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Iron Ores, Keewatin, Minnesota. NPDES permit MN0055948 expired Oct 31, 2016; its limits still apply. Last 12 months: no values over a limit, 42 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Specific conductance | monthly average | report only (mmho/cm) | all year | 010 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 010 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 010 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 010 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 010 |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | all year | 010 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | all year | 010 |
| Iron, dissolved [as Fe] | monthly average | ≤ 1 mg/L | all year | 010 |
| Iron, dissolved [as Fe] | daily maximum | ≤ 2 mg/L | all year | 010 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 010 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | 010 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | 010 |
| Mercury, total [as Hg] | single sample | report only (ng/L) | all year | 010 |
| Specific conductance | monthly average | report only (mmho/cm) | all year | 015 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 015 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 015 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 015 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 015 |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | all year | 015 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | all year | 015 |
| Iron, dissolved [as Fe] | monthly average | ≤ 1 mg/L | all year | 015 |
| Iron, dissolved [as Fe] | daily maximum | ≤ 2 mg/L | all year | 015 |
| Selenium, total [as Se] | monthly average | report only (ug/L) | all year | 015 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 015 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | 015 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | 015 |
| Mercury, total [as Hg] | single sample | report only (ng/L) | Mar, Jun, Sep, Dec | 015 |
| Precipitation, total defined period/in | monthly total | report only (in) | all year | 018 |
| Evaporation, Accumulated | monthly total | report only (in) | all year | 018 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | 018 |
| Specific conductance | monthly average | report only (mmho/cm) | all year | 019 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 019 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 019 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 019 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 019 |
| Nitrogen, ammonia total [as N] | single sample | report only (mg/L) | Dec | 019 |
| Nitrogen, Kjeldahl, total [as N] | single sample | report only (mg/L) | Dec | 019 |
| Nitrite + Nitrate total [as N] | single sample | report only (mg/L) | Dec | 019 |
| Chloride [as Cl] | monthly maximum | report only (mg/L) | all year | 019 |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | all year | 019 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | all year | 019 |
| Iron, dissolved [as Fe] | monthly average | ≤ 1 mg/L | all year | 019 |
| Iron, dissolved [as Fe] | daily maximum | ≤ 2 mg/L | all year | 019 |
| Selenium, total [as Se] | monthly average | report only (mg/L) | all year | 019 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 019 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | 019 |
| Solids, total dissolved | single sample | report only (mg/L) | Dec | 019 |
| Mercury, total [as Hg] | single sample | report only (ng/L) | Mar, Jun, Sep, Dec | 019 |
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/MN0055948 · MCP: https://passage-data.com/mcp