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Trecora Hydrocarbons LLC

Industrial Organic Chemicals, major discharger, Silsbee, Texas. NPDES permit TX0003204, in force until Aug 9, 2029. Last 12 months: over a limit once (last May 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (37 values), outfall 002 form A monthly (6 values), outfall 003 form A monthly (8 values), outfall 004 form A monthly (8 values), outfall 001 form Y yearly, outfall TX1 form Q quarterly, and 1 more form
Last report on file
August 2026
Oct 2024 – Sep 2025
5 values over a limit, 0 required values missing, 0 of 54 reports late

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

Period endingParameterReportedLimitOver by
May 2026Flow, in conduit or thru treatment plant, daily maximum.264853 MGD≤ .228 MGD16%

Limits in force (204)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitdaily maximum≤ 98 deg Fall year001
BOD, 5-day, 20 deg. Cdaily average≤ 4.8 lb/dall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 12.1 lb/dall year001
Oxygen demand, chem. [high level] [COD]daily average≤ 251.7 lb/dall year001
Oxygen demand, chem. [high level] [COD]daily maximum≤ 478 lb/dall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendeddaily average≤ 9.3 lb/dall year001
Solids, total suspendeddaily maximum≤ 26.1 lb/dall year001
Oil & Greasedaily average≤ 11.1 lb/dall year001
Oil & Greasedaily maximum≤ 20.7 lb/dall year001
Nitrogen, ammonia total [as N]daily average≤ 2.9 lb/dall year001
Nitrogen, ammonia total [as N]daily maximum≤ 4.8 lb/dall year001
Cyanide, free [as free]daily average≤ .003 lb/dall year001
Cyanide, free [as free]daily maximum≤ .006 lb/dall year001
Sulfide, total [as S]daily average≤ .1 lb/dall year001
Sulfide, total [as S]daily maximum≤ .3 lb/dall year001
Chloride [as Cl]daily maximum≤ 300 mg/Lall year001
Copper, total [as Cu]daily averagereport only (mg/L)all year001
Copper, total [as Cu]daily maximumreport only (mg/L)all year001
Copper, total [as Cu]daily average≤ .0047 lb/dall year001
Copper, total [as Cu]daily maximum≤ .01 lb/dall year001
Lead, total [as Pb]daily averagereport only (mg/L)all year001
Lead, total [as Pb]daily maximumreport only (mg/L)all year001
Lead, total [as Pb]daily average≤ .0015 lb/dall year001
Lead, total [as Pb]daily maximum≤ .0032 lb/dall year001
Zinc, total [as Zn]daily averagereport only (mg/L)all year001
Zinc, total [as Zn]daily maximumreport only (mg/L)all year001
Zinc, total [as Zn]daily average≤ .056 lb/dall year001
Zinc, total [as Zn]daily maximum≤ .118 lb/dall year001
Aluminum, total [as Al]daily average≤ .79 lb/dall year001
Aluminum, total [as Al]daily maximum≤ 1.68 lb/dall year001
Carbon tetrachloridedaily average≤ .001 lb/dall year001
Carbon tetrachloridedaily maximum≤ .002 lb/dall year001
1,2-Dichloroethanedaily average≤ .004 lb/dall year001
1,2-Dichloroethanedaily maximum≤ .011 lb/dall year001
Chloroformdaily average≤ .001 lb/dall year001
Chloroformdaily maximum≤ .002 lb/dall year001
Toluenedaily average≤ .001 lb/dall year001
Toluenedaily maximum≤ .004 lb/dall year001
Benzenedaily average≤ .002 lb/dall year001
Benzenedaily maximum≤ .007 lb/dall year001
Acenaphthylenedaily average≤ .001 lb/dall year001
Acenaphthylenedaily maximum≤ .003 lb/dall year001
Acenaphthenedaily average≤ .001 lb/dall year001
Acenaphthenedaily maximum≤ .003 lb/dall year001
Acrylonitriledaily average≤ .005 lb/dall year001
Acrylonitriledaily maximum≤ .013 lb/dall year001
