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Blast Furnaces And Steel Mills, Toledo, Ohio. NPDES permit OH0146633, in force until Aug 31, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | all year | 001 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 001 |
| pH | daily minimum | ≥ 6.5 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 29 kg/d | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 61 kg/d | all year | 001 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | ≤ 10 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year | 001 |
| Phosphorus, total [as P] | daily maximum | ≤ 1.5 mg/L | all year | 001 |
| Iron, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Oxidants, total residual | daily maximum | ≤ .0048 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 low level | monthly average | report only (ng/L) | all year | 001 |
| Mercury, total low level | daily maximum | report only (ng/L) | all year | 001 |
| Toxicity [acute], Ceriodaphnia dubia | monthly average | report only (tox acute) | Jun, Dec | 001 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | report only (tox acute) | Jun, Dec | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | monthly average | report only (tox acute) | Jun, Dec | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | daily maximum | report only (tox acute) | Jun, Dec | 001 |
| Solids, total dissolved- 180 deg. C | monthly average | report only (mg/L) | all year | 001 |
| Solids, total dissolved- 180 deg. C | daily maximum | report only (mg/L) | all year | 001 |
| pH | daily minimum | report only (SU) | all year | 002 |
| pH | daily maximum | report only (SU) | all year | 002 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 002 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 002 |
| Oil and grease, hexane extr method | monthly average | report only (mg/L) | all year | 002 |
| Oil and grease, hexane extr method | 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 |
| pH | daily minimum | report only (SU) | all year | 003 |
| pH | daily maximum | report only (SU) | all year | 003 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 003 |
| Oil and grease, hexane extr method | monthly average | report only (mg/L) | all year | 003 |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | all year | 003 |
| Zinc, total recoverable | monthly average | report only (ug/L) | all year | 003 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Mercury, total low level | monthly average | report only (ng/L) | all year | 800 |
| Mercury, total low level | daily maximum | report only (ng/L) | all year | 800 |
| %Effect Static Renewal 48Hr Acute Ceriodaphnia dubia | monthly average | report only (%) | Jun, Dec | 801 |
| %Effect Static Renewal 48Hr Acute Ceriodaphnia dubia | daily maximum | report only (%) | Jun, Dec | 801 |
| %Effect Static Renewal 96Hr Acute Pimephales promelas | monthly average | report only (%) | Jun, Dec | 801 |
| %Effect Static Renewal 96Hr Acute Pimephales promelas | daily maximum | report only (%) | Jun, Dec | 801 |
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/OH0146633 · MCP: https://passage-data.com/mcp