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Iron Ores, major discharger, Silver Bay, Minnesota. NPDES permit MN0055301, in force until Jul 31, 2030. Last 12 months: no values over a limit, 6 required values missing, 5 of 84 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Turbidity | monthly average | ≤ 3 NTU | all year | D044 |
| Turbidity | daily maximum | report only (NTU) | all year | D044 |
| Redox [oxidation reduction potential] | quarterly maximum | report only (mv) | Mar, Jun, Sep, Dec | D044 |
| Specific conductance | quarterly maximum | report only (umho/cm) | Mar, Jun, Sep, Dec | D044 |
| pH | monthly minimum | ≥ 6.5 SU | all year | D044 |
| pH | monthly maximum | ≤ 8.5 SU | all year | D044 |
| Alkalinity, total [as CaCO3] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D044 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | D044 |
| Solids, total suspended | monthly maximum | ≤ 30 mg/L | all year | D044 |
| Solids, total suspended | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D044 |
| Nitrogen, total [as N] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D044 |
| Nitrogen, Kjeldahl, total [as N] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D044 |
| Nitrite + Nitrate total [as N] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D044 |
| Phosphorus, total [as P] | annual maximum | report only (mg/L) | Aug | D044 |
| Calcium, total [as Ca] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D044 |
| Magnesium, total [as Mg] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D044 |
| Sodium, total [as Na] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D044 |
| Potassium, total [as K] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D044 |
| Chloride [as Cl] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D044 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D044 |
| Asbestos | quarterly maximum | report only (MF/L) | Mar, Jun, Sep, Dec | D044 |
| Fluoride, total [as F] | monthly average | ≤ 4.8 mg/L | all year | D044 |
| Fluoride, total [as F] | daily maximum | ≤ 5.8 mg/L | all year | D044 |
| Asbestos, Chrysotile | quarterly maximum | report only (MF/L) | Mar, Jun, Sep, Dec | D044 |
| Asbestos, total amphibole | daily maximum | ≤ 6.8 MF/L | Mar, Jun, Sep, Dec | D044 |
| Fibers, ambiguous asbestos | quarterly maximum | report only (MF/L) | Mar, Jun, Sep, Dec | D044 |
| Fibers, non-amphibole, non-chrysotile asbestos | quarterly maximum | report only (MF/L) | Mar, Jun, Sep, Dec | D044 |
| Copper, total [as Cu] | annual maximum | report only (ug/L) | Aug | D044 |
| Iron, total [as Fe] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D044 |
| Iron, dissolved [as Fe] | monthly average | ≤ 1 mg/L | all year | D044 |
| Iron, dissolved [as Fe] | daily maximum | ≤ 2 mg/L | all year | D044 |
| Manganese, total [as Mn] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D044 |
| Molybdenum, total [as Mo] | monthly maximum | report only (ug/L) | all year | D044 |
| Diesel range organics diesel, total, wtr | quarterly maximum | report only (ug/L) | Mar, Jun, Sep, Dec | D044 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D044 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | D044 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D044 |
| Sodium, % total cations | quarterly maximum | report only (%) | Mar, Jun, Sep, Dec | D044 |
| Solids, total dissolved | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D044 |
| Mercury, dissolved [as Hg] | quarterly maximum | report only (ng/L) | Mar, Jun, Sep, Dec | D044 |
| Mercury, total [as Hg] | quarterly maximum | report only (ng/L) | Mar, Jun, Sep, Dec | D044 |
| Turbidity | monthly average | ≤ 3 NTU | all year | D045 |
| Turbidity | instantaneous maximum | report only (NTU) | all year | D045 |
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | D046 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | D046 |
| pH | monthly minimum | ≥ 6 SU | all year | D046 |
| pH | monthly maximum | ≤ 9 SU | all year | D046 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D046 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | D046 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D046 |
| Turbidity | monthly maximum | report only (NTU) | May, Jul, Oct | D048 |
| Redox [oxidation reduction potential] | monthly maximum | report only (mv) | May, Jul, Oct | D048 |
| Specific conductance | monthly maximum | report only (umho/cm) | May, Jul, Oct | D048 |
| pH | monthly minimum | ≥ 6 SU | May, Jul, Oct | D048 |
| pH | monthly maximum | ≤ 9 SU | May, Jul, Oct | D048 |
| Alkalinity, total [as CaCO3] | monthly maximum | report only (mg/L) | May, Jul, Oct | D048 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | May, Jul, Oct | D048 |
