Clean Water Act discharge permit · NPDES GMG290041
XTO OFFSHORE, INC., Houston, TX: NPDES GMG290041 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 45Pollutants under a numeric limit
- 3Pollutants with an effluent exceedance
XTO OFFSHORE, INC. holds NPDES permit GMG290041, which discharges to Gulf Of Mexico. EPA’s file records it issued June 7, 2007 and expiring September 30, 2012. 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 | XTO OFFSHORE, INC. |
|---|---|
| Permittee as filed | XTO OFFSHORE, INC. |
| NPDES ID | GMG290041 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | June 7, 2007 |
| Expiration date | September 30, 2012 |
| Address | Houston, TX 77056 |
| Receiving water | GULF OF MEXICO |
| Subwatershed | City of Houston-Buffalo Bayou (HUC 120401040305) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 46Pollutants on file
- 45Under a numeric limit
- 31With a violation of any kind
- 3With 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 |
|---|---|---|---|---|---|
| Drilling fluid, toxicity | 110 | 4 | 2 | March 31, 2008 | 99,999% over the limit |
| Drilling fluid, end of well, 96-hr LC50 | 55 | 2 | 1 | March 31, 2008 | 99,999% over the limit |
| Produced water, oil and grease | 110 | 1 | 1 | March 31, 2008 | 231% over the limit |
| Well fluids, oil & grease | 110 | 2 | 0 | ||
| Whole effluent toxicity | 110 | 2 | 0 | ||
| Pass/Fail Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 110 | 2 | 0 | ||
| Pass/Fail Static Renewal 7Day Chronic Menidia | 110 | 2 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | 110 | 2 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia menidia | 110 | 2 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 110 | 2 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Menidia menidia | 110 | 2 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 110 | 2 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia | 110 | 2 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 110 | 2 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia menidia | 110 | 2 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | 110 | 2 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Menidia menidia | 110 | 2 | 0 | ||
| Misc. free oil in Western GOM, OCS | 110 | 1 | 0 | ||
| Cadmium [Cd], in barite, dry weight | 55 | 1 | 0 | ||
| Mercury [Hg], in barite, dry weight | 55 | 1 | 0 | ||
| Drilling fluids, free oil | 55 | 1 | 0 | ||
| Drilling fluids, discharge rate | 55 | 1 | 0 | ||
| Drill cuttings, free oil | 55 | 1 | 0 | ||
| Deck drainage, free oil | 55 | 1 | 0 | ||
| Well fluids, free oil | 55 | 1 | 0 | ||
| Sanitary waste, residual chlorine | 55 | 1 | 0 | ||
| Sanitary waste, solids | 55 | 1 | 0 | ||
| Domestic waste, foam and floating solids | 55 | 1 | 0 | ||
| Coef Of Var Static Renewal 7Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 55 | 1 | 0 | ||
| Coef Of Var Static Renewal 7Day Chronic Menidia menidia | 55 | 1 | 0 | ||
| Critical Dilution | 0 | 1 | 0 | ||
| LF Pass/Fail Static Renewal 48Hr Acute Americamysis bahia (formerly Mysidopis bahia) | 110 | 0 | 0 | ||
| Low Flow Pass/Fail Static Renewal 48Hr Acute Menidia menidia | 110 | 0 | 0 | ||
| Flow | 55 | 0 | 0 | ||
| Produced water, free oil | 55 | 0 | 0 | ||
| Produced water, flow | 55 | 0 | 0 | ||
| Maintenance Waste: Do you have a BMP? | 55 | 0 | 0 | ||
| Maintenance Waste: Are you using a BMP? | 55 | 0 | 0 | ||
| NOAEC Lethal Static Renewal 48HR Acute Americamysis bahia (formerly Mysidopsis bahia) | 55 | 0 | 0 | ||
| NOAEC Lethal Static Renewal 48HR Acute Menidia menidia | 55 | 0 | 0 | ||
| Discharge drill cuttings, base fluids retained | 6 | 0 | 0 | ||
| Discharge drill cuttings, sediment toxicity | 4 | 0 | 0 | ||
| Discharge drill cuttings, formation oil | 4 | 0 | 0 | ||
| Stock base fluid, PAH | 2 | 0 | 0 | ||
| Stock base fluid, sediment toxicity | 2 | 0 | 0 | ||
| Stock base fluid, biodegredation rate | 2 | 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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES GMG290041.
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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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.