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Gray And Ductile Iron Foundries, Lake City, Minnesota. NPDES permit MN0001147, in force until Dec 31, 2027. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | daily maximum | ≤ 86 deg F | Mar, Jun, Sep, Dec | D001 |
| pH | instantaneous minimum | ≥ 6 SU | Mar, Jun, Sep, Dec | D001 |
| pH | instantaneous maximum | ≤ 9 SU | Mar, Jun, Sep, Dec | D001 |
| Solids, total suspended | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | D001 |
| Solids, total suspended | quarterly maximum | ≤ 30 mg/L | Mar, Jun, Sep, Dec | D001 |
| Solids, total suspended | daily maximum | ≤ 31.2 kg/d | Mar, Jun, Sep, Dec | D001 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | Mar, Jun, Sep, Dec | D001 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10.4 kg/d | Mar, Jun, Sep, Dec | D001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Mar, Sep | D001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | Mar, Sep | D001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | Mar, Sep | D001 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year | D001 |
| Phosphorus, total [as P] | annual total | ≤ 179 kg/yr | all year | D001 |
| Sulfate, total [as SO4] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D001 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | D001 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D001 |
| Chlorine, total residual | daily maximum | ≤ .038 mg/L | Mar, Jun, Sep, Dec | D001 |
| Solids, total suspended | annual average | report only (mg/L) | all year | D002 |
| Phosphorus, total [as P] | annual average | report only (mg/L) | all year | D002 |
| Copper, total [as Cu] | annual average | report only (mg/L) | all year | D002 |
| Iron, total [as Fe] | annual average | report only (mg/L) | all year | D002 |
| Zinc, total [as Zn] | annual average | report only (mg/L) | all year | D002 |
| Aluminum, total [as Al] | annual average | report only (mg/L) | all year | D002 |
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/MN0001147 · MCP: https://passage-data.com/mcp