| Solids, total suspended | monthly maximum | ≤ 30 mg/L | May, Jul, Oct | D048 |
| Nitrogen, total [as N] | monthly maximum | report only (mg/L) | May, Jul, Oct | D048 |
| Nitrogen, Kjeldahl, total [as N] | monthly maximum | report only (mg/L) | May, Jul, Oct | D048 |
| Nitrite + Nitrate total [as N] | monthly maximum | report only (mg/L) | May, Jul, Oct | D048 |
| Calcium, total [as Ca] | monthly maximum | report only (mg/L) | May, Jul, Oct | D048 |
| Magnesium, total [as Mg] | monthly maximum | report only (mg/L) | May, Jul, Oct | D048 |
| Sodium, total [as Na] | monthly maximum | report only (mg/L) | May, Jul, Oct | D048 |
| Potassium, total [as K] | monthly maximum | report only (mg/L) | May, Jul, Oct | D048 |
| Chloride [as Cl] | monthly maximum | report only (mg/L) | May, Jul, Oct | D048 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | May, Jul, Oct | D048 |
| Fluoride, total [as F] | monthly maximum | report only (mg/L) | May, Jul, Oct | D048 |
| Boron, total [as B] | monthly maximum | report only (mg/L) | May, Jul, Oct | D048 |
| Iron, total [as Fe] | monthly maximum | report only (mg/L) | May, Jul, Oct | D048 |
| Iron, dissolved [as Fe] | monthly average | ≤ 1 mg/L | May, Jul, Oct | D048 |
| Iron, dissolved [as Fe] | monthly maximum | ≤ 2 mg/L | May, Jul, Oct | D048 |
| Manganese, total [as Mn] | monthly maximum | report only (mg/L) | May, Jul, Oct | D048 |
| Molybdenum, total [as Mo] | monthly maximum | report only (ug/L) | May, Jul, Oct | D048 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | May, Jul, Oct | D048 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | May, Jul, Oct | D048 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | May, Jul, Oct | D048 |
| Sodium, % total cations | monthly maximum | report only (%) | May, Jul, Oct | D048 |
| Solids, total dissolved | monthly maximum | report only (mg/L) | May, Jul, Oct | D048 |
| Solids, total suspended | monthly maximum | ≤ 417 lb/d | Apr–Sep | D085 |
| pH | minimum | report only (SU) | all year | D092 |
| pH | annual maximum | report only (SU) | all year | D092 |
| Solids, total suspended | annual average | report only (mg/L) | all year | D092 |
| Arsenic, total [as As] | annual average | report only (mg/L) | all year | D092 |
| Cadmium, total [as Cd] | annual average | report only (mg/L) | all year | D092 |
| Copper, total [as Cu] | annual average | report only (mg/L) | all year | D092 |
| Iron, total [as Fe] | annual average | report only (mg/L) | all year | D092 |
| Lead, total [as Pb] | annual average | report only (mg/L) | all year | D092 |
| Nickel, total [as Ni] | annual average | report only (mg/L) | all year | D092 |
| Silver, total [as Ag] | annual average | report only (mg/L) | all year | D092 |
| Zinc, total [as Zn] | annual average | report only (mg/L) | all year | D092 |
| Antimony, total [as Sb] | annual average | report only (mg/L) | all year | D092 |
| Selenium, total [as Se] | annual average | report only (mg/L) | all year | D092 |
| Specific conductance | monthly maximum | report only (umho/cm) | Jan, Mar, May, Jul, Sep, Nov | S064 |
| pH | monthly minimum | report only (SU) | Jan, Mar, May, Jul, Sep, Nov | S064 |
| pH | monthly maximum | report only (SU) | Jan, Mar, May, Jul, Sep, Nov | S064 |
| Bicarbonate ion- [as HCO3] | monthly maximum | report only (mg/L) | Jan, Mar, May, Jul, Sep, Nov | S064 |
| Nitrite + Nitrate total [as N] | monthly maximum | report only (mg/L) | Jan, Mar, May, Jul, Sep, Nov | S064 |
| Calcium, total [as Ca] | monthly maximum | report only (mg/L) | Jan, Mar, May, Jul, Sep, Nov | S064 |
| Magnesium, total [as Mg] | monthly maximum | report only (mg/L) | Jan, Mar, May, Jul, Sep, Nov | S064 |
| Sodium, total [as Na] | monthly maximum | report only (mg/L) | Jan, Mar, May, Jul, Sep, Nov | S064 |
| Potassium, total [as K] | monthly maximum | report only (mg/L) | Jan, Mar, May, Jul, Sep, Nov | S064 |
| Chloride [as Cl] | monthly maximum | report only (mg/L) | Jan, Mar, May, Jul, Sep, Nov | S064 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | Jan, Mar, May, Jul, Sep, Nov | S064 |
| Fluoride, total [as F] | monthly maximum | report only (mg/L) | Jan, Mar, May, Jul, Sep, Nov | S064 |
| Iron, total [as Fe] | monthly maximum | report only (mg/L) | Jan, Mar, May, Jul, Sep, Nov | S064 |
| Manganese, total [as Mn] | monthly maximum | report only (mg/L) | Jan, Mar, May, Jul, Sep, Nov | S064 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | monthly maximum | report only (mg/L) | Jan, Mar, May, Jul, Sep, Nov | S064 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Mar, May, Jul, Sep, Nov | S064 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | Jan, Mar, May, Jul, Sep, Nov | S064 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | Jan, Mar, May, Jul, Sep, Nov | S064 |
