Velarion Records
Follow this permit Velarion Records emails you this permit’s record, cited to the public filing, and tells you when the register changes it. Free.
We’ll email you a link to confirm. The continuous daily watch on every change is the paid alert. Unsubscribe any time.
Also free: The Pay Desk, the weekly executive pay briefing.

Clean Water Act discharge permit · NPDES TX0004863

SHELL OIL DEER PARK, Deer Park, TX: NPDES TX0004863 discharge permit, effluent exceedances, inspections, penalties

SHELL OIL DEER PARK, held by SHELL CHEMICAL LP, holds NPDES permit TX0004863, which discharges to Patrick Bayou Tidal Portion Of Hous. EPA’s file records it issued December 21, 2015 and expiring May 1, 2018.

SHELL OIL DEER PARK, Deer Park, Texas: Individual permit TX0004863, held by SHELL CHEMICAL LP; Administratively continued (past its expiration date and still in force until reissued); issued December 21, 2015, term to May 1, 2018; discharges to PATRICK BAYOU TIDAL PORTION OF HOUS.

  • Enterococci: 6 limits, 67 violations of any kind, 59 effluent exceedances, latest July 31, 2026, largest 9,578% over the limit.
  • Calcium, dissolved [as Ca]: 6 limits, 40 violations of any kind, 24 effluent exceedances, latest June 30, 2025, largest 217% over the limit.
  • Nickel, total [as Ni]: 22 limits, 41 violations of any kind, 23 effluent exceedances, latest July 31, 2021, largest 122% over the limit.
  • Zinc, total [as Zn]: 16 limits, 52 violations of any kind, 20 effluent exceedances, latest June 30, 2026, largest 850% over the limit.
  • Coliform, fecal general: 0 limits, 26 violations of any kind, 19 effluent exceedances, latest June 30, 2008, largest 99,999% over the limit.
  • Nitrogen, ammonia total [as N]: 8 limits, 27 violations of any kind, 11 effluent exceedances, latest February 28, 2025, largest 169% over the limit.
  • BOD, 5-day, 20 deg. C: 10 limits, 37 violations of any kind, 9 effluent exceedances, latest February 28, 2026, largest 214% over the limit.
  • Solids, total suspended: 8 limits, 24 violations of any kind, 8 effluent exceedances, latest February 28, 2021, largest 98% over the limit.
  • Copper, total [as Cu]: 16 limits, 23 violations of any kind, 7 effluent exceedances, latest February 28, 2018, largest 335% over the limit.
  • pH: 12 limits, 66 violations of any kind, 5 effluent exceedances, latest November 30, 2024.
  • Oil & Grease: 11 limits, 4 violations of any kind, 2 effluent exceedances, latest March 31, 2023, largest 64% over the limit.
  • Temperature, water deg. fahrenheit: 3 limits, 29 violations of any kind, 1 effluent exceedance, latest June 30, 2011, largest 2% over the limit.
  • Carbon, tot organic [TOC]: 13 limits, 21 violations of any kind, 1 effluent exceedance, latest May 31, 2015, largest 20% over the limit.
  • Flow, in conduit or thru treatment plant: 16 limits, 24 violations of any kind, 0 effluent exceedances.
  • Lead, total [as Pb]: 8 limits, 18 violations of any kind, 0 effluent exceedances.
  • Phenanthrene: 16 limits, 14 violations of any kind, 0 effluent exceedances.
  • Hexachlorobenzene: 12 limits, 14 violations of any kind, 0 effluent exceedances.
  • Chromium, total [as Cr]: 6 limits, 14 violations of any kind, 0 effluent exceedances.
  • Toluene: 8 limits, 12 violations of any kind, 0 effluent exceedances.
  • Benzene: 8 limits, 12 violations of any kind, 0 effluent exceedances.
  • Fluoranthene: 8 limits, 12 violations of any kind, 0 effluent exceedances.
  • 1,3-Dichlorobenzene: 8 limits, 12 violations of any kind, 0 effluent exceedances.
  • Carbon tetrachloride: 14 limits, 10 violations of any kind, 0 effluent exceedances.
  • Acrylonitrile: 14 limits, 10 violations of any kind, 0 effluent exceedances.
  • Hexachloroethane: 14 limits, 10 violations of any kind, 0 effluent exceedances.
  • Tetrachloroethylene: 14 limits, 10 violations of any kind, 0 effluent exceedances.
  • 1,2-Dichloropropane: 14 limits, 10 violations of any kind, 0 effluent exceedances.
  • Vinyl chloride: 14 limits, 10 violations of any kind, 0 effluent exceedances.
  • Benzo[a]pyrene: 12 limits, 10 violations of any kind, 0 effluent exceedances.
  • Di[2-ethylhexyl] phthalate [DEHP]: 12 limits, 10 violations of any kind, 0 effluent exceedances.
  • Benzo[a]anthracene: 10 limits, 10 violations of any kind, 0 effluent exceedances.
  • 1,2-Dichloroethane: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • Chloroform: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • Acenaphthylene: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • Acenaphthene: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • Anthracene: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • Benzo[k]fluoranthene: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • Chlorobenzene: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • Chrysene: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • Diethyl phthalate: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • Dimethyl phthalate: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • Ethylbenzene: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • Fluorene: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • Hexachlorobutadiene: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • Methyl chloride [Chloromethane]: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • Methylene chloride: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • Nitrobenzene: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • Pyrene: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • 1,1-Dichloroethane: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • 1,1-Dichloroethylene: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • 1,1,1-Trichloroethane: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • 1,1,2-Trichloroethane: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • 1,2-Dichlorobenzene: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • trans-1,2-Dichloroethylene: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • 1,2,4-Trichlorobenzene: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • 1,4-Dichlorobenzene: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • 2-Chlorophenol: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • 2-Nitrophenol: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • 2,4-Dichlorophenol: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • 2,4-Dimethylphenol: 8 limits, 10 violations of any kind, 0 effluent exceedances.
  • July 7, 2026: State CWA Penalty AO (State), $102,716 state or local penalty.
  • July 28, 2023: Permit Violations - Violation Specified in Comment (ST6).
  • November 16, 2022: Permit Violations - Violation Specified in Comment (ST6).

