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Lacc, LLC US - Ethylene & Derivatives Plant

Industrial Organic Chemicals, major discharger, Westlake, Louisiana. NPDES permit LA0127268, in force until Aug 31, 2031. Last 12 months: over a limit once (last December 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (10 values), outfall 005 form A monthly (11 values), outfall 001 form ME quarterly, outfall 001 form MY quarterly, outfall 001 form Q quarterly, outfall 001 form Y yearly, and 6 more forms
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 1 of 41 reports late

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

Period endingParameterReportedLimitOver by
December 2025Chloroform, monthly average.16 lb/d≤ .11 lb/d45%

Limits in force (189)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cmonthly average≤ 238 lb/dall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 634 lb/dall year001
pHminimumreport only (SU)all year001
pHmaximumreport only (SU)all year001
Solids, total suspendedmonthly average≤ 364 lb/dall year001
Solids, total suspendeddaily maximum≤ 1178 lb/dall year001
Copper, total [as Cu]monthly average≤ 1.21 lb/dall year001
Copper, total [as Cu]daily maximum≤ 2.88 lb/dall year001
Carbon tetrachloridemonthly average≤ .1 lb/dall year001
Carbon tetrachloridedaily maximum≤ .21 lb/dall year001
1,2-Dichloroethanemonthly average≤ .38 lb/dall year001
1,2-Dichloroethanedaily maximum≤ 1.19 lb/dall year001
Chloroformmonthly average≤ .12 lb/dall year001
Chloroformdaily maximum≤ .26 lb/dall year001
Toluenemonthly average≤ .15 lb/dall year001
Toluenedaily maximum≤ .45 lb/dall year001
Benzenemonthly average≤ .21 lb/dall year001
Benzenedaily maximum≤ .77 lb/dall year001
Acenaphthylenemonthly average≤ .12 lb/dall year001
Acenaphthylenedaily maximum≤ .33 lb/dall year001
Acenaphthenemonthly average≤ .12 lb/dall year001
Acenaphthenedaily maximum≤ .33 lb/dall year001
Acrylonitrilemonthly average≤ .54 lb/dall year001
Acrylonitriledaily maximum≤ 1.37 lb/dall year001
Anthracenemonthly average≤ .12 lb/dall year001
Anthracenedaily maximum≤ .33 lb/dall year001
Benzo[b]fluoranthenemonthly average≤ .13 lb/dall year001
Benzo[b]fluoranthenedaily maximum≤ .34 lb/dall year001
Benzo[k]fluoranthenemonthly average≤ .12 lb/dall year001
Benzo[k]fluoranthenedaily maximum≤ .33 lb/dall year001
Benzo[a]pyrenemonthly average≤ 5 ug/Lall year001
Benzo[a]pyrenedaily maximum≤ 5 ug/Lall year001
Chlorobenzenemonthly average≤ .08 lb/dall year001
Chlorobenzenedaily maximum≤ .16 lb/dall year001
Chrysenemonthly average≤ .12 lb/dall year001
Chrysenedaily maximum≤ .33 lb/dall year001
Diethyl phthalatemonthly average≤ .46 lb/dall year001
Diethyl phthalatedaily maximum≤ 1.15 lb/dall year001
Dimethyl phthalatemonthly average≤ .11 lb/dall year001
Dimethyl phthalatedaily maximum≤ .27 lb/dall year001
Ethylbenzenemonthly average≤ .18 lb/dall year001
Ethylbenzenedaily maximum≤ .61 lb/dall year001
Fluoranthenemonthly average≤ .14 lb/dall year001
Fluoranthenedaily maximum≤ .38 lb/dall year001
Fluorenemonthly average≤ .12 lb/dall year001
Fluorenedaily maximum≤ .33 lb/dall year001
Hexachlorobutadienemonthly average≤ .11 lb/dall year001
Hexachlorobutadienedaily maximum≤ .28 lb/dall year001
Hexachloroethanemonthly average≤ .12 lb/dall year001
Hexachloroethanedaily maximum≤ .31 lb/dall year001
Methyl chloride [Chloromethane]monthly average≤ .49 lb/dall year001
Methyl chloride [Chloromethane]daily maximum≤ 1.07 lb/dall year001
