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Exxon Mobil Corporation

Plastics Materials And Resins, major discharger, Mont Belvieu, Texas. NPDES permit TX0089125, in force until Mar 26, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (19 values), outfall 001 form Y yearly, outfall TX1 form Q quarterly, outfall TXA form S twice a year
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 20 reports late

Limits in force (147)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly minimum≥ 5 mg/Lall year001
Oxygen demand, chem. [high level] [COD]daily average≤ 11259 lb/dall year001
Oxygen demand, chem. [high level] [COD]daily maximum≤ 28530 lb/dall year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendeddaily average≤ 1518 lb/dall year001
Solids, total suspendeddaily maximum≤ 4346 lb/dall year001
Oil & Greasedaily average≤ 628 lb/dall year001
Oil & Greasedaily maximum≤ 837 lb/dall year001
Nitrogen, ammonia total [as N]daily average≤ 126 lb/dall year001
Nitrogen, ammonia total [as N]daily maximum≤ 252 lb/dall year001
Sulfate, total [as SO4]daily maximum≤ 475 mg/Lall year001
Sulfate, total [as SO4]daily average≤ 7904 lb/dall year001
Carbon tetrachloridedaily average≤ 3.73 lb/dall year001
Carbon tetrachloridedaily maximum≤ 9.98 lb/dall year001
1,2-Dichloroethanedaily average≤ 4.73 lb/dall year001
1,2-Dichloroethanedaily maximum≤ 15.07 lb/dall year001
Chloroformdaily average≤ 2.91 lb/dall year001
Chloroformdaily maximum≤ 8.53 lb/dall year001
Toluenedaily average≤ .735 lb/dall year001
Toluenedaily maximum≤ 1.94 lb/dall year001
Benzenedaily average≤ 1.5 lb/dall year001
Benzenedaily maximum≤ 3.52 lb/dall year001
Acenaphthylenedaily average≤ .499 lb/dall year001
Acenaphthylenedaily maximum≤ 1.23 lb/dall year001
Acenaphthenedaily average≤ .499 lb/dall year001
Acenaphthenedaily maximum≤ 1.23 lb/dall year001
Acrylonitriledaily average≤ 2.47 lb/dall year001
Acrylonitriledaily maximum≤ 6.09 lb/dall year001
Anthracenedaily average≤ .499 lb/dall year001
Anthracenedaily maximum≤ 1.23 lb/dall year001
Benzo[b]fluoranthenedaily average≤ .525 lb/dall year001
Benzo[b]fluoranthenedaily maximum≤ 1.26 lb/dall year001
Benzo[k]fluoranthenedaily average≤ .499 lb/dall year001
Benzo[k]fluoranthenedaily maximum≤ 1.23 lb/dall year001
Benzo[a]pyrenedaily average≤ .00018 lb/dall year001
Benzo[a]pyrenedaily maximum≤ .0004 lb/dall year001
Chlorobenzenedaily average≤ 3.73 lb/dall year001
Chlorobenzenedaily maximum≤ 9.98 lb/dall year001
Chrysenedaily average≤ .287 lb/dall year001
Chrysenedaily maximum≤ .607 lb/dall year001
Diethyl phthalatedaily average≤ 1.21 lb/dall year001
Diethyl phthalatedaily maximum≤ 2.97 lb/dall year001
Dimethyl phthalatedaily average≤ .499 lb/dall year001
Dimethyl phthalatedaily maximum≤ 1.23 lb/dall year001
Ethylbenzenedaily average≤ 3.73 lb/dall year001
Ethylbenzenedaily maximum≤ 9.98 lb/dall year001
Fluoranthenedaily average≤ .578 lb/dall year001
Fluoranthenedaily maximum≤ 1.42 lb/dall year001
Fluorenedaily average≤ .499 lb/dall year001
Fluorenedaily maximum≤ 1.23 lb/dall year001
Hexachlorobutadienedaily average≤ .0251 lb/dall year001
Hexachlorobutadienedaily maximum≤ .0527 lb/dall year001
Hexachloroethanedaily average≤ .266 lb/dall year001
Hexachloroethanedaily maximum≤ .561 lb/dall year001
Methyl chloride [Chloromethane]daily average≤ 2.89 lb/dall year001
Methyl chloride [Chloromethane]daily maximum≤ 7.74 lb/dall year001
Methylene chloridedaily average≤ .945 lb/dall year001
Methylene chloridedaily maximum≤ 4.46 lb/dall year001
Nitrobenzenedaily average≤ 58.73 lb/dall year001
Nitrobenzenedaily maximum≤ 168.1 lb/dall year001
Phenanthrenedaily average≤ .499 lb/dall year001
Phenanthrenedaily maximum≤ 1.23 lb/dall year001
Pyrenedaily average≤ .525 lb/dall year001
Pyrenedaily maximum≤ 1.26 lb/dall year001
Tetrachloroethylenedaily average≤ 1.37 lb/dall year001
Tetrachloroethylenedaily maximum≤ 4.31 lb/dall year001
1,1-Dichloroethanedaily average≤ .578 lb/dall year001
1,1-Dichloroethanedaily maximum≤ 1.55 lb/dall year001
1,1-Dichloroethylenedaily average≤ .578 lb/dall year001
1,1-Dichloroethylenedaily maximum≤ 1.58 lb/dall year001
1,1,1-Trichloroethanedaily average≤ .578 lb/dall year001
1,1,1-Trichloroethanedaily maximum≤ 1.55 lb/dall year001
1,1,2-Trichloroethanedaily average≤ .84 lb/dall year001
1,1,2-Trichloroethanedaily maximum≤ 3.33 lb/dall year001
Benzo[a]anthracenedaily average≤ .0029 lb/dall year001
Benzo[a]anthracenedaily maximum≤ .006 lb/dall year001