SHELL OIL DEER PARK among its neighbors

EPA’s permit file holds 301 discharge permits in the Vince Bayou-Buffalo Bayou subwatershed (HUC 120401040703), TX0004863 among them. Its county holds 4,455, 195 of them major permits; TX0004863 is a major permit.

Other permits in the Vince Bayou-Buffalo Bayou subwatershed (HUC 120401040703)

  • 019-HOU3-22 HOUSTON CONCRETE SILOS, Houston: TXR1594NZ, minor permit, discharging to HOUSTON SHIP CHANNEL/BUFFALO BAYOU TIDAL, permit term to March 4, 2028
  • 1111 FANNIN, Houston: TXR1556LZ, minor permit, permit term to March 4, 2028
  • 225 RAIL YARD, Pasadena: TXR15425W, minor permit, discharging to HOUSTON SHIP CHANNEL/BUFFALO BAYOU TIDAL, permit term to March 4, 2023
  • 500 MAYO SHELL ROAD, Galena Park: TXR05GS62, minor permit, permit term to August 13, 2026
  • 69TH ST WWTP, Houston: TX0096172, major permit, discharging to Buffalo Bayou, permit term to September 1, 2002
  • 8815 MISSISSIPPI, Houston: TXR05GD86, minor permit, permit term to August 13, 2026
  • 8825 MISSISSIPPI STREET, Houston: TXR05GE47, minor permit, permit term to August 13, 2026
  • A AND A METALS, Houston: TXRNEBJ94, minor permit, permit term to August 13, 2026
  • AEI RED BLUFF, Pasadena: TXRNECR17, minor permit, permit term to August 13, 2026
  • AES DEEPWATER COGENERATION PLA, Pasadena: TX0128830, minor permit, discharging to UNNAMED DITCH, VINCE BAYOU TIDAL PO, permit term to September 1, 2017

Identity

Facility as filedSHELL OIL DEER PARK
Permittee as filedSHELL CHEMICAL LP
NPDES IDTX0004863
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMajor discharger
Facility typeNot a publicly owned treatment works
IssuedDecember 21, 2015
Expiration dateMay 1, 2018
AddressDeer Park, TX 77536
Receiving waterPATRICK BAYOU TIDAL PORTION OF HOUS
Receiving water impaired303(D) Listed
SubwatershedVince Bayou-Buffalo Bayou (HUC 120401040703)
SIC2821 – Plastics Materials And Resins
Other EPA IDs (FRS)RCRA handler TXD067285973; ICIS-AIR source TX0000004820100039

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 98 are shown.

