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Gray And Ductile Iron Foundries, Meadville, Pennsylvania. NPDES permit PA0004251, in force until May 31, 2027. Last 12 months: no values over a limit, 26 required values missing, 2 of 26 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | instantaneous minimum | ≥ 6 SU | all year | 002 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 002 |
| Oil & Grease | semi-annual average | ≤ 15 mg/L | all year | 002 |
| Oil & Grease | instantaneous maximum | ≤ 30 mg/L | all year | 002 |
| Flow, in conduit or thru treatment plant | semi-annual average | report only (MGD) | all year | 002 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 003 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 003 |
| Oil & Grease | semi-annual average | ≤ 15 mg/L | all year | 003 |
| Oil & Grease | instantaneous maximum | ≤ 30 mg/L | all year | 003 |
| Flow, in conduit or thru treatment plant | semi-annual average | report only (MGD) | all year | 003 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 004 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 004 |
| Oil & Grease | semi-annual average | ≤ 15 mg/L | all year | 004 |
| Oil & Grease | instantaneous maximum | ≤ 30 mg/L | all year | 004 |
| Flow, in conduit or thru treatment plant | semi-annual average | report only (MGD) | all year | 004 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 102 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 102 |
| Oil & Grease | monthly average | ≤ 15 mg/L | all year | 102 |
| Oil & Grease | instantaneous maximum | ≤ 30 mg/L | all year | 102 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 102 |
| Nitrogen, ammonia total [as N] | instantaneous maximum | report only (mg/L) | all year | 102 |
| Chloride [as Cl] | monthly average | report only (mg/L) | all year | 102 |
| Chloride [as Cl] | instantaneous maximum | report only (mg/L) | all year | 102 |
| Nickel, total [as Ni] | monthly average | report only (mg/L) | all year | 102 |
| Nickel, total [as Ni] | instantaneous maximum | report only (mg/L) | all year | 102 |
| Zinc, total [as Zn] | monthly average | report only (mg/L) | all year | 102 |
| Zinc, total [as Zn] | instantaneous maximum | report only (mg/L) | all year | 102 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 102 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 103 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 103 |
| Oil & Grease | monthly average | ≤ 15 mg/L | all year | 103 |
| Oil & Grease | instantaneous maximum | ≤ 30 mg/L | all year | 103 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 103 |
| Nitrogen, ammonia total [as N] | instantaneous maximum | report only (mg/L) | all year | 103 |
| Chloride [as Cl] | monthly average | report only (mg/L) | all year | 103 |
| Chloride [as Cl] | instantaneous maximum | report only (mg/L) | all year | 103 |
| Nickel, total [as Ni] | monthly average | report only (mg/L) | all year | 103 |
| Nickel, total [as Ni] | instantaneous maximum | report only (mg/L) | all year | 103 |
| Zinc, total [as Zn] | monthly average | report only (mg/L) | all year | 103 |
| Zinc, total [as Zn] | instantaneous maximum | report only (mg/L) | all year | 103 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 103 |
Cited limits by parameter: Pennsylvania's rules and the federal ones.
Same industry: the 85 Primary Metal Industries permits in Pennsylvania.
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On EPA ECHO: Facility report · DMR history
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