 6 SU | all year | D007 |
| pH | monthly maximum | ≤ 9 SU | all year | D007 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | D007 |
| Solids, total suspended | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D007 |
| Solids, total suspended | monthly maximum | ≤ 30 mg/L | all year | D007 |
| Nitrogen, total [as N] | annual maximum | report only (mg/L) | Dec | D007 |
| Nitrogen, Kjeldahl, total [as N] | annual maximum | report only (mg/L) | Dec | D007 |
| Nitrite + Nitrate total [as N] | annual maximum | report only (mg/L) | Dec | D007 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | D007 |
| Phosphorus, total [as P] | monthly maximum | report only (mg/L) | all year | D007 |
| Sulfate, total [as SO4] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D007 |
| Iron, dissolved [as Fe] | monthly average | ≤ 1 mg/L | all year | D007 |
| Iron, dissolved [as Fe] | daily maximum | ≤ 2 mg/L | all year | D007 |
| Oil and grease | monthly average | report only (mg/L) | all year | D007 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D007 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D007 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D007 |
| Solids, total dissolved | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D007 |
| Mercury, dissolved [as Hg] | quarterly maximum | report only (ng/L) | Mar, Jun, Sep, Dec | D007 |
| Mercury, total [as Hg] | quarterly maximum | report only (ng/L) | Mar, Jun, Sep, Dec | D007 |
| Specific conductance | quarterly maximum | report only (umho/cm) | all year | D008 |
| pH | minimum | report only (SU) | Dec | D008 |
| pH | annual maximum | report only (SU) | Dec | D008 |
| Solids, total suspended | annual average | report only (mg/L) | Dec | D008 |
| Nitrite + Nitrate total [as N] | annual average | report only (mg/L) | Dec | D008 |
| Sulfate, total [as SO4] | quarterly maximum | report only (mg/L) | all year | D008 |
| Arsenic, total [as As] | annual average | report only (mg/L) | Dec | D008 |
| Cadmium, total [as Cd] | annual average | report only (mg/L) | Dec | D008 |
| Copper, total [as Cu] | annual average | report only (mg/L) | Dec | D008 |
| Iron, total [as Fe] | annual average | report only (mg/L) | Dec | D008 |
| Lead, total [as Pb] | annual average | report only (mg/L) | Dec | D008 |
| Nickel, total [as Ni] | annual average | report only (mg/L) | Dec | D008 |
| Silver, total [as Ag] | annual average | report only (mg/L) | Dec | D008 |
| Zinc, total [as Zn] | annual average | report only (mg/L) | Dec | D008 |
| Antimony, total [as Sb] | annual average | report only (mg/L) | Dec | D008 |
| Selenium, total [as Se] | annual average | report only (mg/L) | Dec | D008 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | annual average | report only (mg/L) | Dec | D008 |
| Solids, total dissolved | quarterly maximum | report only (mg/L) | all year | D008 |
| Chemical Oxygen Demand [COD] | annual average | report only (mg/L) | Dec | D008 |
| Specific conductance | quarterly maximum | report only (umho/cm) | all year | D009 |
| pH | minimum | report only (SU) | Dec | D009 |
| pH | annual maximum | report only (SU) | Dec | D009 |
| Solids, total suspended | annual average | report only (mg/L) | Dec | D009 |
| Nitrite + Nitrate total [as N] | annual average | report only (mg/L) | Dec | D009 |
| Sulfate, total [as SO4] | quarterly maximum | report only (mg/L) | all year | D009 |
| Arsenic, total [as As] | annual average | report only (mg/L) | Dec | D009 |
| Cadmium, total [as Cd] | annual average | report only (mg/L) | Dec | D009 |