Pollutant or measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
Enterococci66759July 31, 20269,578% over the limit
Calcium, dissolved [as Ca]64024June 30, 2025217% over the limit
Nickel, total [as Ni]224123July 31, 2021122% over the limit
Zinc, total [as Zn]165220June 30, 2026850% over the limit
Coliform, fecal general02619June 30, 200899,999% over the limit
Nitrogen, ammonia total [as N]82711February 28, 2025169% over the limit
BOD, 5-day, 20 deg. C10379February 28, 2026214% over the limit
Solids, total suspended8248February 28, 202198% over the limit
Copper, total [as Cu]16237February 28, 2018335% over the limit
pH12665November 30, 2024
Oil & Grease1142March 31, 202364% over the limit
Temperature, water deg. fahrenheit3291June 30, 20112% over the limit
Carbon, tot organic [TOC]13211May 31, 201520% over the limit
Flow, in conduit or thru treatment plant16240
Lead, total [as Pb]8180
Phenanthrene16140
Hexachlorobenzene12140
Chromium, total [as Cr]6140
Toluene8120
Benzene8120
Fluoranthene8120
1,3-Dichlorobenzene8120
Carbon tetrachloride14100
Acrylonitrile14100
Hexachloroethane14100
Tetrachloroethylene14100
1,2-Dichloropropane14100
Vinyl chloride14100
Benzo[a]pyrene12100
Di[2-ethylhexyl] phthalate [DEHP]12100
Benzo[a]anthracene10100
1,2-Dichloroethane8100
Chloroform8100
Acenaphthylene8100
Acenaphthene8100
Anthracene8100
Benzo[k]fluoranthene8100
Chlorobenzene8100
Chrysene8100
Diethyl phthalate8100
Dimethyl phthalate8100
Ethylbenzene8100
Fluorene8100
Hexachlorobutadiene8100
Methyl chloride [Chloromethane]8100
Methylene chloride8100
Nitrobenzene8100
Pyrene8100
1,1-Dichloroethane8100
1,1-Dichloroethylene8100
1,1,1-Trichloroethane8100
1,1,2-Trichloroethane8100
1,2-Dichlorobenzene8100
trans-1,2-Dichloroethylene8100
1,2,4-Trichlorobenzene8100
1,4-Dichlorobenzene8100
2-Chlorophenol8100
2-Nitrophenol8100
2,4-Dichlorophenol8100
2,4-Dimethylphenol8100

Inspections, violations and enforcement

DateWhat EPA recordedAgency
July 28, 2023Permit Violations - Violation Specified in CommentST6
November 16, 2022Permit Violations - Violation Specified in CommentST6

Inspections

EPA’s inspection file holds no inspection for NPDES TX0004863.

Formal enforcement and penalties

1 formal actions, 1 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.

DateWhat EPA recordedAgencyFederal penaltyState or local penalty
July 7, 2026State CWA Penalty AOState$102,716

Informal enforcement

EPA’s informal enforcement file holds no action for NPDES TX0004863.

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, TX0004863.

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

Nearby on the register

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

What this page shows

This EPA-derived public-records page covers Clean Water Act NPDES permit TX0004863 for SHELL OIL DEER PARK in Deer Park, TX, held by SHELL CHEMICAL LP, which discharges to Patrick Bayou Tidal Portion Of Hous within the Vince Bayou-Buffalo Bayou watershed (HUC 120401040703). The page lists the permit as administratively continued and a Major Discharger, with 13 pollutants under a numeric limit and 13 pollutants with an effluent exceedance, and it gives the permit's issue date of December 21, 2015 and expiration date of May 1, 2018.