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Marathon Petroleum Company LP - Louisiana Refining Division

Petroleum Refining, major discharger, Garyville, Louisiana. NPDES permit LA0045683 expired Oct 31, 2025; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (4 values), outfall 002 form Q quarterly (6 values), outfall 003 form Q quarterly (6 values), outfall 004 form Q quarterly (6 values), outfall 005 form Q quarterly (6 values), outfall 006 form Q quarterly (6 values), and 26 more forms
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 236 reports late

Limits in force (250)

ParameterStatisticLimitMonthsOutfall
pHinstantaneous minimum≥ 6 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulexmonthly average minimumreport only (pass=0;fail=1)all year001
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex48-hour minimumreport only (pass=0;fail=1)all year001
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all year001
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas48-hour minimumreport only (pass=0;fail=1)all year001
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulexmonthly average minimumreport only (%)all year001
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex48-hour minimumreport only (%)all year001
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelasmonthly average minimumreport only (%)all year001
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas48-hour minimumreport only (%)all year001
Coef Of Var Static Renewal 48Hr Acute D. pulexmaximumreport only (%)all year001
Coef Of Var Static Renewal 48Hr Acute Pimephales promelasmaximumreport only (%)all year001
pHinstantaneous minimum≥ 6 SUall year002
pHinstantaneous maximum≤ 9 SUall year002
Oil & Greasedaily maximum≤ 15 mg/Lall year002
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
pHinstantaneous minimum≥ 6 SUall year003
pHinstantaneous maximum≤ 9 SUall year003
Oil & Greasedaily maximum≤ 15 mg/Lall year003
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year003
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year003
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year003
pHinstantaneous minimum≥ 6 SUall year004
pHinstantaneous maximum≤ 9 SUall year004
Oil & Greasedaily maximum≤ 15 mg/Lall year004
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year004
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year004
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year004
pHinstantaneous minimum≥ 6 SUall year005
pHinstantaneous maximum≤ 9 SUall year005
Oil & Greasedaily maximum≤ 15 mg/Lall year005
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year005
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year005
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year005
pHinstantaneous minimum≥ 6 SUall year006
pHinstantaneous maximum≤ 9 SUall year006
Oil & Greasedaily maximum≤ 15 mg/Lall year006
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year006
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year006
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year006
pHinstantaneous minimum≥ 6 SUall year007
pHinstantaneous maximum≤ 9 SUall year007
Oil & Greasedaily maximum≤ 15 mg/Lall year007
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year007
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year007
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year007
pHinstantaneous minimum≥ 6 SUall year008
pHinstantaneous maximum≤ 9 SUall year008
Oil & Greasedaily maximum≤ 15 mg/Lall year008
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year008
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year008