Anthracenedaily average≤ .001 lb/dall year001
Anthracenedaily maximum≤ .003 lb/dall year001
Benzo[k]fluoranthenedaily average≤ .001 lb/dall year001
Benzo[k]fluoranthenedaily maximum≤ .003 lb/dall year001
Benzo[a]pyrenedaily average≤ .00018 lb/dall year001
Benzo[a]pyrenedaily maximum≤ .00038 lb/dall year001
Chlorobenzenedaily average≤ .001 lb/dall year001
Chlorobenzenedaily maximum≤ .002 lb/dall year001
Chrysenedaily average≤ .0003 lb/dall year001
Chrysenedaily maximum≤ .0006 lb/dall year001
Diethyl phthalatedaily average≤ .004 lb/dall year001
Diethyl phthalatedaily maximum≤ .011 lb/dall year001
Dimethyl phthalatedaily average≤ .001 lb/dall year001
Dimethyl phthalatedaily maximum≤ .003 lb/dall year001
Ethylbenzenedaily average≤ .002 lb/dall year001
Ethylbenzenedaily maximum≤ .006 lb/dall year001
Fluoranthenedaily average≤ .001 lb/dall year001
Fluoranthenedaily maximum≤ .004 lb/dall year001
Fluorenedaily average≤ .001 lb/dall year001
Fluorenedaily maximum≤ .003 lb/dall year001
Hexachlorobutadienedaily average≤ .001 lb/dall year001
Hexachlorobutadienedaily maximum≤ .003 lb/dall year001
Hexachloroethanedaily average≤ .001 lb/dall year001
Hexachloroethanedaily maximum≤ .003 lb/dall year001
Methyl chloride [Chloromethane]daily average≤ .005 lb/dall year001
Methyl chloride [Chloromethane]daily maximum≤ .01 lb/dall year001
Methylene chloridedaily average≤ .002 lb/dall year001
Methylene chloridedaily maximum≤ .005 lb/dall year001
Nitrobenzenedaily average≤ .001 lb/dall year001
Nitrobenzenedaily maximum≤ .004 lb/dall year001
Phenanthrenedaily average≤ .001 lb/dall year001
Phenanthrenedaily maximum≤ .003 lb/dall year001
Pyrenedaily average≤ .001 lb/dall year001
Pyrenedaily maximum≤ .004 lb/dall year001
Tetrachloroethylenedaily average≤ .001 lb/dall year001
Tetrachloroethylenedaily maximum≤ .003 lb/dall year001
1,1-Dichloroethanedaily average≤ .001 lb/dall year001
1,1-Dichloroethanedaily maximum≤ .003 lb/dall year001
1,1-Dichloroethylenedaily average≤ .001 lb/dall year001
1,1-Dichloroethylenedaily maximum≤ .002 lb/dall year001
1,1,1-Trichloroethanedaily average≤ .001 lb/dall year001
1,1,1-Trichloroethanedaily maximum≤ .003 lb/dall year001
1,1,2-Trichloroethanedaily average≤ .001 lb/dall year001
1,1,2-Trichloroethanedaily maximum≤ .003 lb/dall year001
Benzo[a]anthracenedaily average≤ .0003 lb/dall year001
Benzo[a]anthracenedaily maximum≤ .0006 lb/dall year001
1,2-Dichlorobenzenedaily average≤ .004 lb/dall year001
1,2-Dichlorobenzenedaily maximum≤ .009 lb/dall year001
1,2-Dichloropropanedaily average≤ .008 lb/dall year001
1,2-Dichloropropanedaily maximum≤ .012 lb/dall year001
trans-1,2-Dichloroethylenedaily average≤ .001 lb/dall year001
trans-1,2-Dichloroethylenedaily maximum≤ .003 lb/dall year001
1,2,4-Trichlorobenzenedaily average≤ .004 lb/dall year001
1,2,4-Trichlorobenzenedaily maximum≤ .008 lb/dall year001
1,3-Dichlorobenzenedaily average≤ .002 lb/dall year001
1,3-Dichlorobenzenedaily maximum≤ .003 lb/dall year001
1,4-Dichlorobenzenedaily average≤ .001 lb/dall year001
1,4-Dichlorobenzenedaily maximum≤ .002 lb/dall year001
2-Chlorophenoldaily average≤ .002 lb/dall year001
2-Chlorophenoldaily maximum≤ .005 lb/dall year001
2-Nitrophenoldaily average≤ .002 lb/dall year001
2-Nitrophenoldaily maximum≤ .004 lb/dall year001
2,4-Dichlorophenoldaily average≤ .002 lb/dall year001
2,4-Dichlorophenoldaily maximum≤ .006 lb/dall year001
2,4-Dimethylphenoldaily average≤ .001 lb/dall year001
2,4-Dimethylphenoldaily maximum≤ .002 lb/dall year001
