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Primary Aluminum, major discharger, Rockdale, Texas. NPDES permit TX0000876 expired May 29, 2025; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | monthly minimum | ≥ 5 mg/L | all year | 001 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | daily average | ≤ 50 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 001 |
| Oil & Grease | daily average | ≤ 15 mg/L | all year | 001 |
| Oil & Grease | daily maximum | ≤ 20 mg/L | all year | 001 |
| Fluoride, total [as F] | daily average | ≤ 9 mg/L | all year | 001 |
| Fluoride, total [as F] | daily maximum | ≤ 14 mg/L | all year | 001 |
| Arsenic, total [as As] | daily average | report only (mg/L) | all year | 001 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | 001 |
| Beryllium, total [as Be] | daily average | report only (mg/L) | all year | 001 |
| Beryllium, total [as Be] | daily maximum | report only (mg/L) | all year | 001 |
| Copper, total [as Cu] | daily average | ≤ .039 mg/L | all year | 001 |
| Copper, total [as Cu] | daily maximum | ≤ .082 mg/L | all year | 001 |
| Iron, total [as Fe] | daily average | ≤ 1.3 mg/L | all year | 001 |
| Iron, total [as Fe] | daily maximum | ≤ 2.6 mg/L | all year | 001 |
| Nickel, total [as Ni] | daily average | ≤ .98 mg/L | all year | 001 |
| Nickel, total [as Ni] | daily maximum | ≤ 2 mg/L | all year | 001 |
| Silver, total [as Ag] | daily average | report only (mg/L) | all year | 001 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 001 |
| Antimony, total [as Sb] | daily average | ≤ .64 mg/L | all year | 001 |
| Antimony, total [as Sb] | daily maximum | ≤ 1.27 mg/L | all year | 001 |
| Aluminum, total [as Al] | daily average | ≤ .83 mg/L | all year | 001 |
| Aluminum, total [as Al] | daily maximum | ≤ 1.77 mg/L | all year | 001 |
| Selenium, total [as Se] | daily average | report only (mg/L) | all year | 001 |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .2 mg/L | all year | 001 |
| Solids, total dissolved | daily average | ≤ 1050 mg/L | all year | 001 |
| Solids, total dissolved | daily maximum | ≤ 1200 mg/L | all year | 001 |
| Mercury, total [as Hg] | daily average | report only (mg/L) | all year | 001 |
| Mercury, total [as Hg] | daily maximum | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | daily average | ≤ 20 mg/L | all year | 201 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 65 mg/L | all year | 201 |
| pH | minimum | ≥ 6 SU | all year | 201 |
| pH | maximum | ≤ 9 SU | all year | 201 |
| Solids, total suspended | daily average | ≤ 20 mg/L | all year | 201 |
| Solids, total suspended | daily maximum | ≤ 65 mg/L | all year | 201 |
| Flow, in conduit or thru treatment plant | daily average | ≤ .28 MGD | all year | 201 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ .5 MGD | all year | 201 |
| E. coli | daily average | ≤ 126 CFU/100mL | all year | 201 |
| E. coli | daily maximum | ≤ 394 CFU/100mL | all year | 201 |
| pH | minimum | ≥ 6 SU | all year | 401 |
| pH | maximum | ≤ 10 SU | all year | 401 |
| Solids, total suspended | daily average | report only (mg/L) | all year | 401 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 401 |
| Fluoride, total [as F] | daily average | report only (mg/L) | all year | 401 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 401 |
| Nickel, total [as Ni] | daily average | report only (mg/L) | all year | 401 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 401 |
| Antimony, total [as Sb] | daily average | report only (mg/L) | all year | 401 |
| Antimony, total [as Sb] | daily maximum | report only (mg/L) | all year | 401 |
| Aluminum, total [as Al] | daily average | report only (mg/L) | all year | 401 |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | all year | 401 |
| Flow [dry weather] | daily average | ≤ 10 MGD | all year | 401 |
| Flow [dry weather] | daily maximum | ≤ 20 MGD | all year | 401 |
| pH | minimum | ≥ 6 SU | all year | 501 |
| pH | maximum | ≤ 10 SU | all year | 501 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 501 |
| Copper, total [as Cu] | daily maximum | ≤ 1 mg/L | all year | 501 |
| Lead, total [as Pb] | daily maximum | ≤ 1 mg/L | all year | 501 |
| Flow [dry weather] | daily average | ≤ 25 MGD | all year | 501 |
| Flow [dry weather] | daily maximum | ≤ 30 MGD | all year | 501 |
| pH | minimum | ≥ 6 SU | all year | 601 |
| pH | maximum | ≤ 10 SU | all year | 601 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 601 |
| Copper, total [as Cu] | daily maximum | ≤ 1 mg/L | all year | 601 |
| Lead, total [as Pb] | daily maximum | ≤ 1 mg/L | all year | 601 |
| Flow [dry weather] | daily average | ≤ 3 MGD | all year | 601 |
| Flow [dry weather] | daily maximum | ≤ 6 MGD | all year | 601 |
| Whole effluent toxicity - retest #1 | 48-hour minimum | report only (pass=0;fail=1) | all year | TX1 |
| Whole effluent toxicity - retest #1 | monthly average minimum | report only (pass=0;fail=1) | all year | TX1 |
| Whole effluent toxicity - retest #2 | 48-hour minimum | report only (pass=0;fail=1) | all year | TX1 |
| Whole effluent toxicity - retest #2 | monthly average minimum | report only (pass=0;fail=1) | all year | TX1 |
| Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex | 48-hour minimum | report only (pass=0;fail=1) | all year | TX1 |
| Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex | monthly average minimum | report only (pass=0;fail=1) | all year | TX1 |
| LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas | 48-hour minimum | report only (pass=0;fail=1) | all year | TX1 |
| LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas | monthly average minimum | report only (pass=0;fail=1) | all year | TX1 |
| NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex | 48-hour minimum | report only (%) | all year | TX1 |
| NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex | monthly average minimum | report only (%) | all year | TX1 |
| NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas | 48-hour minimum | report only (%) | all year | TX1 |
| NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas | monthly average minimum | report only (%) | all year | TX1 |
| LOAEC Lethal Static Renewal 48HR Acute Daphnia pulex | 48-hour minimum | report only (%) | all year | TX1 |
| LOAEC Lethal Static Renewal 48HR Acute Daphnia pulex | monthly average minimum | report only (%) | all year | TX1 |
| LOAEC Lethal Survival Static Renewal 48Hr Acute Pimephales promelas | 48-hour minimum | report only (%) | all year | TX1 |
| LOAEC Lethal Survival Static Renewal 48Hr Acute Pimephales promelas | monthly average minimum | report only (%) | all year | TX1 |
| LC50 Pass/Fail Static 24Hr Acute D. Pulex | single sample | report only (pass=0;fail=1) | all year | TXA |
| LC50 Pass/Fail Static 24Hr Acute Pimephales promelas | single sample | report only (pass=0;fail=1) | all year | TXA |
Cited limits by parameter: Texas's rules and the federal ones.
Same industry: the 13 Primary Metal Industries permits in Texas.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/TX0000876 · MCP: https://passage-data.com/mcp