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Gray And Ductile Iron Foundries, Akron, Ohio. NPDES permit OH0137057, in force until Oct 31, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Flow rate | monthly average | report only (gal/d) | all year | 001 |
| Flow rate | daily maximum | report only (gal/d) | all year | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | Mar, Jun, Sep, Dec | 001 |
| pH | daily minimum | ≥ 6.5 SU | Mar, Jun, Sep, Dec | 001 |
| pH | daily maximum | ≤ 9 SU | Mar, Jun, Sep, Dec | 001 |
| Solids, total suspended | monthly average | ≤ 12 mg/L | Mar, Jun, Sep, Dec | 001 |
| Solids, total suspended | weekly maximum | ≤ 18 mg/L | Mar, Jun, Sep, Dec | 001 |
| Solids, total suspended | monthly average | ≤ .0682 kg/d | Mar, Jun, Sep, Dec | 001 |
| Solids, total suspended | weekly maximum | ≤ .103 kg/d | Mar, Jun, Sep, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3 mg/L | Mar, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ 4.5 mg/L | Mar, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .0171 kg/d | Mar, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ .0256 kg/d | Mar, Dec | 001 |
| Turbidity [severity] | monthly average | report only (severity) | all year | 001 |
| Turbidity [severity] | daily maximum | report only (severity) | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | Mar, Jun, Sep, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly maximum | ≤ 15 mg/L | Mar, Jun, Sep, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ .0568 kg/d | Mar, Jun, Sep, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly maximum | ≤ .0852 kg/d | Mar, Jun, Sep, Dec | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 002 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 002 |
| Zinc, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Aluminum, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Copper, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Sludge waste from secondary clarifiers | monthly average | report only (gal) | Dec | 588 |
| Sludge waste from secondary clarifiers | daily maximum | report only (gal) | Dec | 588 |
Cited limits by parameter: Ohio's rules and the federal ones.
Same industry: the 56 Primary Metal Industries permits in Ohio.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/OH0137057 · MCP: https://passage-data.com/mcp