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Petroleum Refining, major discharger, Houston, Texas. NPDES permit TX0002976, in force until Mar 16, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | daily maximum | ≤ 120 deg F | all year | 001 |
| Oxygen demand, chem. [high level] [COD] | daily average | ≤ 10115 lb/d | all year | 001 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 19545 lb/d | all year | 001 |
| pH | minimum | ≥ 5 SU | all year | 001 |
| pH | maximum | ≤ 11 SU | all year | 001 |
| Solids, total suspended | daily average | ≤ 1518 lb/d | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 2850 lb/d | all year | 001 |
| Oil & Grease | daily average | ≤ 632 lb/d | all year | 001 |
| Oil & Grease | daily maximum | ≤ 1107 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | daily average | ≤ 186 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 279 lb/d | all year | 001 |
| Cyanide, free [as free] | daily average | ≤ .242 lb/d | all year | 001 |
| Cyanide, free [as free] | daily maximum | ≤ .509 lb/d | all year | 001 |
| Sulfide, total [as S] | daily average | ≤ 12.4 lb/d | all year | 001 |
| Sulfide, total [as S] | daily maximum | ≤ 26.7 lb/d | all year | 001 |
| Chromium, hexavalent [as Cr] | daily average | ≤ 5.27 lb/d | all year | 001 |
| Chromium, hexavalent [as Cr] | daily maximum | ≤ 10.8 lb/d | all year | 001 |
| Chromium, total [as Cr] | daily average | ≤ 15.9 lb/d | all year | 001 |
| Chromium, total [as Cr] | daily maximum | ≤ 41.9 lb/d | all year | 001 |
| Zinc, total [as Zn] | daily average | ≤ 6.47 lb/d | all year | 001 |
| Zinc, total [as Zn] | daily maximum | ≤ 13.7 lb/d | all year | 001 |
| Phenols | daily average | ≤ 9.99 lb/d | all year | 001 |
| Phenols | daily maximum | ≤ 21.3 lb/d | all year | 001 |
| Flow, in conduit or thru treatment plant | daily average | ≤ 3.3 MGD | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ 3.9 MGD | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily average | ≤ 294 lb/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 441 lb/d | all year | 001 |
| pH range excursions, > 60 minutes | monthly total | ≤ 0 occur/mo | all year | 001 |
| pH range excursions, monthly total accum | monthly total | ≤ 446 min | all year | 001 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 150 mg/L | all year | 002 |
| pH | minimum | ≥ 6 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 002 |
| Flow, in conduit or thru treatment plant | daily average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 150 mg/L | all year | 003 |
| pH | minimum | ≥ 6 SU | all year | 003 |
| pH | maximum | ≤ 9 SU | all year | 003 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 003 |
| Flow, in conduit or thru treatment plant | daily average | report only (MGD) | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 150 mg/L | all year | 005 |
| pH | minimum | ≥ 6 SU | all year | 005 |
| pH | maximum | ≤ 9 SU | all year | 005 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 005 |
| Flow, in conduit or thru treatment plant | daily average | report only (MGD) | all year | 005 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 005 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 150 mg/L | all year | 006 |
| pH | minimum | ≥ 6 SU | all year | 006 |
| pH | maximum | ≤ 9 SU | all year | 006 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 006 |
| Flow, in conduit or thru treatment plant | daily average | report only (MGD) | all year | 006 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 006 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 150 mg/L | all year | 007 |
| pH | minimum | ≥ 6 SU | all year | 007 |
| pH | maximum | ≤ 9 SU | all year | 007 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 007 |
| Flow, in conduit or thru treatment plant | daily average | report only (MGD) | all year | 007 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 007 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 150 mg/L | all year | 008 |
| pH | minimum | ≥ 6 SU | all year | 008 |
| pH | maximum | ≤ 9 SU | all year | 008 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 008 |
| Flow, in conduit or thru treatment plant | daily average | report only (MGD) | all year | 008 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 008 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | monthly average minimum | report only (pass=0;fail=1) | all year | TX1 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia menidia | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia menidia | monthly average minimum | report only (pass=0;fail=1) | all year | TX1 |
| NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 7-day minimum | report only (%) | all year | TX1 |
| NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | monthly average minimum | report only (%) | all year | TX1 |
| NOEC Lethal Static Renewal 7 Day Chronic Menidia menidia | 7-day minimum | report only (%) | all year | TX1 |
| NOEC Lethal Static Renewal 7 Day Chronic Menidia menidia | monthly average minimum | report only (%) | all year | TX1 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 7-day minimum | report only (%) | all year | TX1 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | monthly average minimum | report only (%) | all year | TX1 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia | 7-day minimum | report only (%) | all year | TX1 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia | monthly average minimum | report only (%) | all year | TX1 |
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | monthly average minimum | report only (pass=0;fail=1) | all year | TX1 |
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia | monthly average minimum | report only (pass=0;fail=1) | all year | TX1 |
| LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 7-day minimum | report only (%) | all year | TX1 |
| LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | monthly average minimum | report only (%) | all year | TX1 |
| LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia menidia | 7-day minimum | report only (%) | all year | TX1 |
| LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia menidia | monthly average minimum | report only (%) | all year | TX1 |
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | 7-day minimum | report only (%) | all year | TX1 |
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | monthly average minimum | report only (%) | all year | TX1 |
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Menidia menidia | 7-day minimum | report only (%) | all year | TX1 |
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Menidia menidia | monthly average minimum | report only (%) | all year | TX1 |
| LC50 Pass/Fail Static 24Hr Acute Americamysis bahia (formerly Mysidopsis bahia) | single sample | report only (pass=0;fail=1) | all year | TXA |
| LC50 Pass/Fail Static 24Hr Acute Menidia menidia | 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 32 Petroleum Refining and Related Industries permits in Texas.
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On EPA ECHO: Facility report · DMR history
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