NPDES TX0135917 · Clean Water Act

CHEVRON PHILLIPS CHEMICAL SWEENY OLD OCEAN PLANT, Sweeny, TX: NPDES TX0135917 discharge permit, effluent exceedances, inspections, penalties

CHEVRON PHILLIPS CHEMICAL SWEENY OLD OCEAN PLANT, Sweeny, Texas: Individual permit TX0135917, held by CHEVRON PHILLIPS CHEMICAL CO LP; Effective; issued August 28, 2019, term to August 28, 2024; discharges to UNNAMED TRIB;LITTLE ILINNVILLE BAYOU.

54 of the 60 pollutants listed for NPDES TX0135917 have no violation or effluent exceedance.

pH: 6 limits, 5 violations of any kind, 5 effluent exceedances, latest March 31, 2025.
pH range excursions, > 60 minutes: 2 limits, 3 violations of any kind, 3 effluent exceedances, latest September 30, 2018, largest 2,147,483,650% over the limit.
BOD, 5-day, 20 deg. C: 4 limits, 2 violations of any kind, 2 effluent exceedances, latest September 30, 2022, largest 15% over the limit.
Solids, total suspended: 2 limits, 2 violations of any kind, 2 effluent exceedances, latest January 31, 2023, largest 90% over the limit.
Oil & Grease: 1 limit, 2 violations of any kind, 2 effluent exceedances, latest July 31, 2025, largest 452% over the limit.
Flow, in conduit or thru treatment plant: 8 limits, 1 violation of any kind, 1 effluent exceedance, latest January 31, 2023, largest 31% over the limit.
Zinc, total [as Zn]: 6 limits.
Chlorine, free available: 6 limits.
Whole effluent toxicity - retest #1: 3 limits.
Whole effluent toxicity - retest #2: 3 limits.
Carbon tetrachloride: 2 limits.
Chloroform: 2 limits.
Toluene: 2 limits.
Benzene: 2 limits.
Acenaphthylene: 2 limits.
Acenaphthene: 2 limits.
Acrylonitrile: 2 limits.
Anthracene: 2 limits.
Benzo[b]fluoranthene: 2 limits.
Benzo[k]fluoranthene: 2 limits.
Benzo[a]pyrene: 2 limits.
Chlorobenzene: 2 limits.
Chloroethane, total weight: 2 limits.
Chrysene: 2 limits.
Diethyl phthalate: 2 limits.
Dimethyl phthalate: 2 limits.
Ethylbenzene: 2 limits.
Fluoranthene: 2 limits.
Fluorene: 2 limits.
Hexachlorobutadiene: 2 limits.
Hexachloroethane: 2 limits.
Methyl chloride [Chloromethane]: 2 limits.
Methylene chloride: 2 limits.
Nitrobenzene: 2 limits.
Phenanthrene: 2 limits.
Pyrene: 2 limits.
Tetrachloroethylene: 2 limits.
1,1-Dichloroethane: 2 limits.
1,1-Dichloroethylene: 2 limits.
1,1,1-Trichloroethane: 2 limits.
1,1,2-Trichloroethane: 2 limits.
Benzo[a]anthracene: 2 limits.
1,2-Dichloroethane, total weight: 2 limits.
1,2-Dichlorobenzene: 2 limits.
1,2-Dichloropropane: 2 limits.
trans-1,2-Dichloroethylene: 2 limits.
1,2,4-Trichlorobenzene: 2 limits.
1,3-Dichloropropene, total weight: 2 limits.
1,3-Dichlorobenzene: 2 limits.
1,4-Dichlorobenzene: 2 limits.
2-Nitrophenol: 2 limits.
2,4-Dimethylphenol: 2 limits.
2,4-Dinitrophenol: 2 limits.
4-Nitrophenol: 2 limits.
4,6-Dinitro-o-cresol: 2 limits.
Phenol: 2 limits.
Naphthalene: 2 limits.
Di[2-ethylhexyl] phthalate [DEHP]: 2 limits.
Di-n-butyl phthalate: 2 limits.
Vinyl chloride: 2 limits.

May 19, 2026: Evaluation (S).
June 6, 2023: Permit Violations - Violation Specified in Comment (ST6).
January 10, 2019: Permit Violations - Violation Specified in Comment (ST6).

CHEVRON PHILLIPS CHEMICAL SWEENY OLD OCEAN PLANT among its neighbors

9 discharge permits are in the Brazos River-Gulf of Mexico subwatershed (HUC 120701040505); TX0135917 is one. Its county: 522, 24 major; TX0135917 is major permit.

