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Si Group Inc

Industrial Organic Chemicals, Freeport, Texas. NPDES permit TX0067946, in force until Jan 2, 2030. Last 12 months: no values over a limit, 1 required value missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (7 values), outfall 101 form A monthly (14 values), outfall 101 form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 24 reports late

Limits in force (123)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitdaily maximum≤ 95 deg Fall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Oil & Greasedaily maximum≤ 15 mg/Lall year001
Carbon, tot organic [TOC]daily maximum≤ 55 mg/Lall year001
Phenoldaily maximum≤ .4 mg/Lall year001
Flow [dry weather]daily maximum≤ 5.6 MGDall year001
BOD, 5-day, 20 deg. Cdaily average≤ 17 lb/dall year101
BOD, 5-day, 20 deg. Cdaily maximum≤ 46 lb/dall year101
pHminimum≥ 6 SUall year101
pHmaximum≤ 9 SUall year101
Solids, total suspendeddaily average≤ 25 lb/dall year101
Solids, total suspendeddaily maximum≤ 80 lb/dall year101
Oil & Greasedaily average≤ 5.2 lb/dall year101
Oil & Greasedaily maximum≤ 25 lb/dall year101
Carbon, tot organic [TOC]daily average≤ 52 lb/dall year101
Carbon, tot organic [TOC]daily maximum≤ 104 lb/dall year101
Carbon tetrachloridedaily average≤ .07 lb/dall year101
Carbon tetrachloridedaily maximum≤ .2 lb/dall year101
1,2-Dichloroethanedaily average≤ .09 lb/dall year101
1,2-Dichloroethanedaily maximum≤ .3 lb/dall year101
Chloroformdaily average≤ .06 lb/dall year101
Chloroformdaily maximum≤ .17 lb/dall year101
Toluenedaily average≤ .01 lb/dall year101
Toluenedaily maximum≤ .04 lb/dall year101
Benzenedaily average≤ .03 lb/dall year101
Benzenedaily maximum≤ .07 lb/dall year101
Acenaphthylenedaily average≤ .01 lb/dall year101
Acenaphthylenedaily maximum≤ .02 lb/dall year101
Acenaphthenedaily average≤ .01 lb/dall year101
Acenaphthenedaily maximum≤ .02 lb/dall year101
Acrylonitriledaily average≤ .05 lb/dall year101
Acrylonitriledaily maximum≤ .12 lb/dall year101
Anthracenedaily average≤ .01 lb/dall year101
Anthracenedaily maximum≤ .02 lb/dall year101
Benzo[k]fluoranthenedaily average≤ .01 lb/dall year101
Benzo[k]fluoranthenedaily maximum≤ .02 lb/dall year101
Benzo[a]pyrenedaily average≤ .01 lb/dall year101
Benzo[a]pyrenedaily maximum≤ .02 lb/dall year101
Chlorobenzenedaily average≤ .07 lb/dall year101
Chlorobenzenedaily maximum≤ .2 lb/dall year101
Chrysenedaily average≤ .01 lb/dall year101
Chrysenedaily maximum≤ .02 lb/dall year101
Diethyl phthalatedaily average≤ .02 lb/dall year101
Diethyl phthalatedaily maximum≤ .06 lb/dall year101
Dimethyl phthalatedaily average≤ .01 lb/dall year101
Dimethyl phthalatedaily maximum≤ .02 lb/dall year101
Ethylbenzenedaily average≤ .07 lb/dall year101
Ethylbenzenedaily maximum≤ .19 lb/dall year101
Fluoranthenedaily average≤ .01 lb/dall year101
Fluoranthenedaily maximum≤ .03 lb/dall year101
Fluorenedaily average≤ .01 lb/dall year101
Fluorenedaily maximum≤ .02 lb/dall year101
Hexachlorobutadienedaily average≤ .07 lb/dall year101
Hexachlorobutadienedaily maximum≤ .2 lb/dall year101
Hexachloroethanedaily average≤ .1 lb/dall year101
Hexachloroethanedaily maximum≤ .41 lb/dall year101
Methyl chloride [Chloromethane]daily average≤ .06 lb/dall year101
Methyl chloride [Chloromethane]daily maximum≤ .15 lb/dall year101
Methylene chloridedaily average≤ .02 lb/dall year101
Methylene chloridedaily maximum≤ .09 lb/dall year101
