Clean Water Act discharge permit · NPDES TX0006271
EXXON MOBIL BAYTOWN REFINERY COMPLEX, Baytown, TX: NPDES TX0006271 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 36Pollutants under a numeric limit
- 9Pollutants with an effluent exceedance
EXXON MOBIL BAYTOWN REFINERY COMPLEX, held by EXXONMOBIL REFINING & SUPPLY C, holds NPDES permit TX0006271, which discharges to Houston Ship Channel/San Jacinto Ri. EPA’s file records it issued September 25, 2015 and expiring July 1, 2020. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | EXXON MOBIL BAYTOWN REFINERY COMPLEX |
|---|---|
| Permittee as filed | EXXONMOBIL REFINING & SUPPLY C |
| NPDES ID | TX0006271 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | September 25, 2015 |
| Expiration date | July 1, 2020 |
| Address | Baytown, TX 77520 |
| Receiving water | HOUSTON SHIP CHANNEL/SAN JACINTO RI |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Goose Creek-Frontal Galveston Bay (HUC 120401040706) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 36Pollutants on file
- 36Under a numeric limit
- 35With a violation of any kind
- 9With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Sulfide, total [as S] | 4 | 17 | 8 | July 31, 2025 | 279% over the limit |
| Flow, in conduit or thru treatment plant | 8 | 23 | 6 | July 31, 2021 | 99,999% over the limit |
| Enterococci | 4 | 4 | 4 | December 31, 2019 | 99,999% over the limit |
| Oil & Grease | 6 | 16 | 3 | August 31, 2017 | 63% over the limit |
| Solids, total suspended | 4 | 13 | 3 | November 30, 2022 | 492% over the limit |
| Temperature, water deg. fahrenheit | 3 | 10 | 3 | June 30, 2022 | 1% over the limit |
| Phenolic compounds, total | 4 | 14 | 2 | September 30, 2005 | 89% over the limit |
| pH | 8 | 22 | 1 | April 30, 2009 | |
| Carbon, tot organic [TOC] | 6 | 16 | 1 | July 31, 2021 | 2% over the limit |
| Nitrogen, nitrate total [as N] | 6 | 127 | 0 | ||
| Nitrogen, ammonia total [as N] | 4 | 10 | 0 | ||
| BOD, carbonaceous [5 day, 20 C] | 4 | 10 | 0 | ||
| Chromium, hexavalent [as Cr] | 4 | 9 | 0 | ||
| Chromium, total [as Cr] | 4 | 7 | 0 | ||
| Copper, total [as Cu] | 2 | 6 | 0 | ||
| Polynuclear Aromatic Hydrocarbons [PAHs] | 2 | 5 | 0 | ||
| Benzene, ethylbenzene, toluene, xylene combination | 2 | 5 | 0 | ||
| Benzene | 2 | 5 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | 4 | 4 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia menidia | 4 | 4 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 4 | 4 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Menidia menidia | 4 | 4 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 4 | 4 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia | 4 | 4 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 4 | 4 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia | 4 | 4 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 4 | 4 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia menidia | 4 | 4 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | 4 | 4 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Menidia menidia | 4 | 4 | 0 | ||
| Zinc, total [as Zn] | 1 | 2 | 0 | ||
| Whole effluent toxicity - retest #1 | 7 | 1 | 0 | ||
| Whole effluent toxicity - retest #2 | 7 | 1 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute Americamysis bahia (formerly Mysidopsis bahia) | 1 | 1 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute Menidia menidia | 1 | 1 | 0 | ||
| Chlorine, total residual | 1 | 0 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 2Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| June 27, 2024 | Permit Violations - Violation Specified in Comment | ST6 |
| May 5, 2022 | Permit Violations - Violation Specified in Comment | ST6 |
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID TX0006271 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.