1,2-Dichlorobenzenedaily average≤ 5.15 lb/dall year001
1,2-Dichlorobenzenedaily maximum≤ 20.85 lb/dall year001
1,2-Dichloropropanedaily average≤ 5.15 lb/dall year001
1,2-Dichloropropanedaily maximum≤ 20.85 lb/dall year001
trans-1,2-Dichloroethylenedaily average≤ .656 lb/dall year001
trans-1,2-Dichloroethylenedaily maximum≤ 1.73 lb/dall year001
1,2,4-Trichlorobenzenedaily average≤ 5.15 lb/dall year001
1,2,4-Trichlorobenzenedaily maximum≤ 20.85 lb/dall year001
1,3-Dichlorobenzenedaily average≤ 3.73 lb/dall year001
1,3-Dichlorobenzenedaily maximum≤ 9.98 lb/dall year001
1,4-Dichlorobenzenedaily average≤ 3.73 lb/dall year001
1,4-Dichlorobenzenedaily maximum≤ 9.98 lb/dall year001
2-Nitrophenoldaily average≤ 1.71 lb/dall year001
2-Nitrophenoldaily maximum≤ 6.06 lb/dall year001
2,4-Dimethylphenoldaily average≤ .499 lb/dall year001
2,4-Dimethylphenoldaily maximum≤ 1.23 lb/dall year001
2,4-Dinitrophenoldaily average≤ 31.69 lb/dall year001
2,4-Dinitrophenoldaily maximum≤ 112.7 lb/dall year001
4-Nitrophenoldaily average≤ 4.25 lb/dall year001
4-Nitrophenoldaily maximum≤ 15.12 lb/dall year001
4,6-Dinitro-o-cresoldaily average≤ 2.05 lb/dall year001
4,6-Dinitro-o-cresoldaily maximum≤ 7.27 lb/dall year001
Phenoldaily average≤ .499 lb/dall year001
Phenoldaily maximum≤ 1.23 lb/dall year001
Naphthalenedaily average≤ .499 lb/dall year001
Naphthalenedaily maximum≤ 1.23 lb/dall year001
Di[2-ethylhexyl] phthalate [DEHP]daily average≤ .858 lb/dall year001
Di[2-ethylhexyl] phthalate [DEHP]daily maximum≤ 1.82 lb/dall year001
Di-n-butyl phthalatedaily average≤ .525 lb/dall year001
Di-n-butyl phthalatedaily maximum≤ 1.13 lb/dall year001
Vinyl chloridedaily average≤ 1.88 lb/dall year001
Vinyl chloridedaily maximum≤ 3.98 lb/dall year001
Trichloroethylenedaily average≤ .683 lb/dall year001
Trichloroethylenedaily maximum≤ 1.81 lb/dall year001
Hexachlorobenzenedaily average≤ .00008 lb/dall year001
Hexachlorobenzenedaily maximum≤ .0002 lb/dall year001
Flow, in conduit or thru treatment plantdaily average≤ 5.013 MGDall year001
Flow, in conduit or thru treatment plantdaily maximum≤ 13 MGDall year001
1,3-Dichloropropylenedaily average≤ 5.15 lb/dall year001
1,3-Dichloropropylenedaily maximum≤ 20.85 lb/dall year001
Solids, total dissolveddaily maximum≤ 1418 mg/Lall year001
Solids, total dissolveddaily average≤ 23624 lb/dall year001
3,4-Benzofluoranthenedaily average≤ .525 lb/dall year001
3,4-Benzofluoranthenedaily maximum≤ 1.26 lb/dall year001
BOD, carbonaceous [5 day, 20 C]daily average≤ 393 lb/dall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 996 lb/dall year001
Chloroethanedaily average≤ 2.89 lb/dall year001
Chloroethanedaily maximum≤ 7.74 lb/dall year001
Whole effluent toxicity - retest #17-day minimumreport only (pass=0;fail=1)all yearTX1
Whole effluent toxicity - retest #1monthly average minimumreport only (pass=0;fail=1)all yearTX1
Whole effluent toxicity - retest #27-day minimumreport only (pass=0;fail=1)all yearTX1
Whole effluent toxicity - retest #2monthly average minimumreport only (pass=0;fail=1)all yearTX1
IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all yearTX1
IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all yearTX1
IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all yearTX1
IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all yearTX1
IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all yearTX1
IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all yearTX1
IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all yearTX1
IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all yearTX1
IC25 Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX1
IC25 Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all yearTX1
IC25 Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX1
IC25 Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all yearTX1
IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX1
IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all yearTX1
IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX1
IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all yearTX1
LC50 Pass/Fail Static 24Hr Acute D. Pulexsingle samplereport only (pass=0;fail=1)all yearTXA
LC50 Pass/Fail Static 24Hr Acute Pimephales promelassingle samplereport only (pass=0;fail=1)all yearTXA

How strict are these limits?

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

Same industry: the 165 Chemicals and Allied Products permits in Texas.

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