EXXON MOBIL CORPORATION

NPDES permit TX0006271 · Major NON-POTW · effective, expires 2027-07-12 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

EPA's record, 2025-09-01 to 2026-08-31

0values over a limit
0required values missing, on 0 form(s)
6of 72 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 20 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (111)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheitDAILY AV <= 95 deg F all year
001Temperature, water deg. fahrenheitDAILY MX <= 100 deg F all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedDAILY AV <= 15609 lb/d all year
001Solids, total suspendedDAILY MX <= 25128 lb/d all year
001Oil & GreaseDAILY AV <= 5355 lb/d all year
001Oil & GreaseDAILY MX <= 10115 lb/d all year
001Nitrogen, ammonia total [as N]DAILY AV <= 2515 lb/d all year
001Nitrogen, ammonia total [as N]DAILY MX <= 5030 lb/d all year
001Carbon, tot organic [TOC]DAILY AV <= 37789 lb/d all year
001Carbon, tot organic [TOC]DAILY MX <= 70610 lb/d all year
001Sulfide, total [as S]DAILY AV <= 73.6 lb/d all year
001Sulfide, total [as S]DAILY MX <= 163 lb/d all year
001Chromium, hexavalent [as Cr]DAILY AV <= 10.5 lb/d all year
001Chromium, hexavalent [as Cr]DAILY MX <= 23.6 lb/d all year
001Chromium, total [as Cr]DAILY AV <= 108 lb/d all year
001Chromium, total [as Cr]DAILY MX <= 308 lb/d all year
001Flow, in conduit or thru treatment plantDAILY AV report only all year
001Flow, in conduit or thru treatment plantDAILY MX <= 60 MGD all year
001Phenolic compounds, totalDAILY AV <= 90.7 lb/d all year
001Phenolic compounds, totalDAILY MX <= 233 lb/d all year
001BOD, carbonaceous [5 day, 20 C]DAILY AV <= 9819 lb/d all year
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 19638 lb/d all year
002pHMINIMUM >= 6 SU all year
002pHMAXIMUM <= 9 SU all year
002Oil & GreaseDAILY MX <= 15 mg/L all year
002Carbon, tot organic [TOC]DAILY MX <= 55 mg/L all year
002Zinc, total [as Zn]DAILY MX report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
003Temperature, water deg. fahrenheitDAILY MX <= 107 deg F all year
003pHMINIMUM >= 6 SU all year
003pHMAXIMUM <= 9 SU all year
003Oil & GreaseDAILY MX <= 15 mg/L all year
003Carbon, tot organic [TOC]DAILY MX <= 100 mg/L all year
003Copper, total [as Cu]DAILY AV report only all year
003Copper, total [as Cu]DAILY MX report only all year
003Flow, in conduit or thru treatment plantDAILY AV <= 4 MGD all year
003Flow, in conduit or thru treatment plantDAILY MX <= 5 MGD all year
004pHMINIMUM >= 6 SU all year
004pHMAXIMUM <= 9 SU all year
004Oil & GreaseDAILY MX <= 15 mg/L all year
004Carbon, tot organic [TOC]DAILY MX <= 55 mg/L all year
004Flow, in conduit or thru treatment plantDAILY AV report only all year
004Flow, in conduit or thru treatment plantDAILY MX report only all year
101Flow, in conduit or thru treatment plantDAILY AV report only all year
101Flow, in conduit or thru treatment plantDAILY MX report only all year
101Chlorine, total residualMO MIN >= 1 mg/L all year
101EnterococciDAILY AV <= 35 CFU/100mL all year
101EnterococciDAILY MX <= 104 CFU/100mL all year
102pHMINIMUM >= 6 SU all year
102pHMAXIMUM <= 9 SU all year
102Solids, total suspendedDAILY MX <= 140 mg/L all year
102Solids, total suspendedDAILY MX <= 292434 lb/d all year
102Nitrogen, ammonia total [as N]DAILY MX <= 22.5 mg/L all year
102Nitrogen, ammonia total [as N]DAILY MX <= 47118 lb/d all year
102Carbon, tot organic [TOC]DAILY MX <= 339 mg/L all year
102Carbon, tot organic [TOC]DAILY MX <= 707975 lb/d all year
102Sulfide, total [as S]DAILY MX <= .661 mg/L all year
102Sulfide, total [as S]DAILY MX <= 1379 lb/d all year
102Chromium, hexavalent [as Cr]DAILY MX <= .0943 mg/L all year
102Chromium, hexavalent [as Cr]DAILY MX <= 197 lb/d all year
102Chromium, total [as Cr]DAILY MX <= .969 mg/L all year
102Chromium, total [as Cr]DAILY MX <= 2023 lb/d all year
102Polynuclear Aromatic Hydrocarbons [PAHs]DAILY MX report only all year
102Polynuclear Aromatic Hydrocarbons [PAHs]DAILY MX report only all year
102Benzene, ethylbenzene, toluene, xylene combinationDAILY MX report only all year
102Benzene, ethylbenzene, toluene, xylene combinationDAILY MX report only all year
102BenzeneDAILY MX <= .5 mg/L all year
102BenzeneDAILY MX <= 1043 lb/d all year
102Flow, in conduit or thru treatment plantDAILY MX report only all year
102Phenolic compounds, totalDAILY MX <= .814 mg/L all year
102Phenolic compounds, totalDAILY MX <= 1699 lb/d all year
102BOD, carbonaceous [5 day, 20 C]DAILY MX <= 88.2 mg/L all year
102BOD, carbonaceous [5 day, 20 C]DAILY MX <= 183958 lb/d all year
TX1Whole effluent toxicity - retest #17 DA MIN report only all year
TX1Whole effluent toxicity - retest #17 DA MIN report only all year
TX1Whole effluent toxicity - retest #1MO AV MN report only all year
TX1Whole effluent toxicity - retest #1MO AV MN report only all year
TX1Whole effluent toxicity - retest #27 DA MIN report only all year
TX1Whole effluent toxicity - retest #27 DA MIN report only all year
TX1Whole effluent toxicity - retest #2MO AV MN report only all year
TX1Whole effluent toxicity - retest #2MO AV MN report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)7 DA MIN report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)MO AV MN report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia menidia7 DA MIN report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia menidiaMO AV MN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7 DA MIN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)MO AV MN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Menidia menidia7 DA MIN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Menidia menidiaMO AV MN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7 DA MIN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)MO AV MN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia7 DA MIN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia menidiaMO AV MN report only all year
TX1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7 DA MIN report only all year
TX1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)MO AV MN report only all year
TX1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia7 DA MIN report only all year
TX1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia menidiaMO AV MN report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7 DA MIN report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)MO AV MN report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia menidia7 DA MIN report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia menidiaMO AV MN report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)7 DA MIN report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)MO AV MN report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Menidia menidia7 DA MIN report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Menidia menidiaMO AV MN report only all year
TXAWhole effluent toxicity - retest #1SINGSAMP report only all year
TXAWhole effluent toxicity - retest #2SINGSAMP report only all year
TXALC50 Pass/Fail Static 24Hr Acute Americamysis bahia (formerly Mysidopsis bahia)SINGSAMP report only all year
TXALC50 Pass/Fail Static 24Hr Acute Menidia menidiaSINGSAMP report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states