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Monument Chemical Port Arthur LLC

Industrial Organic Chemicals, Port Arthur, Texas. NPDES permit TX0116360, in force until Jan 5, 2029. Last 12 months: over a limit 6 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (16 values), form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
3 values over a limit, 0 required values missing, 0 of 13 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
January 2026BOD, 5-day, 20 deg. C, daily average> 3.15 lb/d≤ 9.28 lb/d—
January 2026BOD, 5-day, 20 deg. C, daily average> 6 mg/L≤ 30 mg/L—
January 2026BOD, 5-day, 20 deg. C, daily maximum> 15 mg/L≤ 90 mg/L—
January 2026BOD, 5-day, 20 deg. C, daily maximum> 8.47 lb/d≤ 23.78 lb/d—
January 2026Naphthalene, daily average.0056 lb/d≤ .0025 lb/d124%
June 2026pH, maximum9.3 SU≤ 9 SU—

Limits in force (124)

ParameterStatisticLimitMonths
BOD, 5-day, 20 deg. Cdaily average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 90 mg/Lall year
BOD, 5-day, 20 deg. Cdaily average≤ 9.28 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 23.78 lb/dall year
Oxygen demand, chem. [high level] [COD]daily maximum≤ 200 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendeddaily average≤ 30 mg/Lall year
Solids, total suspendeddaily maximum≤ 100 mg/Lall year
Solids, total suspendeddaily average≤ 16.69 lb/dall year
Solids, total suspendeddaily maximum≤ 48.48 lb/dall year
Oil & Greasedaily maximum≤ 15 mg/Lall year
Zinc, total [as Zn]daily average≤ .21 mg/Lall year
Zinc, total [as Zn]daily maximum≤ .44 mg/Lall year
Carbon tetrachloridedaily average≤ .019 lb/dall year
Carbon tetrachloridedaily maximum≤ .05 lb/dall year
1,2-Dichloroethanedaily average≤ .024 lb/dall year
1,2-Dichloroethanedaily maximum≤ .076 lb/dall year
Chloroformdaily average≤ .015 lb/dall year
Chloroformdaily maximum≤ .043 lb/dall year
Toluenedaily average≤ .011 lb/dall year
Toluenedaily maximum≤ .028 lb/dall year
Benzenedaily average≤ .008 lb/dall year
Benzenedaily maximum≤ .018 lb/dall year
Acenaphthylenedaily average≤ .0025 lb/dall year
Acenaphthylenedaily maximum≤ .0062 lb/dall year
Acenaphthenedaily average≤ .0025 lb/dall year
Acenaphthenedaily maximum≤ .0062 lb/dall year
Acrylonitriledaily average≤ .012 lb/dall year
Acrylonitriledaily maximum≤ .031 lb/dall year
Anthracenedaily average≤ .0025 lb/dall year
Anthracenedaily maximum≤ .0062 lb/dall year
Benzo[k]fluoranthenedaily average≤ .0025 lb/dall year
Benzo[k]fluoranthenedaily maximum≤ .0062 lb/dall year
Benzo[a]pyrenedaily average≤ .000071 lb/dall year
Benzo[a]pyrenedaily maximum≤ .00015 lb/dall year
Chlorobenzenedaily average≤ .019 lb/dall year
Chlorobenzenedaily maximum≤ .05 lb/dall year
Chrysenedaily average≤ .0025 lb/dall year
Chrysenedaily maximum≤ .0062 lb/dall year
Diethyl phthalatedaily average≤ .006 lb/dall year
Diethyl phthalatedaily maximum≤ .015 lb/dall year
Dimethyl phthalatedaily average≤ .0025 lb/dall year
Dimethyl phthalatedaily maximum≤ .0062 lb/dall year
Ethylbenzenedaily average≤ .019 lb/dall year
Ethylbenzenedaily maximum≤ .05 lb/dall year
Fluoranthenedaily average≤ .0026 lb/dall year
Fluoranthenedaily maximum≤ .007 lb/dall year
Fluorenedaily average≤ .0025 lb/dall year
Fluorenedaily maximum≤ .0062 lb/dall year
Hexachlorobutadienedaily average≤ .0063 lb/dall year
Hexachlorobutadienedaily maximum≤ .013 lb/dall year
Hexachloroethanedaily average≤ .026 lb/dall year
Hexachloroethanedaily maximum≤ .1 lb/dall year
Methyl chloride [Chloromethane]daily average≤ .015 lb/dall year
Methyl chloride [Chloromethane]daily maximum≤ .039 lb/dall year
Methylene chloridedaily average≤ .0047 lb/dall year