| Copper, total [as Cu] | annual average | report only (mg/L) | Dec | D009 |
| Iron, total [as Fe] | annual average | report only (mg/L) | Dec | D009 |
| Lead, total [as Pb] | annual average | report only (mg/L) | Dec | D009 |
| Nickel, total [as Ni] | annual average | report only (mg/L) | Dec | D009 |
| Silver, total [as Ag] | annual average | report only (mg/L) | Dec | D009 |
| Zinc, total [as Zn] | annual average | report only (mg/L) | Dec | D009 |
| Antimony, total [as Sb] | annual average | report only (mg/L) | Dec | D009 |
| Selenium, total [as Se] | annual average | report only (mg/L) | Dec | D009 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | annual average | report only (mg/L) | Dec | D009 |
| Solids, total dissolved | annual maximum | report only (mg/L) | all year | D009 |
| Chemical Oxygen Demand [COD] | annual average | report only (mg/L) | Dec | D009 |
| Temperature, water deg. centigrade | monthly maximum | report only (deg C) | Jun, Aug | W010 |
| Redox [oxidation reduction potential] | monthly minimum | report only (mv) | Jun, Aug | W010 |
| Redox [oxidation reduction potential] | monthly maximum | report only (mv) | Jun, Aug | W010 |
| Specific conductance | monthly maximum | report only (umho/cm) | Jun, Aug | W010 |
| Oxygen, dissolved [DO] | monthly minimum | report only (mg/L) | Jun, Aug | W010 |
| pH | monthly minimum | report only (SU) | Jun, Aug | W010 |
| pH | monthly maximum | report only (SU) | Jun, Aug | W010 |
| Alkalinity, total [as CaCO3] | monthly maximum | report only (mg/L) | Jun, Aug | W010 |
| Solids, total suspended | monthly maximum | report only (mg/L) | Jun, Aug | W010 |
| Nitrite + Nitrate total [as N] | monthly maximum | report only (mg/L) | Jun, Aug | W010 |
| Phosphorus, total [as P] | monthly maximum | report only (mg/L) | Jun, Aug | W010 |
| Hardness, total [as CaCO3] | monthly maximum | report only (mg/L) | Jun, Aug | W010 |
| Calcium, total [as Ca] | monthly maximum | report only (mg/L) | Jun, Aug | W010 |
| Magnesium, total [as Mg] | monthly maximum | report only (mg/L) | Jun, Aug | W010 |
| Sodium, total [as Na] | monthly maximum | report only (mg/L) | Jun, Aug | W010 |
| Chloride [as Cl] | monthly maximum | report only (mg/L) | Jun, Aug | W010 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | Jun, Aug | W010 |
| Fluoride, total [as F] | monthly maximum | report only (mg/L) | Jun, Aug | W010 |
| Iron, total [as Fe] | monthly maximum | report only (ug/L) | Jun, Aug | W010 |
| Manganese, total [as Mn] | monthly maximum | report only (mg/L) | Jun, Aug | W010 |
| Chlorophyll A | monthly maximum | report only (mg/L) | Jun, Aug | W010 |
| Solids, total dissolved | monthly maximum | report only (mg/L) | Jun, Aug | W010 |
| Phosphorous, in total orthophosphate | monthly maximum | report only (mg/L) | Jun, Aug | W010 |
| Temperature, water deg. centigrade | monthly maximum | report only (deg C) | Jun, Aug | W011 |
| Redox [oxidation reduction potential] | monthly minimum | report only (mv) | Jun, Aug | W011 |
| Redox [oxidation reduction potential] | monthly maximum | report only (mv) | Jun, Aug | W011 |
| Specific conductance | monthly maximum | report only (umho/cm) | Jun, Aug | W011 |
| Oxygen, dissolved [DO] | monthly minimum | report only (mg/L) | Jun, Aug | W011 |
| pH | monthly minimum | report only (SU) | Jun, Aug | W011 |
| pH | monthly maximum | report only (SU) | Jun, Aug | W011 |
| Alkalinity, total [as CaCO3] | monthly maximum | report only (mg/L) | Jun, Aug | W011 |
| Solids, total suspended | monthly maximum | report only (mg/L) | Jun, Aug | W011 |
