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Clean Water Act discharge permit · NPDES TX0004871

DEER PARK OIL REFINERY WWTP, Deer Park, TX: NPDES TX0004871 discharge permit, effluent exceedances, inspections, penalties

DEER PARK OIL REFINERY WWTP, held by SHELL OIL COMPANY, holds NPDES permit TX0004871, which discharges to Patricks Bayou To Houston Ship Chan. EPA’s file records it issued December 15, 2015 and expiring May 1, 2018. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filedDEER PARK OIL REFINERY WWTP
Permittee as filedSHELL OIL COMPANY
NPDES IDTX0004871
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 15, 2015
Expiration dateMay 1, 2018
AddressDeer Park, TX 77536
Receiving waterPATRICKS BAYOU TO HOUSTON SHIP CHAN
Receiving water impaired303(D) Listed
SubwatershedVince Bayou-Buffalo Bayou (HUC 120401040703)
SIC2911 – Petroleum Refining
Other EPA IDs (FRS)RCRA handler TXD067285973; ICIS-AIR source TX0000004820100039

Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download; cross-program IDs from EPA’s FRS facility-registry crosswalk.

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 93 are shown.

Pollutant or measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
pH163216July 31, 2026
Carbon, tot organic [TOC]102412October 31, 2025143% over the limit
Oil & Grease10175May 31, 202335% over the limit
BOD, 5-day, 20 deg. C4125September 30, 20251,022% over the limit
Enterococci444August 31, 20249,578% over the limit
Sulfide, total [as S]4103February 29, 2012175% over the limit
Phenolics, total recoverable072February 29, 2012481% over the limit
pH range excursions, > 60 minutes132June 30, 201199,999% over the limit
Chromium, hexavalent [as Cr]4101November 30, 200521% over the limit
Solids, total suspended481August 31, 20112% over the limit
Nitrogen, ammonia total [as N]481June 30, 202613% over the limit
Phenols651February 28, 202652% over the limit
Temperature, water deg. fahrenheit121August 31, 20111% over the limit
pH range excursions, monthly total accum121June 30, 201113% over the limit
Copper, total [as Cu]5100
Chromium, total [as Cr]470
Flow, in conduit or thru treatment plant2060
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia menidia420
NOEC Lethal Static Renewal 7 Day Chronic Menidia menidia420
NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia420
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia420
LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia menidia420
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Menidia menidia420
Nickel, total [as Ni]220
Carbon tetrachloride220
Chloroform220
Toluene220
Benzene220
Acenaphthylene220
Acenaphthene220
Acrylonitrile220
Anthracene220
Benzo[b]fluoranthene220
Benzo[k]fluoranthene220
Benzo[a]pyrene220
Chlorobenzene220
Chloroethane, total weight220
Chrysene220
Diethyl phthalate220
Dimethyl phthalate220
Ethylbenzene220
Fluoranthene220
Fluorene220
Hexachlorobutadiene220
Hexachloroethane220
Methyl chloride [Chloromethane]220
Methylene chloride220
Nitrobenzene220
Phenanthrene220
Pyrene220
Tetrachloroethylene220
1,1-Dichloroethane220
1,1-Dichloroethylene220
1,1,1-Trichloroethane220
1,1,2-Trichloroethane220
Benzo[a]anthracene220
1,2-Dichloroethane, total weight220
1,2-Dichlorobenzene220
1,2-Dichloropropane220
trans-1,2-Dichloroethylene220

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
February 20, 2025Permit Violations - Violation Specified in CommentST6
October 6, 2023Permit Violations - Violation Specified in CommentST6
December 8, 2022Permit Violations - Violation Specified in CommentST6

Inspections

EPA’s inspection file holds no inspection for NPDES TX0004871.

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 TX0004871.

Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.

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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 TX0004871 there.

Nearby on the register

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

What this page shows

This EPA permit record covers NPDES permit TX0004871 for the Deer Park Oil Refinery WWTP in Deer Park, TX, held by Shell Oil Company, with an administratively continued status and a Major discharger class. The page lists 91 pollutants under a numeric limit and 14 pollutants with an effluent exceedance, and it shows the permit was issued December 15, 2015 and expired May 1, 2018.