2,4-Dinitrotoluenedaily average≤ .006 lb/dall year001
2,4-Dinitrotoluenedaily maximum≤ .015 lb/dall year001
2,4-Dinitrophenoldaily average≤ .004 lb/dall year001
2,4-Dinitrophenoldaily maximum≤ .007 lb/dall year001
2,6-Dinitrotoluenedaily average≤ .014 lb/dall year001
2,6-Dinitrotoluenedaily maximum≤ .035 lb/dall year001
4-Nitrophenoldaily average≤ .004 lb/dall year001
4-Nitrophenoldaily maximum≤ .007 lb/dall year001
4,6-Dinitro-o-cresoldaily average≤ .004 lb/dall year001
4,6-Dinitro-o-cresoldaily maximum≤ .015 lb/dall year001
Phenoldaily average≤ .001 lb/dall year001
Phenoldaily maximum≤ .002 lb/dall year001
Naphthalenedaily average≤ .001 lb/dall year001
Naphthalenedaily maximum≤ .003 lb/dall year001
Di[2-ethylhexyl] phthalate [DEHP]daily average≤ .006 lb/dall year001
Di[2-ethylhexyl] phthalate [DEHP]daily maximum≤ .015 lb/dall year001
Di-n-butyl phthalatedaily average≤ .001 lb/dall year001
Di-n-butyl phthalatedaily maximum≤ .003 lb/dall year001
Vinyl chloridedaily average≤ .006 lb/dall year001
Vinyl chloridedaily maximum≤ .014 lb/dall year001
Trichloroethylenedaily average≤ .001 lb/dall year001
Trichloroethylenedaily maximum≤ .003 lb/dall year001
Hexachlorobenzenedaily averagereport only (mg/L)all year001
Hexachlorobenzenedaily maximumreport only (mg/L)all year001
Hexachlorobenzenedaily average≤ .00005 lb/dall year001
Hexachlorobenzenedaily maximum≤ .0001 lb/dall year001
Phenolsdaily average≤ .1 lb/dall year001
Phenolsdaily maximum≤ .3 lb/dall year001
Flow, in conduit or thru treatment plantdaily average≤ .114 MGDall year001
Flow, in conduit or thru treatment plantdaily maximum≤ .228 MGDall year001
1,3-Dichloropropylenedaily average≤ .002 lb/dall year001
1,3-Dichloropropylenedaily maximum≤ .003 lb/dall year001
Solids, total dissolveddaily averagereport only (mg/L)all year001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
3,4-Benzofluoranthenedaily average≤ .001 lb/dall year001
3,4-Benzofluoranthenedaily maximum≤ .003 lb/dall year001
Chloroethanedaily average≤ .006 lb/dall year001
Chloroethanedaily maximum≤ .014 lb/dall year001
Oxygen demand, chem. [high level] [COD]daily maximum≤ 200 mg/Lall year002
pHminimum≥ 6 SUall year002
pHmaximum≤ 9 SUall year002
Oil & Greasedaily maximum≤ 15 mg/Lall year002
Flow, in conduit or thru treatment plantdaily averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Oxygen demand, chem. [high level] [COD]daily maximum≤ 150 mg/Lall year003
pHminimum≥ 6 SUall year003
pHmaximum≤ 9 SUall year003
Oil & Greasedaily maximum≤ 15 mg/Lall year003
Benzene, ethylbenzene, toluene, xylene combinationdaily maximum≤ .5 mg/Lall year003
Benzenedaily maximum≤ .05 mg/Lall year003
Flow, in conduit or thru treatment plantdaily averagereport only (MGD)all year003
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year003
Oxygen demand, chem. [high level] [COD]daily maximum≤ 150 mg/Lall year004
pHminimum≥ 6 SUall year004
pHmaximum≤ 9 SUall year004
Oil & Greasedaily maximum≤ 15 mg/Lall year004
Benzene, ethylbenzene, toluene, xylene combinationdaily maximum≤ .5 mg/Lall year004
Benzenedaily maximum≤ .05 mg/Lall year004
Flow, in conduit or thru treatment plantdaily averagereport only (MGD)all year004
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year004
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
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

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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