| Nitrite + Nitrate total [as N] | monthly maximum | report only (mg/L) | Jun, Aug | W011 |
| Phosphorus, total [as P] | monthly maximum | report only (mg/L) | Jun, Aug | W011 |
| Hardness, total [as CaCO3] | monthly maximum | report only (mg/L) | Jun, Aug | W011 |
| Calcium, total [as Ca] | monthly maximum | report only (mg/L) | Jun, Aug | W011 |
| Magnesium, total [as Mg] | monthly maximum | report only (mg/L) | Jun, Aug | W011 |
| Sodium, total [as Na] | monthly maximum | report only (mg/L) | Jun, Aug | W011 |
| Chloride [as Cl] | monthly maximum | report only (mg/L) | Jun, Aug | W011 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | Jun, Aug | W011 |
| Fluoride, total [as F] | monthly maximum | report only (mg/L) | Jun, Aug | W011 |
| Iron, total [as Fe] | monthly maximum | report only (ug/L) | Jun, Aug | W011 |
| Manganese, total [as Mn] | monthly maximum | report only (mg/L) | Jun, Aug | W011 |
| Chlorophyll A | monthly maximum | report only (mg/L) | Jun, Aug | W011 |
| Solids, total dissolved | monthly maximum | report only (mg/L) | Jun, Aug | W011 |
| Phosphorous, in total orthophosphate | monthly maximum | report only (mg/L) | Jun, Aug | W011 |
| Temperature, water deg. centigrade | monthly maximum | report only (deg C) | Jun, Aug | W012 |
| Redox [oxidation reduction potential] | monthly minimum | report only (mv) | Jun, Aug | W012 |
| Redox [oxidation reduction potential] | monthly maximum | report only (mv) | Jun, Aug | W012 |
| Specific conductance | monthly maximum | report only (umho/cm) | Jun, Aug | W012 |
| Oxygen, dissolved [DO] | monthly minimum | report only (mg/L) | Jun, Aug | W012 |
| pH | monthly minimum | report only (SU) | Jun, Aug | W012 |
| pH | monthly maximum | report only (SU) | Jun, Aug | W012 |
| Alkalinity, total [as CaCO3] | monthly maximum | report only (mg/L) | Jun, Aug | W012 |
| Solids, total suspended | monthly maximum | report only (mg/L) | Jun, Aug | W012 |
| Nitrite + Nitrate total [as N] | monthly maximum | report only (mg/L) | Jun, Aug | W012 |
| Phosphorus, total [as P] | monthly maximum | report only (mg/L) | Jun, Aug | W012 |
| Hardness, total [as CaCO3] | monthly maximum | report only (mg/L) | Jun, Aug | W012 |
| Calcium, total [as Ca] | monthly maximum | report only (mg/L) | Jun, Aug | W012 |
| Magnesium, total [as Mg] | monthly maximum | report only (mg/L) | Jun, Aug | W012 |
| Sodium, total [as Na] | monthly maximum | report only (mg/L) | Jun, Aug | W012 |
| Chloride [as Cl] | monthly maximum | report only (mg/L) | Jun, Aug | W012 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | May, Jun, Aug, Sep | W012 |
| Fluoride, total [as F] | monthly maximum | report only (mg/L) | Jun, Aug | W012 |
| Iron, total [as Fe] | monthly maximum | report only (ug/L) | Jun, Aug | W012 |
| Manganese, total [as Mn] | monthly maximum | report only (mg/L) | Jun, Aug | W012 |
| Chlorophyll A | monthly maximum | report only (mg/L) | Jun, Aug | W012 |
| Solids, total dissolved | monthly maximum | report only (mg/L) | Jun, Aug | W012 |
| Phosphorous, in total orthophosphate | monthly maximum | report only (mg/L) | Jun, Aug | W012 |
| Temperature, water deg. centigrade | monthly maximum | report only (deg C) | Jun, Aug | W013 |
| Redox [oxidation reduction potential] | monthly minimum | report only (mv) | Jun, Aug | W013 |
| Redox [oxidation reduction potential] | monthly maximum | report only (mv) | Jun, Aug | W013 |
| Specific conductance | monthly maximum | report only (umho/cm) | Jun, Aug | W013 |
| Oxygen, dissolved [DO] | monthly minimum | report only (mg/L) | Jun, Aug | W013 |
