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Blast Furnaces And Steel Mills, major discharger, Calvert, Alabama. NPDES permit AL0079901, in force until Mar 31, 2027. 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 | ≤ 115 deg F | all year | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 2 mg/L | all year | 001 |
| Oxygen, dissolved [DO] | monthly average | report only (mg/L) | all year | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 001 |
| Solids, total suspended | monthly average | ≤ 1222.2 lb/d | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 3048.1 lb/d | all year | 001 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 001 |
| Oil & Grease | monthly average | ≤ 412.4 lb/d | all year | 001 |
| Oil & Grease | daily maximum | ≤ 1045.2 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 16 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 24 mg/L | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | ≤ 46 mg/L | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 69 mg/L | all year | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | Apr–Oct | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | Apr–Oct | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Apr–Oct | 001 |
| Arsenic, total recoverable | monthly average | report only (mg/L) | all year | 001 |
| Arsenic, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Chromium, hexavalent [as Cr] | monthly average | ≤ .15 lb/d | all year | 001 |
| Chromium, hexavalent [as Cr] | daily maximum | ≤ .451 lb/d | all year | 001 |
| Chromium, total [as Cr] | monthly average | ≤ 2.54 lb/d | all year | 001 |
| Chromium, total [as Cr] | daily maximum | ≤ 6.36 lb/d | all year | 001 |
| Lead, total [as Pb] | monthly average | ≤ 2.71 lb/d | all year | 001 |
| Lead, total [as Pb] | daily maximum | ≤ 8.14 lb/d | all year | 001 |
| Nickel, total [as Ni] | monthly average | ≤ 1.91 lb/d | all year | 001 |
| Nickel, total [as Ni] | daily maximum | ≤ 5.72 lb/d | all year | 001 |
| Nickel, total recoverable | monthly average | report only (mg/L) | all year | 001 |
| Nickel, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Zinc, total [as Zn] | monthly average | ≤ 3.53 lb/d | all year | 001 |
| Zinc, total [as Zn] | daily maximum | ≤ 10.72 lb/d | all year | 001 |
| Zinc, total recoverable | monthly average | report only (mg/L) | all year | 001 |
| Zinc, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Lead, total recoverable | monthly average | report only (mg/L) | all year | 001 |
| Lead, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Chromium, total recoverable | monthly average | report only (mg/L) | all year | 001 |
| Chromium, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Copper, total recoverable | monthly average | report only (mg/L) | all year | 001 |
| Copper, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Antimony, total recoverable | monthly average | report only (mg/L) | all year | 001 |
| Antimony, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Naphthalene | monthly average | ≤ .09 lb/d | all year | 001 |
| Naphthalene | daily maximum | ≤ .179 lb/d | all year | 001 |
| Phenols | monthly average | report only (mg/L) | all year | 001 |
| Phenols | daily maximum | report only (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 | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | monthly average | ≤ .1 mg/L | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .17 mg/L | all year | 001 |
| Cyanide, free available | monthly average | report only (mg/L) | all year | 001 |
| Cyanide, free available | daily maximum | report only (mg/L) | all year | 001 |
| Toxicity [acute], Ceriodaphnia dubia | single sample | ≤ 0 pass=0;fail=1 | all year | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | single sample | ≤ 0 pass=0;fail=1 | all year | 001 |
| Solids, total dissolved [TDS] | monthly average | report only (mg/L) | all year | 001 |
| Solids, total dissolved [TDS] | daily maximum | report only (mg/L) | all year | 001 |
| Mercury, total recoverable | monthly average | report only (mg/L) | all year | 001 |
| Mercury, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 38 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 57 mg/L | all year | 001 |
| Tetrachloroethylene | monthly average | ≤ .134 lb/d | all year | 001 |
| Tetrachloroethylene | daily maximum | ≤ .269 lb/d | all year | 001 |
| pH | daily minimum | report only (SU) | all year | 005 |
| pH | daily maximum | report only (SU) | all year | 005 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 005 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 005 |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | all year | 005 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | 005 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 005 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 005 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 005 |
| Mercury, total [as Hg] | daily maximum | report only (mg/L) | all year | 005 |
| Chemical Oxygen Demand [COD] | daily maximum | report only (mg/L) | all year | 005 |
| pH | daily minimum | report only (SU) | all year | 008 |
| pH | daily maximum | report only (SU) | all year | 008 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 008 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 008 |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | all year | 008 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | 008 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 008 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 008 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 008 |
| Chemical Oxygen Demand [COD] | daily maximum | report only (mg/L) | all year | 008 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 01D |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 01D |
| Chromium, hexavalent tot recoverable | monthly average | ≤ 1 mg/L | all year | 01D |
| Chromium, hexavalent tot recoverable | daily maximum | ≤ 2 mg/L | all year | 01D |
Cited limits by parameter: Alabama's rules and the federal ones.
Same industry: the 23 Primary Metal Industries permits in Alabama.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/AL0079901 · MCP: https://passage-data.com/mcp