Clean Water Act discharge permit · NPDES GMG290571
ROWAN COMPANIES, INC., Houston, TX: NPDES GMG290571 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 30Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
ROWAN COMPANIES, INC. holds NPDES permit GMG290571. EPA’s file records it issued September 28, 2012 and expiring September 30, 2017. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | ROWAN COMPANIES, INC. |
|---|---|
| Permittee as filed | ROWAN COMPANIES, INC. |
| NPDES ID | GMG290571 |
| 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 | September 28, 2012 |
| Expiration date | September 30, 2017 |
| Issuing agency | Region 6 |
| Address | Houston, TX 77056 |
| Subwatershed | City of Houston-Buffalo Bayou (HUC 120401040305) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 30Pollutants on file
- 30Under a numeric limit
- 30With a violation of any kind
- 0With 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 |
|---|---|---|---|---|---|
| Cooling Water Intake Velocity | 87 | 17 | 0 | ||
| Domestic waste, foam and floating solids | 29 | 8 | 0 | ||
| Deck drainage, free oil | 29 | 7 | 0 | ||
| Cooling Water Entrainment Monitoring Study | 29 | 6 | 0 | ||
| Screen Area Blockage | 29 | 5 | 0 | ||
| Intake Velocity Excusions | 29 | 5 | 0 | ||
| Fish/Shellfish Impinged | 29 | 5 | 0 | ||
| Sanitary waste, residual chlorine | 29 | 5 | 0 | ||
| Sanitary waste, solids | 29 | 5 | 0 | ||
| Cooling Water Baseline Study | 29 | 5 | 0 | ||
| Cooling Water Intake Inspection | 29 | 5 | 0 | ||
| Maintenance Waste: Are you using a BMP? | 25 | 5 | 0 | ||
| Maintenance Waste: Do you have a BMP? | 25 | 4 | 0 | ||
| Whole effluent toxicity | 20 | 2 | 0 | ||
| Pass/Fail Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 20 | 2 | 0 | ||
| Pass/Fail Static Renewal 7Day Chronic Menidia | 20 | 2 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | 20 | 2 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia menidia | 20 | 2 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 20 | 2 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Menidia menidia | 20 | 2 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 20 | 2 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia | 20 | 2 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 20 | 2 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia menidia | 20 | 2 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | 20 | 2 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Menidia menidia | 20 | 2 | 0 | ||
| Misc. free oil in Western GOM, OCS | 10 | 1 | 0 | ||
| Critical Dilution | 10 | 1 | 0 | ||
| Coef Of Var Static Renewal 7Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 10 | 1 | 0 | ||
| Coef Of Var Static Renewal 7Day Chronic Menidia menidia | 10 | 1 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES GMG290571.
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 GMG290571.
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 GMG290571 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.