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year008
pHinstantaneous minimum≥ 6 SUall year011
pHinstantaneous minimum≥ 6 SUall year011
pHinstantaneous maximum≤ 9 SUall year011
pHinstantaneous maximum≤ 9 SUall year011
Solids, total suspendeddaily maximum≤ 90 mg/Lall year011
Solids, total suspendeddaily maximum≤ 90 mg/Lall year011
Solids, total suspendeddaily maximum≤ 90 mg/Lall year011
Solids, total suspendeddaily maximum≤ 90 mg/Lall year011
Oil & Greasedaily maximum≤ 15 mg/Lall year011
Oil & Greasedaily maximum≤ 15 mg/Lall year011
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year011
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year011
Lead, total [as Pb]daily maximum≤ 50 ug/Lall year011
Lead, total [as Pb]daily maximum≤ 50 ug/Lall year011
Benzenedaily maximum≤ 50 ug/Lall year011
Benzenedaily maximum≤ 50 ug/Lall year011
BTEXdaily maximum≤ 250 ug/Lall year011
BTEXdaily maximum≤ 250 ug/Lall year011
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year011
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year011
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year011
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year011
pHinstantaneous minimum≥ 6 SUall year012
pHinstantaneous maximum≤ 9 SUall year012
Oil & Greasedaily maximum≤ 15 mg/Lall year012
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year012
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year012
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year012
pHinstantaneous minimum≥ 6 SUall year013
pHinstantaneous maximum≤ 9 SUall year013
Oil & Greasedaily maximum≤ 15 mg/Lall year013
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year013
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year013
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year013
pHinstantaneous minimum≥ 6 SUall year04A
pHinstantaneous maximum≤ 9 SUall year04A
Oil & Greasedaily maximum≤ 15 mg/Lall year04A
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year04A
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year04A
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year04A
pHinstantaneous minimum≥ 6 SUall year04B
pHinstantaneous maximum≤ 9 SUall year04B
Oil & Greasedaily maximum≤ 15 mg/Lall year04B
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year04B
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year04B
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year04B
BOD, 5-day, 20 deg. Cmonthly average≤ 3969 lb/dall year101
BOD, 5-day, 20 deg. Cdaily maximum≤ 7238 lb/dall year101
Oxygen demand, chem. [high level] [COD]monthly average≤ 27447 lb/dall year101
Oxygen demand, chem. [high level] [COD]daily maximum≤ 53343 lb/dall year101
pHminimumreport only (SU)all year101
pHmaximumreport only (SU)all year101
Solids, total suspendedmonthly average≤ 3197 lb/dall year101
Solids, total suspendeddaily maximum≤ 5084 lb/dall year101
Oil & Greasemonthly average≤ 1178 lb/dall year101
Oil & Greasedaily maximum≤ 2188 lb/dall year101
Nitrogen, total [as N]monthly averagereport only (lb/d)all year101
Nitrogen, total [as N]daily maximumreport only (lb/d)all year101
Nitrogen, ammonia total [as N]monthly average≤ 2561 lb/dall year101
Nitrogen, ammonia total [as N]daily maximum≤ 5632 lb/dall year101
Phosphorus, total [as P]monthly averagereport only (lb/d)all year101
Phosphorus, total [as P]daily maximumreport only (lb/d)all year101
Sulfide, total [as S]monthly average≤ 20.5 lb/dall year101
Sulfide, total [as S]daily maximum≤ 45.6 lb/dall year101
Chromium, hexavalent [as Cr]monthly average≤ 3.5 lb/dall year101