| Solids, total dissolved | monthly maximum | report only (mg/L) | Jan, Mar, May, Jul, Sep, Nov | S064 |
| Precipitation, total defined period/in | monthly total | report only (in) | all year | S081 |
| Evaporation, Accumulated | monthly total | report only (in) | all year | S081 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | S081 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | S081 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | S081 |
| Stream flow, instantaneous | instantaneous maximum | report only (cfs) | Apr, Jul, Sep, Nov | W052 |
| Turbidity | monthly maximum | report only (NTU) | Apr, Jul, Sep, Nov | W052 |
| Redox [oxidation reduction potential] | monthly maximum | report only (mv) | Apr, Jul, Sep, Nov | W052 |
| Specific conductance | monthly maximum | report only (umho/cm) | Apr, Jul, Sep, Nov | W052 |
| pH | monthly maximum | report only (SU) | Apr, Jul, Sep, Nov | W052 |
| Alkalinity, total [as CaCO3] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W052 |
| Nitrogen, nitrate total [as N] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W052 |
| Hardness, total [as CaCO3] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W052 |
| Calcium, total [as Ca] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W052 |
| Magnesium, total [as Mg] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W052 |
| Sodium, total [as Na] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W052 |
| Potassium, total [as K] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W052 |
| Chloride [as Cl] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W052 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W052 |
| Asbestos | annual maximum | report only (MF/L) | Apr | W052 |
| Fluoride, total [as F] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W052 |
| Asbestos, Chrysotile | annual maximum | report only (MF/L) | Apr | W052 |
| Asbestos, total amphibole | annual maximum | report only (MF/L) | Apr | W052 |
| Fibers, ambiguous asbestos | annual maximum | report only (MF/L) | Apr | W052 |
| Fibers, non-amphibole, non-chrysotile asbestos | annual maximum | report only (MF/L) | Apr | W052 |
| Iron, total [as Fe] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W052 |
| Manganese, total [as Mn] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W052 |
| Solids, total dissolved | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W052 |
| Stream flow, instantaneous | instantaneous maximum | report only (cfs) | Apr, Jul, Sep, Nov | W070 |
| Turbidity | monthly maximum | report only (NTU) | Apr, Jul, Sep, Nov | W070 |
| Redox [oxidation reduction potential] | monthly maximum | report only (mv) | Apr, Jul, Sep, Nov | W070 |
| Specific conductance | monthly maximum | report only (umho/cm) | Apr, Jul, Sep, Nov | W070 |
| pH | monthly maximum | report only (SU) | Apr, Jul, Sep, Nov | W070 |
| Alkalinity, total [as CaCO3] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W070 |
| Nitrogen, nitrate total [as N] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W070 |
| Hardness, total [as CaCO3] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W070 |
| Calcium, total [as Ca] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W070 |
| Magnesium, total [as Mg] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W070 |
| Sodium, total [as Na] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W070 |
| Potassium, total [as K] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W070 |
| Chloride [as Cl] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W070 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W070 |
| Asbestos | annual maximum | report only (MF/L) | Apr | W070 |
| Fluoride, total [as F] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W070 |
| Asbestos, Chrysotile | annual maximum | report only (MF/L) | Apr | W070 |
| Asbestos, total amphibole | annual maximum | report only (MF/L) | Apr | W070 |
| Fibers, ambiguous asbestos | annual maximum | report only (MF/L) | Apr | W070 |
| Fibers, non-amphibole, non-chrysotile asbestos | annual maximum | report only (MF/L) | Apr | W070 |
| Iron, total [as Fe] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W070 |
| Manganese, total [as Mn] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W070 |
| Solids, total dissolved | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W070 |
| Stream flow, instantaneous | instantaneous maximum | report only (cfs) | Apr, Jul, Sep, Nov | W071 |
