Exxon Mobil Corporation — NPDES permit TX0077887: limits, due date and EPA's record

Industrial Organic Chemicals, Baytown, Texas. NPDES permit TX0077887 expired Oct 21, 2024; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Limits in force (118)

Parameter	Statistic	Limit	Months	Outfall
pH	minimum	≥ 6 SU	all year	002
pH	maximum	≤ 9 SU	all year	002
Oil & Grease	daily maximum	≤ 15 mg/L	all year	002
Carbon, tot organic [TOC]	daily maximum	≤ 55 mg/L	all year	002
Flow, in conduit or thru treatment plant	daily average	report only (MGD)	all year	002
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	002
BOD, 5-day, 20 deg. C	daily maximum	≤ 80 mg/L	all year	102
Solids, total suspended	daily maximum	≤ 149 mg/L	all year	102
Carbon tetrachloride	daily maximum	≤ .38 mg/L	all year	102
Chloroform	daily maximum	≤ .325 mg/L	all year	102
Toluene	daily maximum	≤ .074 mg/L	all year	102
Benzene	daily maximum	≤ .134 mg/L	all year	102
Acenaphthylene	daily maximum	≤ .047 mg/L	all year	102
Acenaphthene	daily maximum	≤ .047 mg/L	all year	102
Acrylonitrile	daily maximum	≤ .232 mg/L	all year	102
Anthracene	daily maximum	≤ .047 mg/L	all year	102
Benzo[k]fluoranthene	daily maximum	≤ .047 mg/L	all year	102
Benzo[a]pyrene	daily maximum	≤ .048 mg/L	all year	102
Chlorobenzene	daily maximum	≤ .38 mg/L	all year	102
Chrysene	daily maximum	≤ .047 mg/L	all year	102
Diethyl phthalate	daily maximum	≤ .113 mg/L	all year	102
Dimethyl phthalate	daily maximum	≤ .047 mg/L	all year	102
Ethylbenzene	daily maximum	≤ .38 mg/L	all year	102
Fluoranthene	daily maximum	≤ .054 mg/L	all year	102
Fluorene	daily maximum	≤ .047 mg/L	all year	102
Hexachlorobutadiene	daily maximum	≤ .38 mg/L	all year	102
Hexachloroethane	daily maximum	≤ .794 mg/L	all year	102
Methyl chloride [Chloromethane]	daily maximum	≤ .295 mg/L	all year	102
Methylene chloride	daily maximum	≤ .17 mg/L	all year	102
Nitrobenzene	daily maximum	≤ 6.402 mg/L	all year	102
Phenanthrene	daily maximum	≤ .047 mg/L	all year	102
Pyrene	daily maximum	≤ .048 mg/L	all year	102
Tetrachloroethylene	daily maximum	≤ .164 mg/L	all year	102
1,1-Dichloroethane	daily maximum	≤ .059 mg/L	all year	102
1,1-Dichloroethylene	daily maximum	≤ .06 mg/L	all year	102
1,1,1-Trichloroethane	daily maximum	≤ .059 mg/L	all year	102
1,1,2-Trichloroethane	daily maximum	≤ .127 mg/L	all year	102
Benzo[a]anthracene	daily maximum	≤ .047 mg/L	all year	102
1,2-Dichloroethane, total weight	daily maximum	≤ .574 mg/L	all year	102
1,2-Dichlorobenzene	daily maximum	≤ .794 mg/L	all year	102
1,2-Dichloropropane	daily maximum	≤ .794 mg/L	all year	102
trans-1,2-Dichloroethylene	daily maximum	≤ .066 mg/L	all year	102
1,2,4-Trichlorobenzene	daily maximum	≤ .794 mg/L	all year	102
1,3-Dichlorobenzene	daily maximum	≤ .38 mg/L	all year	102
1,4-Dichlorobenzene	daily maximum	≤ .38 mg/L	all year	102
2-Nitrophenol	daily maximum	≤ .231 mg/L	all year	102
2,4-Dimethylphenol	daily maximum	≤ .047 mg/L	all year	102
2,4-Dinitrophenol	daily maximum	≤ 4.291 mg/L	all year	102
4-Nitrophenol	daily maximum	≤ .576 mg/L	all year	102
4,6-Dinitro-o-cresol	daily maximum	≤ .277 mg/L	all year	102
Phenol	daily maximum	≤ .047 mg/L	all year	102
Naphthalene	daily maximum	≤ .047 mg/L	all year	102
Di[2-ethylhexyl] phthalate [DEHP]	daily maximum	≤ .258 mg/L	all year	102
Di-n-butyl phthalate	daily maximum	≤ .043 mg/L	all year	102
Vinyl chloride	daily maximum	≤ .172 mg/L	all year	102
Trichloroethylene	daily maximum	≤ .069 mg/L	all year	102
Hexachlorobenzene	daily maximum	≤ .794 mg/L	all year	102
Flow, in conduit or thru treatment plant	daily average	≤ .001 MGD	all year	102