Chromium, hexavalent [as Cr]daily maximum≤ 7.9 lb/dall year101
Chromium, total [as Cr]monthly average≤ 45.8 lb/dall year101
Chromium, total [as Cr]daily maximum≤ 106.8 lb/dall year101
Phenolics, total recoverablemonthly average≤ 25.7 lb/dall year101
Phenolics, total recoverabledaily maximum≤ 53.1 lb/dall year101
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year101
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year101
pH range excursions, > 60 minutesmonthly total≤ 0 occur/moall year101
pH range excursions, monthly total accummonthly total≤ 446 minall year101
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year201
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year201
Carbon tetrachloridemonthly average≤ .05 lb/dall year301
Carbon tetrachloridedaily maximum≤ .12 lb/dall year301
1,2-Dichloroethanemonthly average≤ .06 lb/dall year301
1,2-Dichloroethanedaily maximum≤ .19 lb/dall year301
Chloroformmonthly average≤ .04 lb/dall year301
Chloroformdaily maximum≤ .11 lb/dall year301
Toluenemonthly average≤ .01 lb/dall year301
Toluenedaily maximum≤ .02 lb/dall year301
Benzenemonthly average≤ .02 lb/dall year301
Benzenedaily maximum≤ .04 lb/dall year301
Acenaphthylenemonthly average≤ .01 lb/dall year301
Acenaphthylenedaily maximum≤ .02 lb/dall year301
Acenaphthenemonthly average≤ .01 lb/dall year301
Acenaphthenedaily maximum≤ .02 lb/dall year301
Acrylonitrilemonthly average≤ .03 lb/dall year301
Acrylonitriledaily maximum≤ .08 lb/dall year301
Anthracenemonthly average≤ .01 lb/dall year301
Anthracenedaily maximum≤ .02 lb/dall year301
Benzo[b]fluoranthenemonthly average≤ .01 lb/dall year301
Benzo[b]fluoranthenedaily maximum≤ .02 lb/dall year301
Benzo[k]fluoranthenemonthly average≤ .01 lb/dall year301
Benzo[k]fluoranthenedaily maximum≤ .02 lb/dall year301
Benzo[a]pyrenemonthly average≤ .01 lb/dall year301
Benzo[a]pyrenedaily maximum≤ .02 lb/dall year301
Chlorobenzenemonthly average≤ .05 lb/dall year301
Chlorobenzenedaily maximum≤ .12 lb/dall year301
Chrysenemonthly average≤ .01 lb/dall year301
Chrysenedaily maximum≤ .02 lb/dall year301
Diethyl phthalatemonthly average≤ .01 lb/dall year301
Diethyl phthalatedaily maximum≤ .04 lb/dall year301
Dimethyl phthalatemonthly average≤ .01 lb/dall year301
Dimethyl phthalatedaily maximum≤ .02 lb/dall year301
Ethylbenzenemonthly average≤ .05 lb/dall year301
Ethylbenzenedaily maximum≤ .12 lb/dall year301
Fluoranthenemonthly average≤ .01 lb/dall year301
Fluoranthenedaily maximum≤ .02 lb/dall year301
Fluorenemonthly average≤ .01 lb/dall year301
Fluorenedaily maximum≤ .02 lb/dall year301
Hexachlorobutadienemonthly average≤ .05 lb/dall year301
Hexachlorobutadienedaily maximum≤ .12 lb/dall year301
Hexachloroethanemonthly average≤ .06 lb/dall year301
Hexachloroethanedaily maximum≤ .26 lb/dall year301
Methyl chloride [Chloromethane]monthly average≤ .04 lb/dall year301
Methyl chloride [Chloromethane]daily maximum≤ .1 lb/dall year301
Methylene chloridemonthly average≤ .01 lb/dall year301
Methylene chloridedaily maximum≤ .06 lb/dall year301
Nitrobenzenemonthly average≤ .73 lb/dall year301
Nitrobenzenedaily maximum≤ 2.08 lb/dall year301
Phenanthrenemonthly average≤ .01 lb/dall year301
Phenanthrenedaily maximum≤ .02 lb/dall year301
Pyrenemonthly average≤ .01 lb/dall year301
Pyrenedaily maximum≤ .02 lb/dall year301
Tetrachloroethylenemonthly average≤ .02 lb/dall year301
Tetrachloroethylenedaily maximum≤ .05 lb/dall year301
1,1-Dichloroethanemonthly average≤ .01 lb/dall year301
1,1-Dichloroethanedaily maximum≤ .02 lb/dall year301
1,1-Dichloroethylenemonthly average≤ .01 lb/dall year301
1,1-Dichloroethylenedaily maximum≤ .02 lb/dall year301
