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Exxon Mobil Corporation - Baton Rouge Polyolefins Plant

Plastics Materials And Resins, major discharger, Baton Rouge, Louisiana. NPDES permit LA0005479, in force until Apr 30, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (12 values), outfall 001 form B twice a year, outfall 001 form CE quarterly, outfall 001 form PI quarterly, outfall 001 form Q quarterly, outfall 001 form S twice a year, and 2 more forms
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 1 of 35 reports late

Limits in force (176)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cmonthly average≤ 505 lb/dall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 1331 lb/dall year001
pHinstantaneous minimumreport only (SU)all year001
pHinstantaneous maximumreport only (SU)all year001
Solids, total suspendedmonthly average≤ 1124 lb/dall year001
Solids, total suspendeddaily maximum≤ 3632 lb/dall year001
Oil & Greasemonthly average≤ 10 mg/Lall year001
Oil & Greasedaily maximum≤ 15 mg/Lall year001
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year001
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year001
Chromium, hexavalent [as Cr]monthly averagereport only (ug/L)all year001
Chromium, hexavalent [as Cr]daily maximumreport only (ug/L)all year001
Chromium, total [as Cr]monthly average≤ 14.67 lb/dall year001
Chromium, total [as Cr]monthly average≤ 14.67 lb/dall year001
Chromium, total [as Cr]daily maximum≤ 36.6 lb/dall year001
Chromium, total [as Cr]daily maximum≤ 36.6 lb/dall year001
Zinc, total [as Zn]monthly average≤ 13.87 lb/dall year001
Zinc, total [as Zn]monthly average≤ 13.87 lb/dall year001
Zinc, total [as Zn]daily maximum≤ 34.49 lb/dall year001
Zinc, total [as Zn]daily maximum≤ 34.49 lb/dall year001
Whole effluent toxicity - retest #1monthly average minimumreport only (pass=0;fail=1)all year001
Whole effluent toxicity - retest #1monthly average minimumreport only (pass=0;fail=1)all year001
Whole effluent toxicity - retest #17-day minimumreport only (pass=0;fail=1)all year001
Whole effluent toxicity - retest #17-day minimumreport only (pass=0;fail=1)all year001
Whole effluent toxicity - retest #2monthly average minimumreport only (pass=0;fail=1)all year001
Whole effluent toxicity - retest #2monthly average minimumreport only (pass=0;fail=1)all year001
Whole effluent toxicity - retest #27-day minimumreport only (pass=0;fail=1)all year001
Whole effluent toxicity - retest #27-day minimumreport only (pass=0;fail=1)all year001
WET, sublethal retest #1monthly average minimumreport only (pass=0;fail=1)all year001
WET, sublethal retest #1monthly average minimumreport only (pass=0;fail=1)all year001
WET, sublethal retest #17-day minimumreport only (pass=0;fail=1)all year001
WET, sublethal retest #17-day minimumreport only (pass=0;fail=1)all year001
WET, sublethal retest #2monthly average minimumreport only (pass=0;fail=1)all year001
WET, sublethal retest #2monthly average minimumreport only (pass=0;fail=1)all year001
WET, sublethal retest #27-day minimumreport only (pass=0;fail=1)all year001
WET, sublethal retest #27-day minimumreport only (pass=0;fail=1)all year001
Carbon tetrachloridemonthly average≤ .23 lb/dall year001
Carbon tetrachloridedaily maximum≤ .56 lb/dall year001
1,2-Dichloroethanemonthly average≤ 1.33 lb/dall year001
1,2-Dichloroethanedaily maximum≤ 3.16 lb/dall year001
Chloroformmonthly average≤ 1.47 lb/dall year001
Chloroformdaily maximum≤ 4.29 lb/dall year001
Toluenemonthly average≤ .37 lb/dall year001
Toluenedaily maximum≤ .98 lb/dall year001
Benzenemonthly average≤ .75 lb/dall year001
Benzenedaily maximum≤ 1.77 lb/dall year001
Acenaphthylenemonthly average≤ .25 lb/dall year001