Methylene chloridedaily maximum≤ .022 lb/dall year
Nitrobenzenedaily average≤ .29 lb/dall year
Nitrobenzenedaily maximum≤ .84 lb/dall year
Phenanthrenedaily average≤ .012 mg/Lall year
Phenanthrenedaily maximum≤ .026 mg/Lall year
Phenanthrenedaily average≤ .0025 lb/dall year
Phenanthrenedaily maximum≤ .0062 lb/dall year
Pyrenedaily average≤ .0026 lb/dall year
Pyrenedaily maximum≤ .0063 lb/dall year
Tetrachloroethylenedaily average≤ .013 lb/dall year
Tetrachloroethylenedaily maximum≤ .034 lb/dall year
1,1-Dichloroethanedaily average≤ .0029 lb/dall year
1,1-Dichloroethanedaily maximum≤ .0078 lb/dall year
1,1-Dichloroethylenedaily average≤ .0029 lb/dall year
1,1-Dichloroethylenedaily maximum≤ .0079 lb/dall year
1,1,1-Trichloroethanedaily average≤ .0029 lb/dall year
1,1,1-Trichloroethanedaily maximum≤ .0078 lb/dall year
1,1,2-Trichloroethanedaily average≤ .0042 lb/dall year
1,1,2-Trichloroethanedaily maximum≤ .017 lb/dall year
Benzo[a]anthracenedaily average≤ .00071 lb/dall year
Benzo[a]anthracenedaily maximum≤ .0015 lb/dall year
1,2-Dichlorobenzenedaily average≤ .026 lb/dall year
1,2-Dichlorobenzenedaily maximum≤ .1 lb/dall year
1,2-Dichloropropanedaily average≤ .026 lb/dall year
1,2-Dichloropropanedaily maximum≤ .1 lb/dall year
trans-1,2-Dichloroethylenedaily average≤ .0033 lb/dall year
trans-1,2-Dichloroethylenedaily maximum≤ .0087 lb/dall year
1,2,4-Trichlorobenzenedaily average≤ .026 lb/dall year
1,2,4-Trichlorobenzenedaily maximum≤ .1 lb/dall year
1,3-Dichlorobenzenedaily average≤ .019 lb/dall year
1,3-Dichlorobenzenedaily maximum≤ .05 lb/dall year
1,4-Dichlorobenzenedaily average≤ .019 lb/dall year
1,4-Dichlorobenzenedaily maximum≤ .05 lb/dall year
2-Nitrophenoldaily average≤ .0086 lb/dall year
2-Nitrophenoldaily maximum≤ .03 lb/dall year
2,4-Dimethylphenoldaily average≤ .0025 lb/dall year
2,4-Dimethylphenoldaily maximum≤ .0062 lb/dall year
2,4-Dinitrophenoldaily average≤ .16 lb/dall year
2,4-Dinitrophenoldaily maximum≤ .57 lb/dall year
4-Nitrophenoldaily average≤ .021 lb/dall year
4-Nitrophenoldaily maximum≤ .076 lb/dall year
4,6-Dinitro-o-cresoldaily average≤ .01 lb/dall year
4,6-Dinitro-o-cresoldaily maximum≤ .037 lb/dall year
Phenoldaily average≤ .0025 lb/dall year
Phenoldaily maximum≤ .006 lb/dall year
Naphthalenedaily average≤ .0025 lb/dall year
Naphthalenedaily maximum≤ .0062 lb/dall year
Di[2-ethylhexyl] phthalate [DEHP]daily average≤ .013 lb/dall year
Di[2-ethylhexyl] phthalate [DEHP]daily maximum≤ .034 lb/dall year
Di-n-butyl phthalatedaily average≤ .0026 lb/dall year
Di-n-butyl phthalatedaily maximum≤ .006 lb/dall year
Vinyl chloridedaily average≤ .011 lb/dall year
Vinyl chloridedaily maximum≤ .027 lb/dall year
Trichloroethylenedaily average≤ .013 lb/dall year
Trichloroethylenedaily maximum≤ .04 lb/dall year
Hexachlorobenzenedaily average≤ .000023 mg/Lall year
Hexachlorobenzenedaily maximum≤ .000049 mg/Lall year
Hexachlorobenzenedaily average≤ .000019 lb/dall year
Hexachlorobenzenedaily maximum≤ .000041 lb/dall year
Flow, in conduit or thru treatment plantdaily average≤ .1 MGDall year
Flow, in conduit or thru treatment plantdaily maximum≤ .2 MGDall year
1,3-Dichloropropylenedaily average≤ .026 lb/dall year
1,3-Dichloropropylenedaily maximum≤ .1 lb/dall year
3,4-Benzofluoranthenedaily average≤ .0026 lb/dall year
3,4-Benzofluoranthenedaily maximum≤ .0063 lb/dall year
Chloroethanedaily average≤ .015 lb/dall year
Chloroethanedaily maximum≤ .039 lb/dall year

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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Your permit document is the final word. As JSON: /api/v1/permits/TX0116360 · MCP: https://passage-data.com/mcp