1,1,1-Trichloroethanemonthly average≤ .01 lb/dall year301
1,1,1-Trichloroethanedaily maximum≤ .02 lb/dall year301
1,1,2-Trichloroethanemonthly average≤ .01 lb/dall year301
1,1,2-Trichloroethanedaily maximum≤ .04 lb/dall year301
Benzo[a]anthracenemonthly average≤ .01 lb/dall year301
Benzo[a]anthracenedaily maximum≤ .02 lb/dall year301
1,2-Dichlorobenzenemonthly average≤ .06 lb/dall year301
1,2-Dichlorobenzenedaily maximum≤ .26 lb/dall year301
1,2-Dichloropropanemonthly average≤ .06 lb/dall year301
1,2-Dichloropropanedaily maximum≤ .26 lb/dall year301
trans-1,2-Dichloroethylenemonthly average≤ .01 lb/dall year301
trans-1,2-Dichloroethylenedaily maximum≤ .02 lb/dall year301
1,2,4-Trichlorobenzenemonthly average≤ .06 lb/dall year301
1,2,4-Trichlorobenzenedaily maximum≤ .26 lb/dall year301
1,3-Dichlorobenzenemonthly average≤ .05 lb/dall year301
1,3-Dichlorobenzenedaily maximum≤ .12 lb/dall year301
1,4-Dichlorobenzenemonthly average≤ .05 lb/dall year301
1,4-Dichlorobenzenedaily maximum≤ .12 lb/dall year301
2-Nitrophenolmonthly average≤ .02 lb/dall year301
2-Nitrophenoldaily maximum≤ .08 lb/dall year301
2,4-Dimethylphenolmonthly average≤ .01 lb/dall year301
2,4-Dimethylphenoldaily maximum≤ .02 lb/dall year301
2,4-Dinitrophenolmonthly average≤ .39 lb/dall year301
2,4-Dinitrophenoldaily maximum≤ 1.4 lb/dall year301
4-Nitrophenolmonthly average≤ .05 lb/dall year301
4-Nitrophenoldaily maximum≤ .19 lb/dall year301
4,6-Dinitro-o-cresolmonthly average≤ .03 lb/dall year301
4,6-Dinitro-o-cresoldaily maximum≤ .09 lb/dall year301
Phenolmonthly average≤ .01 lb/dall year301
Phenoldaily maximum≤ .02 lb/dall year301
Naphthalenemonthly average≤ .01 lb/dall year301
Naphthalenedaily maximum≤ .02 lb/dall year301
Di[2-ethylhexyl] phthalate [DEHP]monthly average≤ .03 lb/dall year301
Di[2-ethylhexyl] phthalate [DEHP]daily maximum≤ .08 lb/dall year301
Di-n-butyl phthalatemonthly average≤ .01 lb/dall year301
Di-n-butyl phthalatedaily maximum≤ .01 lb/dall year301
Vinyl chloridemonthly average≤ .03 lb/dall year301
Vinyl chloridedaily maximum≤ .06 lb/dall year301
Trichloroethylenemonthly average≤ .01 lb/dall year301
Trichloroethylenedaily maximum≤ .02 lb/dall year301
Hexachlorobenzenemonthly average≤ .06 lb/dall year301
Hexachlorobenzenedaily maximum≤ .26 lb/dall year301
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year301
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year301
1,3-Dichloropropylenemonthly average≤ .06 lb/dall year301
1,3-Dichloropropylenedaily maximum≤ .26 lb/dall year301
Chloroethanemonthly average≤ .04 lb/dall year301
Chloroethanedaily maximum≤ .1 lb/dall year301
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year401
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year401
Cycles Of Concentrationmonthly average minimum≥ 3 call yearCT24
Cycles Of Concentrationmonthly average minimum≥ 3 call yearCT25
Cycles Of Concentrationmonthly average minimum≥ 3 call yearCT26
Cycles Of Concentrationmonthly average minimum≥ 2 call yearCT27
Cycles Of Concentrationmonthly average minimum≥ 3 call yearCT28
Cycles Of Concentrationmonthly average minimum≥ 3 call yearCT29
Cycles Of Concentrationmonthly average minimum≥ 3 call yearCT30
Cycles Of Concentrationmonthly average minimum≥ 3 call yearCT31
Cycles Of Concentrationmonthly average minimum≥ 3 call yearCT32
Cycles Of Concentrationmonthly average minimum≥ 3 call yearCT33

How strict are these limits?

Cited limits by parameter: Louisiana's rules and the federal ones.

Same industry: the 26 Petroleum Refining and Related Industries permits in Louisiana.

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