Clean Water Act discharge permit · NPDES LA0045683

MARATHON PETROLEUM COMPANY LP - LOUISIANA REFINING DIVISION, Garyville, LA: NPDES LA0045683 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MajorDischarger class
77Pollutants under a numeric limit
7Pollutants with an effluent exceedance

MARATHON PETROLEUM COMPANY LP - LOUISIANA REFINING DIVISION, held by Marathon Petroleum Company LP - Louisiana Refining Division, holds NPDES permit LA0045683, which discharges to Mississippi River/Union Canal. EPA’s file records it issued April 22, 2014 and expiring April 30, 2019. 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 filed	MARATHON PETROLEUM COMPANY LP - LOUISIANA REFINING DIVISION
Permittee as filed	Marathon Petroleum Company LP - Louisiana Refining Division
NPDES ID	LA0045683
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Individual permit
Discharger class	Major discharger
Facility type	Not a publicly owned treatment works
Issued	April 22, 2014
Expiration date	April 30, 2019
Address	Garyville, LA 70051
Receiving water	MISSISSIPPI RIVER/UNION CANAL
Receiving water impaired	303(D) Listed
Subwatershed	Claiborne Island (HUC 080701000105)
SIC	2911 – Petroleum Refining
Other EPA IDs (FRS)	RCRA handler LA0000092601; ICIS-AIR source LA0000002209500005

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

78Pollutants on file
77Under a numeric limit
75With a violation of any kind
7With 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; the 60 with the most exceedances of 78 are shown.

Pollutant or measure	Limits	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
Solids, total suspended	3	20	5	November 30, 2023	67% over the limit
Sulfide, total [as S]	2	16	4	February 28, 2018	118% over the limit
Carbon, tot organic [TOC]	12	55	3	June 30, 2010	7% over the limit
pH	28	130	2	February 28, 2018
Oxygen demand, chem. [high level] [COD]	2	13	1	February 28, 2022	48% over the limit
Nitrogen, ammonia total [as N]	2	13	1	February 28, 2022	4% over the limit
Lead, total [as Pb]	1	4	1	December 31, 2006	140% over the limit
Flow, in conduit or thru treatment plant	34	166	0
Oil and grease	14	63	0
BOD, 5-day, 20 deg. C	2	12	0
Phenolics, total recoverable	2	12	0
Benzene	3	10	0
pH range excursions, > 60 minutes	1	9	0
pH range excursions, monthly total accum	1	9	0
1,3-Dichloropropylene	2	8	0
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex	2	8	0
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas	2	8	0
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex	2	8	0
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas	2	8	0
Coef Of Var Static Renewal 48Hr Acute D. pulex	1	7	0
Coef Of Var Static Renewal 48Hr Acute Pimephales promelas	1	7	0
Chromium, hexavalent [as Cr]	2	6	0
Chromium, total [as Cr]	2	6	0
Carbon tetrachloride	2	6	0
1,2-Dichloroethane	2	6	0
Chloroform	2	6	0
Toluene	2	6	0
Acenaphthylene	2	6	0
Acenaphthene	2	6	0
Acrylonitrile	2	6	0
Anthracene	2	6	0
Benzo[b]fluoranthene	2	6	0
Benzo[k]fluoranthene	2	6	0
Benzo[a]pyrene	2	6	0
Chlorobenzene	2	6	0
Chrysene	2	6	0
Diethyl phthalate	2	6	0
Dimethyl phthalate	2	6	0
Ethylbenzene	2	6	0
Fluoranthene	2	6	0
Fluorene	2	6	0
Hexachlorobutadiene	2	6	0
Hexachloroethane	2	6	0
Methyl chloride [Chloromethane]	2	6	0
Methylene chloride	2	6	0
Nitrobenzene	2	6	0
Phenanthrene	2	6	0
Pyrene	2	6	0
Tetrachloroethylene	2	6	0
1,1-Dichloroethane	2	6	0
1,1-Dichloroethylene	2	6	0
1,1,1-Trichloroethane	2	6	0
1,1,2-Trichloroethane	2	6	0
Benzo[a]anthracene	2	6	0
1,2-Dichlorobenzene	2	6	0
1,2-Dichloropropane	2	6	0
trans-1,2-Dichloroethylene	2	6	0
1,2,4-Trichlorobenzene	2	6	0
1,3-Dichlorobenzene	2	6	0
1,4-Dichlorobenzene	2	6	0

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

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES LA0045683.

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

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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 LA0045683 there.

Nearby on the register

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

This public-records page covers Clean Water Act NPDES permit LA0045683, held by Marathon Petroleum Company LP - Louisiana Refining Division in Garyville, LA, which discharges to Mississippi River/Union Canal. The permit is administratively continued and is classed as a Major Discharger, with 77 pollutants under a numeric limit and 7 pollutants with an effluent exceedance.