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Gray And Ductile Iron Foundries, Rockford, Illinois. NPDES permit IL0068284, in force until Sep 30, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | monthly maximum | report only (deg F) | all year | 001 |
| pH | monthly minimum | ≥ 6 SU | all year | 001 |
| pH | monthly maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | quarterly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | quarterly maximum | report only (mg/L) | all year | 001 |
| Iron, total [as Fe] | quarterly average | report only (mg/L) | all year | 001 |
| Iron, total [as Fe] | quarterly maximum | report only (mg/L) | all year | 001 |
| Iron, dissolved [as Fe] | quarterly average | report only (mg/L) | all year | 001 |
| Iron, dissolved [as Fe] | quarterly maximum | report only (mg/L) | all year | 001 |
| Lead, total [as Pb] | quarterly average | report only (mg/L) | all year | 001 |
| Lead, total [as Pb] | quarterly maximum | report only (mg/L) | all year | 001 |
| Manganese, total [as Mn] | quarterly average | report only (mg/L) | all year | 001 |
| Manganese, total [as Mn] | quarterly maximum | report only (mg/L) | all year | 001 |
| Nickel, total [as Ni] | semi-annual average | report only (mg/L) | all year | 001 |
| Nickel, total [as Ni] | semi-annual maximum | report only (mg/L) | all year | 001 |
| Zinc, total [as Zn] | quarterly average | report only (mg/L) | all year | 001 |
| Zinc, total [as Zn] | quarterly maximum | report only (mg/L) | all year | 001 |
| Oil and grease | 30-day average | ≤ 15 mg/L | all year | 001 |
| Oil and grease | daily maximum | ≤ 30 mg/L | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Mercury, total [as Hg] | semi-annual average | report only (ug/L) | all year | 001 |
| Mercury, total [as Hg] | semi-annual maximum | report only (ug/L) | all year | 001 |
| Temperature, water deg. fahrenheit | monthly maximum | report only (deg F) | all year | 002 |
| pH | monthly minimum | ≥ 6 SU | all year | 002 |
| pH | monthly maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | quarterly average | report only (mg/L) | all year | 002 |
| Solids, total suspended | quarterly maximum | report only (mg/L) | all year | 002 |
| Oil & Grease | 30-day average | ≤ 15 mg/L | all year | 002 |
| Oil & Grease | daily maximum | ≤ 30 mg/L | all year | 002 |
| Iron, total [as Fe] | quarterly average | report only (mg/L) | all year | 002 |
| Iron, total [as Fe] | quarterly maximum | report only (mg/L) | all year | 002 |
| Iron, dissolved [as Fe] | quarterly average | report only (mg/L) | all year | 002 |
| Iron, dissolved [as Fe] | quarterly maximum | report only (mg/L) | all year | 002 |
| Lead, total [as Pb] | quarterly average | report only (mg/L) | all year | 002 |
| Lead, total [as Pb] | quarterly maximum | report only (mg/L) | all year | 002 |
| Manganese, total [as Mn] | quarterly average | report only (mg/L) | all year | 002 |
| Manganese, total [as Mn] | quarterly maximum | report only (mg/L) | all year | 002 |
| Nickel, total [as Ni] | semi-annual average | report only (mg/L) | all year | 002 |
| Nickel, total [as Ni] | semi-annual maximum | report only (mg/L) | all year | 002 |
| Zinc, total [as Zn] | quarterly average | report only (mg/L) | all year | 002 |
| Zinc, total [as Zn] | quarterly maximum | report only (mg/L) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Mercury, total [as Hg] | semi-annual average | report only (ug/L) | all year | 002 |
| Mercury, total [as Hg] | semi-annual maximum | report only (ug/L) | all year | 002 |
| pH | semi-annual minimum | report only (SU) | all year | A01 |
| pH | semi-annual maximum | report only (SU) | all year | A01 |
| Solids, total suspended | semi-annual average | report only (mg/L) | all year | A01 |
| Solids, total suspended | semi-annual maximum | report only (mg/L) | all year | A01 |
| Oil & Grease | semi-annual average | report only (mg/L) | all year | A01 |
| Oil & Grease | semi-annual maximum | report only (mg/L) | all year | A01 |
| Iron, total [as Fe] | semi-annual average | report only (mg/L) | all year | A01 |
| Iron, total [as Fe] | semi-annual maximum | report only (mg/L) | all year | A01 |
| Lead, total [as Pb] | semi-annual average | report only (mg/L) | all year | A01 |
| Lead, total [as Pb] | semi-annual maximum | report only (mg/L) | all year | A01 |
| Manganese, total [as Mn] | semi-annual average | report only (mg/L) | all year | A01 |
| Manganese, total [as Mn] | semi-annual maximum | report only (mg/L) | all year | A01 |
| Nickel, total [as Ni] | semi-annual average | report only (mg/L) | all year | A01 |
| Nickel, total [as Ni] | semi-annual maximum | report only (mg/L) | all year | A01 |
| Zinc, total [as Zn] | semi-annual average | report only (mg/L) | all year | A01 |
| Zinc, total [as Zn] | semi-annual maximum | report only (mg/L) | all year | A01 |
| Flow, in conduit or thru treatment plant | semi-annual average | report only (MGD) | all year | A01 |
| Flow, in conduit or thru treatment plant | semi-annual maximum | report only (MGD) | all year | A01 |
| Mercury, total [as Hg] | semi-annual average | report only (ug/L) | all year | A01 |
| Mercury, total [as Hg] | semi-annual maximum | report only (ug/L) | all year | A01 |
| pH | semi-annual minimum | report only (SU) | all year | A02 |
| pH | semi-annual maximum | report only (SU) | all year | A02 |
| Solids, total suspended | semi-annual average | report only (mg/L) | all year | A02 |
| Solids, total suspended | semi-annual maximum | report only (mg/L) | all year | A02 |
| Oil & Grease | semi-annual average | report only (mg/L) | all year | A02 |
| Oil & Grease | semi-annual maximum | report only (mg/L) | all year | A02 |
| Iron, total [as Fe] | semi-annual average | report only (mg/L) | all year | A02 |
| Iron, total [as Fe] | semi-annual maximum | report only (mg/L) | all year | A02 |
| Lead, total [as Pb] | semi-annual average | report only (mg/L) | all year | A02 |
| Lead, total [as Pb] | semi-annual maximum | report only (mg/L) | all year | A02 |
| Manganese, total [as Mn] | semi-annual average | report only (mg/L) | all year | A02 |
| Manganese, total [as Mn] | semi-annual maximum | report only (mg/L) | all year | A02 |
| Nickel, total [as Ni] | semi-annual average | report only (mg/L) | all year | A02 |
| Nickel, total [as Ni] | semi-annual maximum | report only (mg/L) | all year | A02 |
| Zinc, total [as Zn] | semi-annual average | report only (mg/L) | all year | A02 |
| Zinc, total [as Zn] | semi-annual maximum | report only (mg/L) | all year | A02 |
| Flow, in conduit or thru treatment plant | semi-annual average | report only (MGD) | all year | A02 |
| Flow, in conduit or thru treatment plant | semi-annual maximum | report only (MGD) | all year | A02 |
| Mercury, total [as Hg] | semi-annual average | report only (ug/L) | all year | A02 |
| Mercury, total [as Hg] | semi-annual maximum | report only (ug/L) | all year | A02 |
Cited limits by parameter: Illinois's rules and the federal ones.
Same industry: the 22 Primary Metal Industries permits in Illinois.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/IL0068284 · MCP: https://passage-data.com/mcp