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Clean Water Act discharge permit · NPDES TX0007013

EXXONMOBIL BAYTOWN CHEMICAL PLANT, Baytown, TX: NPDES TX0007013 discharge permit, effluent exceedances, inspections, penalties

EXXONMOBIL BAYTOWN CHEMICAL PLANT, held by EXXON MOBILCORPORATION, holds NPDES permit TX0007013, which discharges to Nine-Foot Diameter Pipe. EPA’s file records it issued December 21, 2015 and expiring August 1, 2018. 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 filedEXXONMOBIL BAYTOWN CHEMICAL PLANT
Permittee as filedEXXON MOBILCORPORATION
NPDES IDTX0007013
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
IssuedDecember 21, 2015
Expiration dateAugust 1, 2018
AddressBaytown, TX 77520
Receiving waterNINE-FOOT DIAMETER PIPE

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; the 60 with the most exceedances of 62 are shown.

Pollutant or measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
Solids, total suspended21010August 31, 2025296% over the limit
pH6249December 31, 2023
Oil & Grease3167November 30, 201938,488% over the limit
Benzo[a]pyrene255December 31, 2018567% over the limit
Phenanthrene255December 31, 2018178% over the limit
Benzo[a]anthracene255December 31, 2018567% over the limit
Hexachlorobenzene255December 31, 201838,362% over the limit
Carbon, tot organic [TOC]3104August 31, 202587% over the limit
Toluene244July 31, 200730,507% over the limit
Zinc, total [as Zn]273August 31, 2025267% over the limit
Acrylonitrile233December 31, 2018127% over the limit
Trichloroethylene233July 31, 2007450% over the limit
Copper, total [as Cu]262August 31, 202560% over the limit
Ethylbenzene211July 31, 2006111% over the limit
Hexachlorobutadiene211June 30, 201549% over the limit
Discharge event observation [Visual Monitoring]1270
Flow, in conduit or thru treatment plant6120
Xylene [mix of m+o+p]110
BOD, 5-day, 20 deg. C200
Carbon tetrachloride200
1,2-Dichloroethane200
Chloroform200
Benzene200
Acenaphthylene200
Acenaphthene200
Anthracene200
Benzo[b]fluoranthene200
Benzo[k]fluoranthene200
Chlorobenzene200
Chrysene200
Diethyl phthalate200
Dimethyl phthalate200
Fluoranthene200
Fluorene200
Hexachloroethane200
Methyl chloride [Chloromethane]200
Methylene chloride200
Nitrobenzene200
Pyrene200
Tetrachloroethylene200
1,1-Dichloroethane200
1,1-Dichloroethylene200
1,1,1-Trichloroethane200
1,1,2-Trichloroethane200
1,2-Dichlorobenzene200
1,2-Dichloropropane200
trans-1,2-Dichloroethylene200
1,2,4-Trichlorobenzene200
1,3-Dichlorobenzene200
1,4-Dichlorobenzene200
2-Nitrophenol200
2,4-Dimethylphenol200
2,4-Dinitrophenol200
4-Nitrophenol200
4,6-Dinitro-o-cresol200
Phenol200
Naphthalene200
Di[2-ethylhexyl] phthalate [DEHP]200
Di-n-butyl phthalate200
Vinyl chloride200

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

DateWhat EPA recordedAgency
November 4, 2025Permit Violations - Violation Specified in CommentST6

Velarion’s copy of EPA’s ICIS-NPDES files does not yet 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, TX0007013.

Start the watch

How often?
  • One permit holder — $99/month
  • One watershed — $2,990/year
  • One state — $4,990/year
  • The whole register — $18,000/year

How we handle your data → Privacy

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 TX0007013 there.

Nearby on the register

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