Acenaphthylenedaily maximum≤ .62 lb/dall year001
Acenaphthenemonthly average≤ .25 lb/dall year001
Acenaphthenedaily maximum≤ .62 lb/dall year001
Acrylonitrileaverage≤ 1.24 lb/dall year001
Acrylonitrilemaximum≤ 3.07 lb/dall year001
Anthracenemonthly average≤ .25 lb/dall year001
Anthracenedaily maximum≤ .62 lb/dall year001
Benzo[b]fluoranthenemonthly average≤ .26 lb/dall year001
Benzo[b]fluoranthenedaily maximum≤ .63 lb/dall year001
Benzo[k]fluoranthenemonthly average≤ .25 lb/dall year001
Benzo[k]fluoranthenedaily maximum≤ .62 lb/dall year001
Benzo[a]pyrenemonthly average≤ .26 lb/dall year001
Benzo[a]pyrenedaily maximum≤ .63 lb/dall year001
Chlorobenzenemonthly average≤ 1.88 lb/dall year001
Chlorobenzenedaily maximum≤ 5.02 lb/dall year001
Chrysenemonthly average≤ .25 lb/dall year001
Chrysenedaily maximum≤ .62 lb/dall year001
Diethyl phthalatemonthly average≤ .61 lb/dall year001
Diethyl phthalatedaily maximum≤ 1.49 lb/dall year001
Dimethyl phthalatemonthly average≤ .25 lb/dall year001
Dimethyl phthalatedaily maximum≤ .62 lb/dall year001
Ethylbenzenemonthly average≤ 1.88 lb/dall year001
Ethylbenzenedaily maximum≤ 5.02 lb/dall year001
Fluoranthenemonthly average≤ .29 lb/dall year001
Fluoranthenedaily maximum≤ .71 lb/dall year001
Fluorenemonthly average≤ .25 lb/dall year001
Fluorenedaily maximum≤ .62 lb/dall year001
Hexachlorobutadienemonthly average≤ .02 lb/dall year001
Hexachlorobutadienedaily maximum≤ .05 lb/dall year001
Hexachloroethanemonthly average≤ 2.59 lb/dall year001
Hexachloroethanedaily maximum≤ 10.49 lb/dall year001
Methyl chloride [Chloromethane]monthly average≤ 1.45 lb/dall year001
Methyl chloride [Chloromethane]daily maximum≤ 3.9 lb/dall year001
Methylene chloridemonthly average≤ .48 lb/dall year001
Methylene chloridedaily maximum≤ 2.25 lb/dall year001
Nitrobenzenemonthly average≤ 29.56 lb/dall year001
Nitrobenzenedaily maximum≤ 84.59 lb/dall year001
Phenanthrenemonthly average≤ .25 lb/dall year001
Phenanthrenedaily maximum≤ .62 lb/dall year001
Pyrenemonthly average≤ .26 lb/dall year001
Pyrenedaily maximum≤ .63 lb/dall year001
Tetrachloroethylenemonthly average≤ .49 lb/dall year001
Tetrachloroethylenedaily maximum≤ 1.16 lb/dall year001
1,1-Dichloroethanemonthly average≤ .29 lb/dall year001
1,1-Dichloroethanedaily maximum≤ .78 lb/dall year001
1,1-Dichloroethylenemonthly average≤ .11 lb/dall year001
1,1-Dichloroethylenedaily maximum≤ .27 lb/dall year001
1,1,1-Trichloroethanemonthly average≤ .29 lb/dall year001
1,1,1-Trichloroethanedaily maximum≤ .78 lb/dall year001
1,1,2-Trichloroethanemonthly average≤ .42 lb/dall year001
1,1,2-Trichloroethanedaily maximum≤ 1.68 lb/dall year001
Benzo[a]anthracenemonthly average≤ .25 lb/dall year001
Benzo[a]anthracenedaily maximum≤ .62 lb/dall year001
1,2-Dichlorobenzenemonthly average≤ 2.59 lb/dall year001
1,2-Dichlorobenzenedaily maximum≤ 10.49 lb/dall year001
1,2-Dichloropropanemonthly average≤ 2.59 lb/dall year001
1,2-Dichloropropanedaily maximum≤ 10.49 lb/dall year001
trans-1,2-Dichloroethylenemonthly average≤ .33 lb/dall year001
trans-1,2-Dichloroethylenedaily maximum≤ .87 lb/dall year001
1,2,4-Trichlorobenzenemonthly average≤ 2.59 lb/dall year001
1,2,4-Trichlorobenzenedaily maximum≤ 10.49 lb/dall year001
1,3-Dichlorobenzenemonthly average≤ 1.88 lb/dall year001
1,3-Dichlorobenzenedaily maximum≤ 5.02 lb/dall year001
1,4-Dichlorobenzenemonthly average≤ 1.88 lb/dall year001
1,4-Dichlorobenzenedaily maximum≤ 5.02 lb/dall year001
2-Nitrophenolmonthly average≤ .86 lb/dall year001
2-Nitrophenoldaily maximum≤ 3.05 lb/dall year001
2,4-Dimethylphenolmonthly average≤ .25 lb/dall year001
2,4-Dimethylphenoldaily maximum≤ .62 lb/dall year001
2,4-Dinitrophenolmonthly average≤ 15.95 lb/dall year001
