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Si Group Inc

Industrial Organic Chemicals, Baytown, Texas. NPDES permit TX0087254, in force until Feb 28, 2029. Last 12 months: over a limit 16 times (last March 2026), 4 required values missing, 1 of 29 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (8 values), outfall 201 form A monthly (6 values), outfall 001 form Y yearly, outfall 201 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
1 value over a limit, 0 required values missing, 0 of 32 reports late

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

All 16 values over a limit
Period endingParameterReportedLimitOver by
December 2025Whole Effluent Toxicity [WET] - C. dubia, 7-day minimum32 %≥ 100 %68%
December 2025Whole Effluent Toxicity [WET] - C. dubia, 7-day minimum32 %≥ 100 %68%
December 2025Whole Effluent Toxicity [WET] - C. dubia, 7-day minimum32 %≥ 80 %60%
December 2025Whole Effluent Toxicity [WET] - C. dubia, 7-day minimum32 %≥ 80 %60%
December 2025Whole Effluent Toxicity [WET] - C. dubia, monthly average minimum32 %≥ 100 %68%
December 2025Whole Effluent Toxicity [WET] - C. dubia, monthly average minimum32 %≥ 100 %68%
December 2025Whole Effluent Toxicity [WET] - C. dubia, monthly average minimum32 %≥ 80 %60%
December 2025Whole Effluent Toxicity [WET] - C. dubia, monthly average minimum32 %≥ 80 %60%
March 2026Whole Effluent Toxicity [WET] - C. dubia, 7-day minimum32 %≥ 100 %68%
March 2026Whole Effluent Toxicity [WET] - C. dubia, 7-day minimum32 %≥ 80 %60%
March 2026Whole Effluent Toxicity [WET] - C. dubia, monthly average minimum32 %≥ 100 %68%
March 2026Whole Effluent Toxicity [WET] - C. dubia, monthly average minimum32 %≥ 80 %60%
March 2026Whole Effluent Toxicity [WET] - P. promelas, 7-day minimum0 %≥ 80 %100%
March 2026Whole Effluent Toxicity [WET] - P. promelas, 7-day minimum32 %≥ 100 %68%
March 2026Whole Effluent Toxicity [WET] - P. promelas, monthly average minimum0 %≥ 80 %100%
March 2026Whole Effluent Toxicity [WET] - P. promelas, monthly average minimum32 %≥ 100 %68%

Limits in force (180)

