Clean Water Act discharge permit · NPDES TX0077887

EXXONMOBIL BAYTOWN OLEFINS PLANT, Baytown, TX: NPDES TX0077887 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
4Pollutants under a numeric limit
4Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

EXXONMOBIL BAYTOWN OLEFINS PLANT, held by EXXON MOBIL CORPORATION, holds NPDES permit TX0077887, which discharges to Unnamed Ditch, W Fork Goose Creek,. EPA’s file records it issued January 22, 2014 and expiring August 1, 2018.

EXXONMOBIL BAYTOWN OLEFINS PLANT, Baytown, Texas: Individual permit TX0077887, held by EXXON MOBIL CORPORATION; Administratively continued (past its expiration date and still in force until reissued); issued January 22, 2014, term to August 1, 2018; discharges to UNNAMED DITCH, W FORK GOOSE CREEK,.

Carbon, tot organic [TOC]: 1 limit, 6 violations of any kind, 5 effluent exceedances, latest April 30, 2025, largest 72% over the limit.
pH: 2 limits, 3 violations of any kind, 1 effluent exceedance, latest July 31, 2007.
Phenol: 0 limits, 1 violation of any kind, 1 effluent exceedance, latest July 31, 2022, largest 11% over the limit.
Naphthalene: 0 limits, 1 violation of any kind, 1 effluent exceedance, latest July 31, 2022, largest 106% over the limit.
Oil & Grease: 1 limit, 3 violations of any kind, 0 effluent exceedances.
Flow, in conduit or thru treatment plant: 2 limits, 2 violations of any kind, 0 effluent exceedances.

July 11, 2025: Permit Violations - Violation Specified in Comment (ST6).

Other permits held by EXXON MOBIL CORPORATION

MONT BELVIEU PLASTICS PLANT, Mont Belvieu: TX0089125, issued July 2, 2019
EXXONMOBIL NORTH HOUSTON TERMI, Houston: TXG830108, issued November 19, 2008

EXXONMOBIL BAYTOWN OLEFINS PLANT among its neighbors

EPA’s permit file holds 112 discharge permits in the Goose Creek-Frontal Galveston Bay subwatershed (HUC 120401040706), TX0077887 among them. Its county holds 4,455, 195 of them major permits; TX0077887 is a minor permit.

Other permits in the Goose Creek-Frontal Galveston Bay subwatershed (HUC 120401040706)

AIR LIQUIDE BAYTOWN ASU FACILITY, Baytown: TXR1583VZ, minor permit, discharging to BURNET BAY, permit term to March 4, 2028
AIR PRODUCTS LA PORTE PLANT, La Porte: TX0004944, minor permit, discharging to DRAINAGE DITCH;HCFCD F103-00-00;SAN JACINTO BAY, permit term to July 12, 2023
AIR PRODUCTS LA PORTE PLANT, La Porte: TXR1595PW, minor permit, permit term to March 4, 2028
AIRGAS DRY ICE FACILITY, La Porte: TX0136638, minor permit, discharging to San Jacinto Bay, permit term to March 31, 2024
BARBOURS CUT TERMINAL, La Porte: TXR05GM41, minor permit, permit term to August 13, 2026
BATTLEGROUND CHLOR ALKALI PLANT, La Porte: TX0008150, major permit, discharging to SEG 1005 SAN JACINTO RIVER BASIN, permit term to July 1, 2020
BATTLEGROUND ROAD FACILITY, La Porte: TX0077585, minor permit, discharging to DRAINAGE DITCH;TIDAL RD;TUCKER BAYO, permit term to May 1, 2013
BAYTOWN ACE INDUSTRIAL SERVICES, Baytown: TXR05FO27, minor permit, permit term to August 13, 2026
BAYTOWN CENTRAL, Baytown: TXR1557NT, minor permit, discharging to CARY BAYOU, permit term to March 4, 2028
BAYTOWN FIRE STATION NO 2, Baytown: TXR1552XS, minor permit, discharging to GOOSE CREEK TIDAL, permit term to March 4, 2028

Identity

Facility as filed	EXXONMOBIL BAYTOWN OLEFINS PLANT
Permittee as filed	EXXON MOBIL CORPORATION
NPDES ID	TX0077887
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Individual permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	January 22, 2014
Expiration date	August 1, 2018
Address	Baytown, TX 77520
Receiving water	UNNAMED DITCH, W FORK GOOSE CREEK,
Subwatershed	Goose Creek-Frontal Galveston Bay (HUC 120401040706)
Other EPA IDs (FRS)	RCRA handler TXD980625966; ICIS-AIR source TX0000004820100014

Effluent limits and exceedances

6Pollutants on file
4Under a numeric limit
6With a violation of any kind
4With 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
Carbon, tot organic [TOC]	1	6	5	April 30, 2025	72% over the limit
pH	2	3	1	July 31, 2007
Phenol	0	1	1	July 31, 2022	11% over the limit
Naphthalene	0	1	1	July 31, 2022	106% over the limit
Oil & Grease	1	3	0
Flow, in conduit or thru treatment plant	2	2	0

Inspections, violations and enforcement

1Single-event violations

Date	What EPA recorded	Agency
July 11, 2025	Permit Violations - Violation Specified in Comment	ST6

Inspections

EPA’s inspection file holds no inspection for NPDES TX0077887.

Formal enforcement and penalties

0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.

Informal enforcement

EPA’s informal enforcement file holds no action for NPDES TX0077887.

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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

This public-records page covers NPDES permit TX0077887 for the EXXONMOBIL BAYTOWN OLEFINS PLANT in Baytown, TX, held by EXXON MOBIL CORPORATION, with its status shown as administratively continued and its discharger class as Minor. The listing records 4 pollutants under a numeric limit and 4 pollutants with an effluent exceedance, and the permit is shown as issued January 22, 2014 with an expiration date of August 1, 2018, in the Goose Creek-Frontal Galveston Bay subwatershed (HUC 120401040706).