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Steel Foundries, Duluth, Minnesota. NPDES permit MN0053830 expired Aug 31, 2021; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | quarterly maximum | ≤ 90 deg F | all year | D002 |
| pH | quarterly minimum | ≥ 6 SU | all year | D002 |
| pH | quarterly maximum | ≤ 9 SU | all year | D002 |
| Nitrogen, total [as N] | quarterly maximum | report only (mg/L) | all year | D002 |
| Nitrogen, Kjeldahl, total [as N] | quarterly maximum | report only (mg/L) | all year | D002 |
| Nitrite + Nitrate total [as N] | quarterly maximum | report only (mg/L) | all year | D002 |
| Phosphorus, total [as P] | quarterly maximum | report only (mg/L) | all year | D002 |
| Sulfate, total [as SO4] | quarterly maximum | report only (mg/L) | all year | D002 |
| Flow, in conduit or thru treatment plant | quarterly average | report only (MGD) | all year | D002 |
| Flow, in conduit or thru treatment plant | quarterly total | report only (Mgal/mo) | all year | D002 |
| Chlorine, total residual | quarterly maximum | ≤ .04 mg/L | all year | D002 |
| Solids, total suspended | annual average | report only (mg/L) | all year | D003 |
| Copper, total [as Cu] | annual average | report only (mg/L) | all year | D003 |
| Iron, total [as Fe] | annual average | report only (mg/L) | all year | D003 |
| Zinc, total [as Zn] | annual average | report only (mg/L) | all year | D003 |
| Aluminum, total [as Al] | annual average | report only (mg/L) | all year | D003 |
| Solids, total suspended | annual average | report only (mg/L) | all year | D004 |
| Copper, total [as Cu] | annual average | report only (mg/L) | all year | D004 |
| Iron, total [as Fe] | annual average | report only (mg/L) | all year | D004 |
| Zinc, total [as Zn] | annual average | report only (mg/L) | all year | D004 |
| Aluminum, total [as Al] | annual average | report only (mg/L) | all year | D004 |
Cited limits by parameter: Minnesota's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/MN0053830 · MCP: https://passage-data.com/mcp