Other permits in the Brazos River-Gulf of Mexico subwatershed (HUC 120701040505)

BAR X RANCH, Angelton: TXR1501PN, minor, term to 2028-03-04
BRAZOS RIVER DIVERSION CHANNEL PIPELINE REPLACEMENT, Freeport: TXR1568PE, minor, term to 2028-03-04
BRAZOSPORT WATER AUTHORITY PLANT, Lake Jackson: TX0135887, minor, term to 2024-07-30
CITY OF FREEPORT CENTRAL WWTP, Freeport: TX0033332, major, term to 2025-05-08
CITY OF LAKE JACKSON WWTP, Lake Jackson: TX0025798, major, term to 2024-08-14
FREEPORT TEXAS OPERATIONS, Freeport: TX0006483, major, term to 2014-07-01
HMSS PLANT - LAKE JACKSON, Lake Jackson: TXR05GU26, minor, term to 2026-08-13
SWEENY REFINERY AND PETROCHEMICAL COMPLEX, Sweeny: TX0007536, major, term to 2019-07-01

Identity

Facility	CHEVRON PHILLIPS CHEMICAL SWEENY OLD OCEAN PLANT
Permittee	CHEVRON PHILLIPS CHEMICAL CO LP
NPDES ID	TX0135917
Status	Effective
Type	Individual permit
Class	Major
Facility type	Non-POTW
Issued	August 28, 2019
Expires	August 28, 2024
Address	Sweeny, TX 77480
Receiving water	UNNAMED TRIB;LITTLE ILINNVILLE BAYOU
Subwatershed	Brazos River-Gulf of Mexico (HUC 120701040505)
SIC	2821 – Plastics Materials And Resins
Other EPA IDs (FRS)	RCRA handler TXR000039834; ICIS-AIR source TX0000004803900145

NPDES TX0135917: effluent limits and exceedances

CHEVRON PHILLIPS CHEMICAL SWEENY OLD OCEAN PLANT (NPDES TX0135917): 79 pollutants on file, 79 limited; 6 with a violation of any kind, 6 with an exceedance.

The 60 with the most exceedances of the 79 on file for NPDES TX0135917. How exceedances are counted.

Pollutant	Limits	Violations	Exceedances	Latest	Largest, as filed
pH	6	5	5	March 31, 2025
pH range excursions, > 60 minutes	2	3	3	September 30, 2018	2,147,483,650% over the limit
BOD, 5-day, 20 deg. C	4	2	2	September 30, 2022	15% over the limit
Solids, total suspended	2	2	2	January 31, 2023	90% over the limit
Oil & Grease	1	2	2	July 31, 2025	452% over the limit
Flow, in conduit or thru treatment plant	8	1	1	January 31, 2023	31% over the limit
Zinc, total [as Zn]	6	0	0
Chlorine, free available	6	0	0
Whole effluent toxicity - retest #1	3	0	0
Whole effluent toxicity - retest #2	3	0	0
Carbon tetrachloride	2	0	0
Chloroform	2	0	0
Toluene	2	0	0
Benzene	2	0	0
Acenaphthylene	2	0	0
Acenaphthene	2	0	0
Acrylonitrile	2	0	0
Anthracene	2	0	0
Benzo[b]fluoranthene	2	0	0
Benzo[k]fluoranthene	2	0	0
Benzo[a]pyrene	2	0	0
Chlorobenzene	2	0	0
Chloroethane, total weight	2	0	0
Chrysene	2	0	0
Diethyl phthalate	2	0	0
Dimethyl phthalate	2	0	0
Ethylbenzene	2	0	0
Fluoranthene	2	0	0
Fluorene	2	0	0
Hexachlorobutadiene	2	0	0
Hexachloroethane	2	0	0
Methyl chloride [Chloromethane]	2	0	0
Methylene chloride	2	0	0
Nitrobenzene	2	0	0
Phenanthrene	2	0	0
Pyrene	2	0	0
Tetrachloroethylene	2	0	0
1,1-Dichloroethane	2	0	0
1,1-Dichloroethylene	2	0	0
1,1,1-Trichloroethane	2	0	0
1,1,2-Trichloroethane	2	0	0
Benzo[a]anthracene	2	0	0
1,2-Dichloroethane, total weight	2	0	0
1,2-Dichlorobenzene	2	0	0
1,2-Dichloropropane	2	0	0
trans-1,2-Dichloroethylene	2	0	0
1,2,4-Trichlorobenzene	2	0	0
1,3-Dichloropropene, total weight	2	0	0
1,3-Dichlorobenzene	2	0	0
1,4-Dichlorobenzene	2	0	0
2-Nitrophenol	2	0	0
2,4-Dimethylphenol	2	0	0
2,4-Dinitrophenol	2	0	0
4-Nitrophenol	2	0	0
4,6-Dinitro-o-cresol	2	0	0
Phenol	2	0	0
Naphthalene	2	0	0
Di[2-ethylhexyl] phthalate [DEHP]	2	0	0
Di-n-butyl phthalate	2	0	0
Vinyl chloride	2	0	0

NPDES TX0135917: inspections, violations and enforcement

NPDES TX0135917: 2 single-event violations

Date	What EPA recorded	Agency
June 6, 2023	Permit Violations - Violation Specified in Comment	ST6
January 10, 2019	Permit Violations - Violation Specified in Comment	ST6

NPDES TX0135917: 1 inspection

Date	What EPA recorded	Agency
May 19, 2026	Evaluation	S

NPDES TX0135917 (CHEVRON PHILLIPS CHEMICAL SWEENY OLD OCEAN PLANT): no formal enforcement action and informal enforcement action on file.

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Permits near NPDES TX0135917

NPDES TX0135917: 79 pollutant rows, 3 dated events; ICIS-NPDES download, loaded October 14, 2026.