| pH | monthly minimum | report only (SU) | Jun, Aug | W013 |
| pH | monthly maximum | report only (SU) | Jun, Aug | W013 |
| Alkalinity, total [as CaCO3] | monthly maximum | report only (mg/L) | Jun, Aug | W013 |
| Solids, total suspended | monthly maximum | report only (mg/L) | Jun, Aug | W013 |
| Nitrite + Nitrate total [as N] | monthly maximum | report only (mg/L) | Jun, Aug | W013 |
| Phosphorus, total [as P] | monthly maximum | report only (mg/L) | Jun, Aug | W013 |
| Hardness, total [as CaCO3] | monthly maximum | report only (mg/L) | Jun, Aug | W013 |
| Calcium, total [as Ca] | monthly maximum | report only (mg/L) | Jun, Aug | W013 |
| Magnesium, total [as Mg] | monthly maximum | report only (mg/L) | Jun, Aug | W013 |
| Sodium, total [as Na] | monthly maximum | report only (mg/L) | Jun, Aug | W013 |
| Chloride [as Cl] | monthly maximum | report only (mg/L) | Jun, Aug | W013 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | May, Jun, Aug, Sep | W013 |
| Fluoride, total [as F] | monthly maximum | report only (mg/L) | Jun, Aug | W013 |
| Iron, total [as Fe] | monthly maximum | report only (ug/L) | Jun, Aug | W013 |
| Manganese, total [as Mn] | monthly maximum | report only (mg/L) | Jun, Aug | W013 |
| Chlorophyll A | monthly maximum | report only (mg/L) | Jun, Aug | W013 |
| Solids, total dissolved | monthly maximum | report only (mg/L) | Jun, Aug | W013 |
| Phosphorous, in total orthophosphate | monthly maximum | report only (mg/L) | Jun, Aug | W013 |
| Temperature, water deg. centigrade | monthly maximum | report only (deg C) | Jun, Aug | W014 |
| Redox [oxidation reduction potential] | monthly minimum | report only (mv) | Jun, Aug | W014 |
| Redox [oxidation reduction potential] | monthly maximum | report only (mv) | Jun, Aug | W014 |
| Specific conductance | monthly maximum | report only (umho/cm) | Jun, Aug | W014 |
| Oxygen, dissolved [DO] | monthly minimum | report only (mg/L) | Jun, Aug | W014 |
| pH | monthly minimum | report only (SU) | Jun, Aug | W014 |
| pH | monthly maximum | report only (SU) | Jun, Aug | W014 |
| Alkalinity, total [as CaCO3] | monthly maximum | report only (mg/L) | Jun, Aug | W014 |
| Solids, total suspended | monthly maximum | report only (mg/L) | Jun, Aug | W014 |
| Nitrite + Nitrate total [as N] | monthly maximum | report only (mg/L) | Jun, Aug | W014 |
| Phosphorus, total [as P] | monthly maximum | report only (mg/L) | Jun, Aug | W014 |
| Hardness, total [as CaCO3] | monthly maximum | report only (mg/L) | Jun, Aug | W014 |
| Calcium, total [as Ca] | monthly maximum | report only (mg/L) | Jun, Aug | W014 |
| Magnesium, total [as Mg] | monthly maximum | report only (mg/L) | Jun, Aug | W014 |
| Sodium, total [as Na] | monthly maximum | report only (mg/L) | Jun, Aug | W014 |
| Chloride [as Cl] | monthly maximum | report only (mg/L) | Jun, Aug | W014 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | Jun, Aug | W014 |
| Fluoride, total [as F] | monthly maximum | report only (mg/L) | Jun, Aug | W014 |
| Iron, total [as Fe] | monthly maximum | report only (ug/L) | Jun, Aug | W014 |
| Manganese, total [as Mn] | monthly maximum | report only (mg/L) | Jun, Aug | W014 |
| Chlorophyll A | monthly maximum | report only (mg/L) | Jun, Aug | W014 |
| Solids, total dissolved | monthly maximum | report only (mg/L) | Jun, Aug | W014 |
| Phosphorous, in total orthophosphate | monthly maximum | report only (mg/L) | Jun, Aug | W014 |
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/MN0068241 · MCP: https://passage-data.com/mcp