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Iron And Steel Forgings, Forest Lake, Minnesota. NPDES permit MN0069051, in force until Oct 31, 2029. Last 12 months: over a limit 5 times (last March 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | pH, instantaneous maximum | 9.4 | ≤ 9 SU | — |
| December 2025 | Solids, total suspended, monthly average | 112 | ≤ 30 mg/L | 273% |
| January 2026 | pH, instantaneous minimum | 0 | ≥ 6 SU | — |
| February 2026 | pH, instantaneous minimum | 0 | ≥ 6 SU | — |
| March 2026 | Solids, total suspended, monthly average | 60 | ≤ 30 mg/L | 100% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | instantaneous minimum | ≥ 6 SU | all year | D001 |
| pH | instantaneous maximum | ≤ 9 SU | all year | D001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | D001 |
| Nitrogen, total [as N] | annual average | report only (mg/L) | all year | D001 |
| Nitrogen, Kjeldahl, total [as N] | annual average | report only (mg/L) | all year | D001 |
| Nitrite + Nitrate total [as N] | annual average | report only (mg/L) | all year | D001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | D001 |
| Phosphorus, total [as P] | annual total | ≤ 4.97 kg/yr | all year | D001 |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | all year | D001 |
| Copper, total [as Cu] | annual average | report only (ug/L) | all year | D001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D001 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | D001 |
| Solids, total suspended | annual average | report only (mg/L) | Dec | D002 |
| Iron, total [as Fe] | annual average | report only (mg/L) | Dec | D002 |
| Zinc, total [as Zn] | annual average | report only (mg/L) | Dec | D002 |
| Aluminum, total [as Al] | annual average | report only (mg/L) | Dec | 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/MN0069051 · MCP: https://passage-data.com/mcp