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Petroleum Refining, major discharger, Norco, Louisiana. NPDES permit LA0052051, in force until Jun 30, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | monthly average | ≤ 3664 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 6593 lb/d | all year | 001 |
| Oxygen demand, chem. [high level] [COD] | monthly average | ≤ 25470 lb/d | all year | 001 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 49191 lb/d | all year | 001 |
| pH | instantaneous minimum | report only (SU) | all year | 001 |
| pH | instantaneous maximum | report only (SU) | all year | 001 |
| Solids, total suspended | monthly average | ≤ 2939 lb/d | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 4604 lb/d | all year | 001 |
| Oil & Grease | monthly average | ≤ 1078 lb/d | all year | 001 |
| Oil & Grease | daily maximum | ≤ 2025 lb/d | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1855 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4080 lb/d | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year | 001 |
| Sulfide, total [as S] | monthly average | ≤ 17.9 lb/d | all year | 001 |
| Sulfide, total [as S] | daily maximum | ≤ 40.2 lb/d | all year | 001 |
| Chromium, hexavalent [as Cr] | monthly average | ≤ 2.2 lb/d | all year | 001 |
| Chromium, hexavalent [as Cr] | daily maximum | ≤ 5 lb/d | all year | 001 |
| Chromium, total [as Cr] | monthly average | ≤ 25.9 lb/d | all year | 001 |
| Chromium, total [as Cr] | daily maximum | ≤ 74.6 lb/d | all year | 001 |
| Phenolics, total recoverable | monthly average | ≤ 22.2 lb/d | all year | 001 |
| Phenolics, total recoverable | daily maximum | ≤ 49 lb/d | 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 |
| 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 |
| Solids, total suspended, non-algal | monthly average | ≤ 2939 lb/d | May–Sep | 001 |
| Solids, total suspended, non-algal | daily maximum | ≤ 4604 lb/d | May–Sep | 001 |
| Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex | 48-hour minimum | report only (pass=0;fail=1) | all year | 001 |
| Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex | monthly average minimum | report only (pass=0;fail=1) | all year | 001 |
| LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas | 48-hour minimum | report only (pass=0;fail=1) | all year | 001 |
| LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas | monthly average minimum | report only (pass=0;fail=1) | all year | 001 |
| NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex | 48-hour minimum | report only (%) | all year | 001 |
| NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex | monthly average minimum | report only (%) | all year | 001 |
| NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas | 48-hour minimum | report only (%) | all year | 001 |
| NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas | monthly average minimum | report only (%) | all year | 001 |
| Coef Of Var Static Renewal 48Hr Acute D. pulex | maximum | report only (%) | all year | 001 |
| Coef Of Var Static Renewal 48Hr Acute Pimephales promelas | maximum | report only (%) | all year | 001 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 002 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 002 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 002 |
| Carbon, tot organic [TOC] | daily maximum | ≤ 50 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 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 003 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 003 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 003 |
| Carbon, tot organic [TOC] | daily maximum | ≤ 50 mg/L | all year | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 004 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 004 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 004 |
| Carbon, tot organic [TOC] | daily maximum | ≤ 50 mg/L | all year | 004 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 005 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 005 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 006 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 006 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 006 |
| Carbon, tot organic [TOC] | daily maximum | ≤ 50 mg/L | all year | 006 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 006 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 006 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 007 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 007 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 007 |
| Carbon, tot organic [TOC] | daily maximum | ≤ 50 mg/L | all year | 007 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 007 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 007 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 010 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 010 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 010 |
| Carbon, tot organic [TOC] | daily maximum | ≤ 50 mg/L | all year | 010 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 010 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 010 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 102 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 102 |
| Solids, total suspended | daily maximum | ≤ 90 mg/L | all year | 102 |
| Solids, total suspended | daily maximum | ≤ 90 mg/L | all year | 102 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 102 |
| Carbon, tot organic [TOC] | daily maximum | ≤ 50 mg/L | all year | 102 |
| Lead, total [as Pb] | daily maximum | ≤ 50 ug/L | all year | 102 |
| Benzene | daily maximum | ≤ 50 ug/L | all year | 102 |
| BTEX | daily maximum | ≤ 250 ug/L | all year | 102 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 102 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 102 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | IT01 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | IT01 |
Cited limits by parameter: Louisiana's rules and the federal ones.
Same industry: the 26 Petroleum Refining and Related Industries permits in Louisiana.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/LA0052051 · MCP: https://passage-data.com/mcp