Flow, in conduit or thru treatment plant	daily maximum	≤ .002 MGD	all year	102
1,3-Dichloropropylene	daily maximum	≤ .794 mg/L	all year	102
3,4-Benzofluoranthene	daily maximum	≤ .048 mg/L	all year	102
Chloroethane	daily maximum	≤ .295 mg/L	all year	102
BOD, 5-day, 20 deg. C	daily maximum	≤ 80 mg/L	all year	202
Solids, total suspended	daily maximum	≤ 149 mg/L	all year	202
Carbon tetrachloride	daily maximum	≤ .38 mg/L	all year	202
Chloroform	daily maximum	≤ .325 mg/L	all year	202
Toluene	daily maximum	≤ .074 mg/L	all year	202
Benzene	daily maximum	≤ .134 mg/L	all year	202
Acenaphthylene	daily maximum	≤ .047 mg/L	all year	202
Acenaphthene	daily maximum	≤ .047 mg/L	all year	202
Acrylonitrile	daily maximum	≤ .232 mg/L	all year	202
Anthracene	daily maximum	≤ .047 mg/L	all year	202
Benzo[k]fluoranthene	daily maximum	≤ .047 mg/L	all year	202
Benzo[a]pyrene	daily maximum	≤ .048 mg/L	all year	202
Chlorobenzene	daily maximum	≤ .38 mg/L	all year	202
Chrysene	daily maximum	≤ .047 mg/L	all year	202
Diethyl phthalate	daily maximum	≤ .113 mg/L	all year	202
Dimethyl phthalate	daily maximum	≤ .047 mg/L	all year	202
Ethylbenzene	daily maximum	≤ .38 mg/L	all year	202
Fluoranthene	daily maximum	≤ .054 mg/L	all year	202
Fluorene	daily maximum	≤ .047 mg/L	all year	202
Hexachlorobutadiene	daily maximum	≤ .38 mg/L	all year	202
Hexachloroethane	daily maximum	≤ .794 mg/L	all year	202
Methyl chloride [Chloromethane]	daily maximum	≤ .295 mg/L	all year	202
Methylene chloride	daily maximum	≤ .17 mg/L	all year	202
Nitrobenzene	daily maximum	≤ 6.402 mg/L	all year	202
Phenanthrene	daily maximum	≤ .047 mg/L	all year	202
Pyrene	daily maximum	≤ .048 mg/L	all year	202
Tetrachloroethylene	daily maximum	≤ .164 mg/L	all year	202
1,1-Dichloroethane	daily maximum	≤ .059 mg/L	all year	202
1,1-Dichloroethylene	daily maximum	≤ .06 mg/L	all year	202
1,1,1-Trichloroethane	daily maximum	≤ .059 mg/L	all year	202
1,1,2-Trichloroethane	daily maximum	≤ .127 mg/L	all year	202
Benzo[a]anthracene	daily maximum	≤ .047 mg/L	all year	202
1,2-Dichloroethane, total weight	daily maximum	≤ .574 mg/L	all year	202
1,2-Dichlorobenzene	daily maximum	≤ .794 mg/L	all year	202
1,2-Dichloropropane	daily maximum	≤ .794 mg/L	all year	202
trans-1,2-Dichloroethylene	daily maximum	≤ .066 mg/L	all year	202
1,2,4-Trichlorobenzene	daily maximum	≤ .794 mg/L	all year	202
1,3-Dichlorobenzene	daily maximum	≤ .38 mg/L	all year	202
1,4-Dichlorobenzene	daily maximum	≤ .38 mg/L	all year	202
2-Nitrophenol	daily maximum	≤ .231 mg/L	all year	202
2,4-Dimethylphenol	daily maximum	≤ .047 mg/L	all year	202
2,4-Dinitrophenol	daily maximum	≤ 4.291 mg/L	all year	202
4-Nitrophenol	daily maximum	≤ .576 mg/L	all year	202
4,6-Dinitro-o-cresol	daily maximum	≤ .277 mg/L	all year	202
Phenol	daily maximum	≤ .047 mg/L	all year	202
Naphthalene	daily maximum	≤ .047 mg/L	all year	202
Di[2-ethylhexyl] phthalate [DEHP]	daily maximum	≤ .258 mg/L	all year	202
Di-n-butyl phthalate	daily maximum	≤ .043 mg/L	all year	202
Vinyl chloride	daily maximum	≤ .172 mg/L	all year	202
Trichloroethylene	daily maximum	≤ .069 mg/L	all year	202
Hexachlorobenzene	daily maximum	≤ .794 mg/L	all year	202
Flow, in conduit or thru treatment plant	daily average	≤ .001 MGD	all year	202
Flow, in conduit or thru treatment plant	daily maximum	≤ .002 MGD	all year	202
1,3-Dichloropropylene	daily maximum	≤ .794 mg/L	all year	202
3,4-Benzofluoranthene	daily maximum	≤ .048 mg/L	all year	202
Chloroethane	daily maximum	≤ .295 mg/L	all year	202

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/TX0077887 · MCP: https://passage-data.com/mcp