2,4-Dinitrophenoldaily maximum≤ 56.7 lb/dall year001
4-Nitrophenolmonthly average≤ 2.14 lb/dall year001
4-Nitrophenoldaily maximum≤ 7.61 lb/dall year001
4,6-Dinitro-o-cresolmonthly average≤ 1.03 lb/dall year001
4,6-Dinitro-o-cresoldaily maximum≤ 3.66 lb/dall year001
Phenolmonthly average≤ .25 lb/dall year001
Phenoldaily maximum≤ .62 lb/dall year001
Naphthalenemonthly average≤ .25 lb/dall year001
Naphthalenedaily maximum≤ .62 lb/dall year001
Di[2-ethylhexyl] phthalate [DEHP]monthly average≤ 1.26 lb/dall year001
Di[2-ethylhexyl] phthalate [DEHP]daily maximum≤ 3.41 lb/dall year001
Di-n-butyl phthalatemonthly average≤ .26 lb/dall year001
Di-n-butyl phthalatedaily maximum≤ .57 lb/dall year001
Vinyl chloridemonthly average≤ .09 lb/dall year001
Vinyl chloridedaily maximum≤ .21 lb/dall year001
Trichloroethylenemonthly average≤ .34 lb/dall year001
Trichloroethylenedaily maximum≤ .91 lb/dall year001
Hexachlorobenzenemonthly average≤ .00005 lb/dall year001
Hexachlorobenzenedaily maximum≤ .00012 lb/dall 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
1,3-Dichloropropylenemonthly average≤ 1.08 lb/dall year001
1,3-Dichloropropylenedaily maximum≤ 2.56 lb/dall year001
Whole Effluent Toxicity - Retest #3monthly average minimumreport only (pass=0;fail=1)all year001
Whole Effluent Toxicity - Retest #3monthly average minimumreport only (pass=0;fail=1)all year001
Whole Effluent Toxicity - Retest #37-day minimumreport only (pass=0;fail=1)all year001
Whole Effluent Toxicity - Retest #37-day minimumreport only (pass=0;fail=1)all year001
Whole Effluent Toxicity, Sub-Lethal Retest #3monthly average minimumreport only (pass=0;fail=1)all year001
Whole Effluent Toxicity, Sub-Lethal Retest #3monthly average minimumreport only (pass=0;fail=1)all year001
Whole Effluent Toxicity, Sub-Lethal Retest #37-day minimumreport only (pass=0;fail=1)all year001
Whole Effluent Toxicity, Sub-Lethal Retest #37-day minimumreport only (pass=0;fail=1)all year001
pH range excursions, > 60 minutesmonthly total≤ 0 occur/moall year001
pH range excursions, monthly total accummonthly total≤ 446 minall year001
Chloroethanemonthly average≤ 1.45 lb/dall year001
Chloroethanedaily maximum≤ 3.9 lb/dall year001
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all year001
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all year001
Pass/Fail Static Renewal 7Day Chronic Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all year001
Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all year001
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all year001
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all year001
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all year001
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all year001
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all year001
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all year001
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all year001
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all year001
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all year001
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all year001
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all year001
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all year001
Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubiamaximumreport only (%)all year001
Coef Of Var Static Renewal 7Day Chronic Pimephales promelasmaximumreport only (%)all year001
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

How strict are these limits?

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

Same industry: the 130 Chemicals and Allied Products permits in Louisiana.

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