Nitrobenzenedaily average≤ 1.16 lb/dall year101
Nitrobenzenedaily maximum≤ 3.31 lb/dall year101
Phenanthrenedaily average≤ .01 lb/dall year101
Phenanthrenedaily maximum≤ .02 lb/dall year101
Pyrenedaily average≤ .01 lb/dall year101
Pyrenedaily maximum≤ .02 lb/dall year101
Tetrachloroethylenedaily average≤ .03 lb/dall year101
Tetrachloroethylenedaily maximum≤ .08 lb/dall year101
1,1-Dichloroethanedaily average≤ .01 lb/dall year101
1,1-Dichloroethanedaily maximum≤ .03 lb/dall year101
1,1-Dichloroethylenedaily average≤ .01 lb/dall year101
1,1-Dichloroethylenedaily maximum≤ .03 lb/dall year101
1,1,1-Trichloroethanedaily average≤ .01 lb/dall year101
1,1,1-Trichloroethanedaily maximum≤ .03 lb/dall year101
1,1,2-Trichloroethanedaily average≤ .01 lb/dall year101
1,1,2-Trichloroethanedaily maximum≤ .07 lb/dall year101
Benzo[a]anthracenedaily average≤ .01 lb/dall year101
Benzo[a]anthracenedaily maximum≤ .02 lb/dall year101
1,2-Dichlorobenzenedaily average≤ .1 lb/dall year101
1,2-Dichlorobenzenedaily maximum≤ .41 lb/dall year101
1,2-Dichloropropanedaily average≤ .1 lb/dall year101
1,2-Dichloropropanedaily maximum≤ .41 lb/dall year101
trans-1,2-Dichloroethylenedaily average≤ .01 lb/dall year101
trans-1,2-Dichloroethylenedaily maximum≤ .03 lb/dall year101
1,2,4-Trichlorobenzenedaily average≤ .1 lb/dall year101
1,2,4-Trichlorobenzenedaily maximum≤ .41 lb/dall year101
1,3-Dichlorobenzenedaily average≤ .07 lb/dall year101
1,3-Dichlorobenzenedaily maximum≤ .2 lb/dall year101
1,4-Dichlorobenzenedaily average≤ .07 lb/dall year101
1,4-Dichlorobenzenedaily maximum≤ .2 lb/dall year101
2-Nitrophenoldaily average≤ .03 lb/dall year101
2-Nitrophenoldaily maximum≤ .12 lb/dall year101
2,4-Dimethylphenoldaily average≤ .01 lb/dall year101
2,4-Dimethylphenoldaily maximum≤ .02 lb/dall year101
2,4-Dinitrophenoldaily average≤ .62 lb/dall year101
2,4-Dinitrophenoldaily maximum≤ 2.22 lb/dall year101
4-Nitrophenoldaily average≤ .08 lb/dall year101
4-Nitrophenoldaily maximum≤ .3 lb/dall year101
4,6-Dinitro-o-cresoldaily average≤ .04 lb/dall year101
4,6-Dinitro-o-cresoldaily maximum≤ .14 lb/dall year101
Phenoldaily average≤ .01 lb/dall year101
Phenoldaily maximum≤ .02 lb/dall year101
Naphthalenedaily average≤ .01 lb/dall year101
Naphthalenedaily maximum≤ .02 lb/dall year101
Di[2-ethylhexyl] phthalate [DEHP]daily average≤ .05 lb/dall year101
Di[2-ethylhexyl] phthalate [DEHP]daily maximum≤ .13 lb/dall year101
Di-n-butyl phthalatedaily average≤ .01 lb/dall year101
Di-n-butyl phthalatedaily maximum≤ .02 lb/dall year101
Vinyl chloridedaily average≤ .05 lb/dall year101
Vinyl chloridedaily maximum≤ .09 lb/dall year101
Trichloroethylenedaily average≤ .01 lb/dall year101
Trichloroethylenedaily maximum≤ .04 lb/dall year101
Hexachlorobenzenedaily average≤ .1 lb/dall year101
Hexachlorobenzenedaily maximum≤ .41 lb/dall year101
Flow, in conduit or thru treatment plantdaily average≤ .2 MGDall year101
Flow, in conduit or thru treatment plantdaily maximum≤ .6 MGDall year101
1,3-Dichloropropylenedaily average≤ .1 lb/dall year101
1,3-Dichloropropylenedaily maximum≤ .41 lb/dall year101
3,4-Benzofluoranthenedaily average≤ .01 lb/dall year101
3,4-Benzofluoranthenedaily maximum≤ .02 lb/dall year101
Chloroethanedaily average≤ .06 lb/dall year101
Chloroethanedaily maximum≤ .15 lb/dall year101

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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