Clean Water Act discharge permit · NPDES TXG310012
MUSTANG ISLAND ST 903S PLATFORM A, Corpus Christi, TX: NPDES TXG310012 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 28Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
MUSTANG ISLAND ST 903S PLATFORM A, held by Tr Offshore, LLC, holds NPDES permit TXG310012. EPA’s file records it issued April 23, 2024 and expiring January 16, 2029. 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 | MUSTANG ISLAND ST 903S PLATFORM A |
|---|---|
| Permittee as filed | Tr Offshore, LLC |
| NPDES ID | TXG310012 |
| Permit status | Effective |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | April 23, 2024 |
| Expiration date | January 16, 2029 |
| Address | Corpus Christi, TX 78413 |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 28Pollutants on file
- 28Under a numeric limit
- 28With a violation of any kind
- 2With 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 |
|---|---|---|---|---|---|
| Oil & Grease | 2 | 32 | 4 | October 31, 2024 | 341% over the limit |
| Whole Effluent Toxicity [WET] - Americamysis bahia (formerly Mysidopsis bahia) | 3 | 19 | 2 | September 30, 2024 | 99,999% over the limit |
| Free Oil Visual Sheen | 2 | 29 | 0 | ||
| pH | 2 | 28 | 0 | ||
| Copper, total [as Cu] | 2 | 28 | 0 | ||
| Manganese, total [as Mn] | 2 | 28 | 0 | ||
| Zinc, total [as Zn] | 2 | 28 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 28 | 0 | ||
| Whole Effluent Toxicity [WET] - M. beryllina | 3 | 17 | 0 | ||
| BOD, carbonaceous [5 day, 20 C] | 1 | 16 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | 2 | 14 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia beryllina | 2 | 14 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 2 | 14 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Menidia beryllina | 2 | 14 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 2 | 14 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina | 2 | 14 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 2 | 14 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina | 2 | 14 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 2 | 14 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia beryllina | 2 | 14 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | 2 | 14 | 0 | ||
| LOEC Sub-Lethal Growth Static Renewal 7 Day Chronic Menidia beryllina | 2 | 14 | 0 | ||
| Ammonia nitrogen, total, [as N] 30 day | 1 | 14 | 0 | ||
| Mercury, total [as Hg] | 1 | 14 | 0 | ||
| Produced water, TDS | 1 | 4 | 0 | ||
| Temperature Increase Deg. F | 1 | 4 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute Americamysis bahia (formerly Mysidopsis bahia) | 1 | 3 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute Menidia beryllina | 1 | 3 | 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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES TXG310012.
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.
Watch this permit
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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 TXG310012 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.