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Clean Water Act discharge permit · NPDES GMG290563

SEVAN DRILLING, Houston, TX: NPDES GMG290563 discharge permit, effluent exceedances, inspections, penalties

SEVAN DRILLING, held by Sevan Drilling, holds NPDES permit GMG290563. 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 filedSEVAN DRILLING
Permittee as filedSevan Drilling
NPDES IDGMG290563
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeCoverage under a general permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
IssuedSeptember 28, 2012
Expiration dateSeptember 30, 2017
Issuing agencyRegion 6
AddressHouston, TX 77041
SubwatershedSpring Branch-Buffalo Bayou (HUC 120401040303)

Cited to the EPA ICIS-NPDES permit file (ECHO download).

Effluent limits and exceedances

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 measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
Cooling Water Intake Velocity12720
Screen Area Blockage4250
Fish/Shellfish Impinged4250
Sanitary waste, residual chlorine4250
Cooling Water Entrainment Monitoring Study4250
Intake Velocity Excusions4220
Deck drainage, free oil4220
Sanitary waste, solids4220
Domestic waste, foam and floating solids4220
Cooling Water Baseline Study4220
Cooling Water Intake Inspection4220
Maintenance Waste: Do you have a BMP?3220
Maintenance Waste: Are you using a BMP?3220

EPA’s effluent violation file records no exceedance of a numeric limit for NPDES GMG290563.

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

EPA’s single-event violation file, as loaded, holds no violation for NPDES GMG290563.

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

One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, GMG290563.

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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 GMG290563 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.