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Iron Ores, Keewatin, Minnesota. NPDES permit MN0031879 expired Oct 31, 2016; its limits still apply. Last 12 months: no values over a limit, 30 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Specific conductance | quarterly maximum | report only (umho/cm) | Mar, Jun, Sep, Dec | 013 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 013 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 013 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | Mar, Jun, Sep, Dec | 013 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | Mar, Jun, Sep, Dec | 013 |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | all year | 013 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | all year | 013 |
| Iron, dissolved [as Fe] | monthly average | ≤ 1 mg/L | all year | 013 |
| Iron, dissolved [as Fe] | daily maximum | ≤ 2 mg/L | all year | 013 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 013 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 013 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | 013 |
| Solids, total dissolved | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 013 |
| Mercury, total [as Hg] | single sample | report only (ng/L) | Mar, Jun, Sep, Dec | 013 |
| pH | instantaneous minimum | ≥ 6 SU | Mar, Jun, Sep, Dec | 040 |
| pH | instantaneous maximum | ≤ 9 SU | Mar, Jun, Sep, Dec | 040 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | Mar, Jun, Sep, Dec | 040 |
| Flow, in conduit or thru treatment plant | quarterly average | report only (MGD) | Mar, Jun, Sep, Dec | 040 |
| Flow, in conduit or thru treatment plant | quarterly total | report only (Mgal/mo) | Mar, Jun, Sep, Dec | 040 |
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | Mar–Oct | 050 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | Mar–Oct | 050 |
| Specific conductance | single sample | report only (umho/cm) | Mar, Jun, Sep, Dec | 050 |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | 050 |
| pH | instantaneous maximum | ≤ 8.5 SU | all year | 050 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 050 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 050 |
| Oil and grease, hexane extr method | quarterly average | ≤ .5 mg/L | Mar, Jun, Sep, Dec | 050 |
| Oil and grease, hexane extr method | daily maximum | ≤ 5 mg/L | Mar, Jun, Sep, Dec | 050 |
| Nitrogen, ammonia, tot unionized [as N] | monthly average | ≤ .04 mg/L | Mar–Oct | 050 |
| Nitrogen, ammonia, tot unionized [as N] | daily maximum | report only (mg/L) | Mar–Oct | 050 |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | all year | 050 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | all year | 050 |
| Iron, dissolved [as Fe] | monthly average | ≤ 1 mg/L | all year | 050 |
| Iron, dissolved [as Fe] | daily maximum | ≤ 2 mg/L | all year | 050 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 050 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | 050 |
| Mercury, total [as Hg] | single sample | report only (ng/L) | Mar, Jun, Sep, Dec | 050 |
| Specific conductance | single sample | report only (umho/cm) | Mar, Jun, Sep, Dec | 080 |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | 080 |
| pH | instantaneous maximum | ≤ 8.5 SU | all year | 080 |
| Solids, total suspended | quarterly average | ≤ 20 mg/L | Mar, Jun, Sep, Dec | 080 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | Mar, Jun, Sep, Dec | 080 |
| Oil and grease, hexane extr method | quarterly average | ≤ .5 mg/L | Mar, Jun, Sep, Dec | 080 |
| Oil and grease, hexane extr method | daily maximum | ≤ 5 mg/L | Mar, Jun, Sep, Dec | 080 |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | all year | 080 |
| Sulfate, total [as SO4] | annual maximum | report only (mg/L) | all year | 080 |
| Iron, dissolved [as Fe] | monthly average | ≤ 1 mg/L | all year | 080 |
| Iron, dissolved [as Fe] | daily maximum | ≤ 2 mg/L | all year | 080 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 080 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | 080 |
| Mercury, total [as Hg] | single sample | report only (ng/L) | Mar, Jun, Sep, Dec | 080 |
Cited limits by parameter: Minnesota's rules and the federal ones.
Same industry: the 7 Metal Mining permits in Minnesota.
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