| Turbidity | monthly maximum | report only (NTU) | Apr, Jul, Sep, Nov | W071 |
| Redox [oxidation reduction potential] | monthly maximum | report only (mv) | Apr, Jul, Sep, Nov | W071 |
| Specific conductance | monthly maximum | report only (umho/cm) | Apr, Jul, Sep, Nov | W071 |
| pH | instantaneous minimum | report only (SU) | Apr, Jul, Sep, Nov | W071 |
| pH | instantaneous maximum | report only (SU) | Apr, Jul, Sep, Nov | W071 |
| Alkalinity, total [as CaCO3] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W071 |
| Nitrogen, nitrate total [as N] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W071 |
| Hardness, total [as CaCO3] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W071 |
| Calcium, total [as Ca] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W071 |
| Magnesium, total [as Mg] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W071 |
| Sodium, total [as Na] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W071 |
| Potassium, total [as K] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W071 |
| Chloride [as Cl] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W071 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W071 |
| Asbestos | annual maximum | report only (MF/L) | Apr | W071 |
| Fluoride, total [as F] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W071 |
| Asbestos, Chrysotile | annual maximum | report only (MF/L) | Apr | W071 |
| Asbestos, total amphibole | annual maximum | report only (MF/L) | Apr | W071 |
| Fibers, ambiguous asbestos | annual maximum | report only (MF/L) | Apr | W071 |
| Fibers, non-amphibole, non-chrysotile asbestos | annual maximum | report only (MF/L) | Apr | W071 |
| Iron, total [as Fe] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W071 |
| Manganese, total [as Mn] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W071 |
| Sodium, % total cations | monthly maximum | report only (%) | Apr, Jul, Sep, Nov | W071 |
| Solids, total dissolved | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W071 |
| Stream flow, instantaneous | instantaneous maximum | report only (cfs) | Apr, Jul, Sep, Nov | W072 |
| Turbidity | monthly maximum | report only (NTU) | Apr, Jul, Sep, Nov | W072 |
| Redox [oxidation reduction potential] | monthly maximum | report only (mv) | Apr, Jul, Sep, Nov | W072 |
| Specific conductance | monthly maximum | report only (umho/cm) | Apr, Jul, Sep, Nov | W072 |
| pH | instantaneous minimum | report only (SU) | Apr, Jul, Sep, Nov | W072 |
| pH | instantaneous maximum | report only (SU) | Apr, Jul, Sep, Nov | W072 |
| Alkalinity, total [as CaCO3] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W072 |
| Nitrogen, nitrate total [as N] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W072 |
| Hardness, total [as CaCO3] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W072 |
| Calcium, total [as Ca] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W072 |
| Magnesium, total [as Mg] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W072 |
| Sodium, total [as Na] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W072 |
| Potassium, total [as K] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W072 |
| Chloride [as Cl] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W072 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W072 |
| Asbestos | annual maximum | report only (MF/L) | Apr | W072 |
| Fluoride, total [as F] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W072 |
| Asbestos, Chrysotile | annual maximum | report only (MF/L) | Apr | W072 |
| Asbestos, total amphibole | annual maximum | report only (MF/L) | Apr | W072 |
| Fibers, ambiguous asbestos | annual maximum | report only (MF/L) | Apr | W072 |
| Fibers, non-amphibole, non-chrysotile asbestos | annual maximum | report only (MF/L) | Apr | W072 |
| Iron, total [as Fe] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W072 |
| Manganese, total [as Mn] | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W072 |
| Solids, total dissolved | monthly maximum | report only (mg/L) | Apr, Jul, Sep, Nov | W072 |
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | W073 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | W073 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | W073 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | W073 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | W073 |
Cited limits by parameter: Minnesota's rules and the federal ones.
Same industry: the 7 Metal Mining permits in Minnesota.
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Your permit document is the final word. As JSON: /api/v1/permits/MN0055301 · MCP: https://passage-data.com/mcp