ParameterStatisticLimitMonthsOutfall
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Oil & Greasedaily maximum≤ 15 mg/Lall year001
Carbon, tot organic [TOC]daily maximum≤ 75 mg/Lall year001
Carbon tetrachloridedaily average≤ .007656 mg/Lall year001
Carbon tetrachloridedaily maximum≤ .0162 mg/Lall year001
1,2-Dichloroethanedaily average≤ .0674 mg/Lall year001
1,2-Dichloroethanedaily maximum≤ .1426 mg/Lall year001
Acrylonitriledaily average≤ .00519 mg/Lall year001
Acrylonitriledaily maximum≤ .011 mg/Lall year001
Benzo[a]pyrenedaily average≤ .000451 mg/Lall year001
Benzo[a]pyrenedaily maximum≤ .000954 mg/Lall year001
Chrysenedaily averagereport only (mg/L)all year001
Chrysenedaily maximumreport only (mg/L)all year001
Hexachlorobutadienedaily average≤ .003281 mg/Lall year001
Hexachlorobutadienedaily maximum≤ .006942 mg/Lall year001
Hexachloroethanedaily average≤ .0848 mg/Lall year001
Hexachloroethanedaily maximum≤ .179 mg/Lall year001
1,1-Dichloroethylenedaily average≤ .005332 mg/Lall year001
1,1-Dichloroethylenedaily maximum≤ .01128 mg/Lall year001
Benzo[a]anthracenedaily average≤ .000451 mg/Lall year001
Benzo[a]anthracenedaily maximum≤ .000954 mg/Lall year001
Di[2-ethylhexyl] phthalate [DEHP]daily averagereport only (mg/L)all year001
Di[2-ethylhexyl] phthalate [DEHP]daily maximumreport only (mg/L)all year001
Hexachlorobenzenedaily average≤ .0000062 mg/Lall year001
Hexachlorobenzenedaily maximum≤ .000013 mg/Lall year001
Flow, in conduit or thru treatment plantdaily averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
n-Propyl alcoholdaily average≤ 10 mg/Lall year001
n-Propyl alcoholdaily maximum≤ 25 mg/Lall year001
1,3-Dichloropropenedaily average≤ .196 mg/Lall year001
1,3-Dichloropropenedaily maximum≤ .3095 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily average≤ 2.4 lb/dall year201
BOD, 5-day, 20 deg. Cdaily maximum≤ 4.9 lb/dall year201
Solids, total suspendeddaily average≤ 6.27 lb/dall year201
Solids, total suspendeddaily maximum≤ 20.2 lb/dall year201
Carbon tetrachloridedaily average≤ .00209 lb/dall year201
Carbon tetrachloridedaily maximum≤ .00558 lb/dall year201
1,2-Dichloroethanedaily average≤ .00264 lb/dall year201
1,2-Dichloroethanedaily maximum≤ .00843 lb/dall year201
Chloroformdaily average≤ .00163 lb/dall year201
Chloroformdaily maximum≤ .00477 lb/dall year201
Toluenedaily average≤ .000411 lb/dall year201
Toluenedaily maximum≤ .00109 lb/dall year201
Benzenedaily average≤ .000837 lb/dall year201
Benzenedaily maximum≤ .00197 lb/dall year201
Acenaphthylenedaily average≤ .000279 lb/dall year201
Acenaphthylenedaily maximum≤ .00069 lb/dall year201
Acenaphthenedaily average≤ .000279 lb/dall year201
Acenaphthenedaily maximum≤ .00069 lb/dall year201
Acrylonitriledaily average≤ .00138 lb/dall year201
Acrylonitriledaily maximum≤ .00341 lb/dall year201
Anthracenedaily average≤ .000279 lb/dall year201
Anthracenedaily maximum≤ .00069 lb/dall year201
Benzo[k]fluoranthenedaily average≤ .000279 lb/dall year201
Benzo[k]fluoranthenedaily maximum≤ .00069 lb/dall year201
Benzo[a]pyrenedaily average≤ .000294 lb/dall year201
Benzo[a]pyrenedaily maximum≤ .000705 lb/dall year201
Chlorobenzenedaily average≤ .00209 lb/dall year201
Chlorobenzenedaily maximum≤ .00558 lb/dall year201
Chrysenedaily average≤ .000279 lb/dall year201
Chrysenedaily maximum≤ .00069 lb/dall year201
Diethyl phthalatedaily average≤ .000676 lb/dall year201
Diethyl phthalatedaily maximum≤ .00166 lb/dall year201
Dimethyl phthalatedaily average≤ .000279 lb/dall year201
Dimethyl phthalatedaily maximum≤ .00069 lb/dall year201
Ethylbenzenedaily average≤ .00209 lb/dall year201
Ethylbenzenedaily maximum≤ .00558 lb/dall year201
Fluoranthenedaily average≤ .000323 lb/dall year201
Fluoranthenedaily maximum≤ .000793 lb/dall year201
Fluorenedaily average≤ .000279 lb/dall year201
Fluorenedaily maximum≤ .00069 lb/dall year201
Hexachlorobutadienedaily average≤ .002086 lb/dall year201
Hexachlorobutadienedaily maximum≤ .005581 lb/dall year201
Hexachloroethanedaily average≤ .00288 lb/dall year201
Hexachloroethanedaily maximum≤ .0117 lb/dall year201
Methyl chloride [Chloromethane]daily average≤ .00162 lb/dall year201
Methyl chloride [Chloromethane]daily maximum≤ .00433 lb/dall year201
Methylene chloridedaily average≤ .000529 lb/dall year201
Methylene chloridedaily maximum≤ .0025 lb/dall year201
Nitrobenzenedaily average≤ .0329 lb/dall year201
Nitrobenzenedaily maximum≤ .094 lb/dall year201
Phenanthrenedaily average≤ .000279 lb/dall year201
Phenanthrenedaily maximum≤ .00069 lb/dall year201
Pyrenedaily average≤ .000294 lb/dall year201
Pyrenedaily maximum≤ .000705 lb/dall year201
Tetrachloroethylenedaily average≤ .000764 lb/dall year201
Tetrachloroethylenedaily maximum≤ .00241 lb/dall year201
1,1-Dichloroethanedaily average≤ .000323 lb/dall year201
1,1-Dichloroethanedaily maximum≤ .000867 lb/dall year201
1,1-Dichloroethylenedaily average≤ .000323 lb/dall year201
1,1-Dichloroethylenedaily maximum≤ .000881 lb/dall year201
1,1,1-Trichloroethanedaily average≤ .000323 lb/dall year201
1,1,1-Trichloroethanedaily maximum≤ .000867 lb/dall year201
1,1,2-Trichloroethanedaily average≤ .00047 lb/dall year201
1,1,2-Trichloroethanedaily maximum≤ .00187 lb/dall year201
Benzo[a]anthracenedaily average≤ .000279 lb/dall year201
Benzo[a]anthracenedaily maximum≤ .00069 lb/dall year201
1,2-Dichlorobenzenedaily average≤ .00288 lb/dall year201
1,2-Dichlorobenzenedaily maximum≤ .0117 lb/dall year201
1,2-Dichloropropanedaily average≤ .00288 lb/dall year201
1,2-Dichloropropanedaily maximum≤ .0117 lb/dall year201
trans-1,2-Dichloroethylenedaily average≤ .000367 lb/dall year201
trans-1,2-Dichloroethylenedaily maximum≤ .000969 lb/dall year201
1,2,4-Trichlorobenzenedaily average≤ .00288 lb/dall year201
1,2,4-Trichlorobenzenedaily maximum≤ .0117 lb/dall year201
1,3-Dichlorobenzenedaily average≤ .00209 lb/dall year201
1,3-Dichlorobenzenedaily maximum≤ .00558 lb/dall year201
1,4-Dichlorobenzenedaily average≤ .00209 lb/dall year201
1,4-Dichlorobenzenedaily maximum≤ .00558 lb/dall year201
2-Nitrophenoldaily average≤ .000955 lb/dall year201
2-Nitrophenoldaily maximum≤ .00339 lb/dall year201
2,4-Dimethylphenoldaily average≤ .000279 lb/dall year201
2,4-Dimethylphenoldaily maximum≤ .00069 lb/dall year201
2,4-Dinitrophenoldaily average≤ .0177 lb/dall year201
2,4-Dinitrophenoldaily maximum≤ .063 lb/dall year201
4-Nitrophenoldaily average≤ .002379 lb/dall year201
4-Nitrophenoldaily maximum≤ .00846 lb/dall year201
4,6-Dinitro-o-cresoldaily average≤ .00115 lb/dall year201
4,6-Dinitro-o-cresoldaily maximum≤ .00407 lb/dall year201
Phenoldaily average≤ .000279 lb/dall year201
Phenoldaily maximum≤ .00069 lb/dall year201
Naphthalenedaily average≤ .000279 lb/dall year201
Naphthalenedaily maximum≤ .00069 lb/dall year201
Di[2-ethylhexyl] phthalate [DEHP]daily average≤ .00139 lb/dall year201
Di[2-ethylhexyl] phthalate [DEHP]daily maximum≤ .00379 lb/dall year201
Di-n-butyl phthalatedaily average≤ .000294 lb/dall year201
Di-n-butyl phthalatedaily maximum≤ .000632 lb/dall year201
Vinyl chloridedaily average≤ .00143 lb/dall year201
Vinyl chloridedaily maximum≤ .00253 lb/dall year201
Trichloroethylenedaily average≤ .000382 lb/dall year201
Trichloroethylenedaily maximum≤ .00101 lb/dall year201
Hexachlorobenzenedaily average≤ .00288 lb/dall year201
Hexachlorobenzenedaily maximum≤ .0117 lb/dall year201
Flow, in conduit or thru treatment plantdaily average≤ .022 MGDall year201
Flow, in conduit or thru treatment plantdaily maximum≤ .05 MGDall year201
1,3-Dichloropropylenedaily average≤ .00288 lb/dall year201
1,3-Dichloropropylenedaily maximum≤ .0117 lb/dall year201
3,4-Benzofluoranthenedaily average≤ .000294 lb/dall year201
3,4-Benzofluoranthenedaily maximum≤ .000705 lb/dall year201
Chloroethanedaily average≤ .00162 lb/dall year201
Chloroethanedaily maximum≤ .00433 lb/dall year201
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
Whole Effluent Toxicity [WET] - C. dubia7-day minimum≥ 100 %all yearTX1
Whole Effluent Toxicity [WET] - C. dubiamonthly average minimum≥ 100 %all yearTX1
Whole Effluent Toxicity [WET] - C. dubia7-day minimum≥ 80 %all yearTX1
Whole Effluent Toxicity [WET] - C. dubiamonthly average minimum≥ 80 %all yearTX1
Whole Effluent Toxicity [WET] - P. promelas7-day minimum≥ 100 %all yearTX1
Whole Effluent Toxicity [WET] - P. promelasmonthly average minimum≥ 100 %all yearTX1
Whole Effluent Toxicity [WET] - P. promelas7-day minimum≥ 80 %all yearTX1
Whole Effluent Toxicity [WET] - P. promelasmonthly average minimum≥ 80 %all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas7-day minimumreport only (pass=0;fail=1)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelasmonthly average minimumreport only (pass=0;fail=1)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all yearTX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all yearTX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX1
LOEC Sub-Lethal Reproduction 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

New limits from Mar 1, 2027

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Benzo[a]anthracene, daily average0.0000569 mg/Ltighter——
Benzo[a]anthracene, daily maximum0.00012 mg/Ltighter——
Benzo[a]pyrene, daily average0.00000569 mg/Ltighter——
Benzo[a]pyrene, daily maximum0.000012 mg/Ltighter——
Chrysene, daily average0.00574 mg/Lnew——
Chrysene, daily maximum0.0121 mg/Lnew——
Di[2-ethylhexyl] phthalate [DEHP], daily average0.0172 mg/Lnew——
Di[2-ethylhexyl] phthalate [DEHP], daily maximum0.0362 mg/Lnew——
Hexachlorobenzene, daily average0.0000015 mg/Ltighter——
Hexachlorobenzene, daily maximum0.0000033 mg/Ltighter——
Hexachlorobutadiene, daily average0.000501 mg/Ltighter——
Hexachlorobutadiene, daily maximum0.00106 mg/Ltighter——
Hexachloroethane, daily average0.0053 mg/Ltighter——
Hexachloroethane, daily maximum0.0112 mg/Ltighter——

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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