Methylene chloridemonthly average≤ .23 lb/dall year001
Methylene chloridedaily maximum≤ .5 lb/dall year001
Nitrobenzenemonthly average≤ .15 lb/dall year001
Nitrobenzenedaily maximum≤ .38 lb/dall year001
Phenanthrenemonthly average≤ .12 lb/dall year001
Phenanthrenedaily maximum≤ .33 lb/dall year001
Pyrenemonthly average≤ .14 lb/dall year001
Pyrenedaily maximum≤ .38 lb/dall year001
Tetrachloroethylenemonthly average≤ .12 lb/dall year001
Tetrachloroethylenedaily maximum≤ .32 lb/dall year001
1,1-Dichloroethanemonthly average≤ .12 lb/dall year001
1,1-Dichloroethanedaily maximum≤ .33 lb/dall year001
1,1-Dichloroethylenemonthly average≤ .09 lb/dall year001
1,1-Dichloroethylenedaily maximum≤ .14 lb/dall year001
1,1,1-Trichloroethanemonthly average≤ .12 lb/dall year001
1,1,1-Trichloroethanedaily maximum≤ .31 lb/dall year001
1,1,2-Trichloroethanemonthly average≤ .12 lb/dall year001
1,1,2-Trichloroethanedaily maximum≤ .31 lb/dall year001
Benzo[a]anthracenemonthly average≤ 5 ug/Lall year001
Benzo[a]anthracenedaily maximum≤ 5 ug/Lall year001
1,2-Dichlorobenzenemonthly average≤ .44 lb/dall year001
1,2-Dichlorobenzenedaily maximum≤ .92 lb/dall year001
1,2-Dichloropropanemonthly average≤ .87 lb/dall year001
1,2-Dichloropropanedaily maximum≤ 1.3 lb/dall year001
trans-1,2-Dichloroethylenemonthly average≤ .12 lb/dall year001
trans-1,2-Dichloroethylenedaily maximum≤ .31 lb/dall year001
1,2,4-Trichlorobenzenemonthly average≤ .38 lb/dall year001
1,2,4-Trichlorobenzenedaily maximum≤ .79 lb/dall year001
1,3-Dichlorobenzenemonthly average≤ .18 lb/dall year001
1,3-Dichlorobenzenedaily maximum≤ .25 lb/dall year001
1,4-Dichlorobenzenemonthly average≤ .08 lb/dall year001
1,4-Dichlorobenzenedaily maximum≤ .16 lb/dall year001
2-Chlorophenolmonthly average≤ .18 lb/dall year001
2-Chlorophenoldaily maximum≤ .55 lb/dall year001
2-Nitrophenolmonthly average≤ .23 lb/dall year001
2-Nitrophenoldaily maximum≤ .39 lb/dall year001
2,4-Dichlorophenolmonthly average≤ .22 lb/dall year001
2,4-Dichlorophenoldaily maximum≤ .63 lb/dall year001
2,4-Dimethylphenolmonthly average≤ .1 lb/dall year001
2,4-Dimethylphenoldaily maximum≤ .2 lb/dall year001
2,4-Dinitrotoluenemonthly average≤ .64 lb/dall year001
2,4-Dinitrotoluenedaily maximum≤ 1.61 lb/dall year001
2,4-Dinitrophenolmonthly average≤ .4 lb/dall year001
2,4-Dinitrophenoldaily maximum≤ .7 lb/dall year001
2,6-Dinitrotoluenemonthly average≤ 1.44 lb/dall year001
2,6-Dinitrotoluenedaily maximum≤ 3.62 lb/dall year001
4-Nitrophenolmonthly average≤ .41 lb/dall year001
4-Nitrophenoldaily maximum≤ .7 lb/dall year001
4,6-Dinitro-o-cresolmonthly average≤ .44 lb/dall year001
4,6-Dinitro-o-cresoldaily maximum≤ 1.57 lb/dall year001
Phenolmonthly average≤ .08 lb/dall year001
Phenoldaily maximum≤ .15 lb/dall year001
Naphthalenemonthly average≤ .12 lb/dall year001
Naphthalenedaily maximum≤ .33 lb/dall year001
Di[2-ethylhexyl] phthalate [DEHP]monthly average≤ .58 lb/dall year001
Di[2-ethylhexyl] phthalate [DEHP]daily maximum≤ 1.58 lb/dall year001
Di-n-butyl phthalatemonthly average≤ .15 lb/dall year001
Di-n-butyl phthalatedaily maximum≤ .32 lb/dall year001
Vinyl chloridemonthly average≤ .59 lb/dall year001
Vinyl chloridedaily maximum≤ 1.52 lb/dall year001
Trichloroethylenemonthly average≤ .12 lb/dall year001
Trichloroethylenedaily maximum≤ .31 lb/dall year001
Hexachlorobenzenemonthly average≤ .01 lb/dall year001
Hexachlorobenzenedaily maximum≤ .024 lb/dall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
1,3-Dichloropropylenemonthly average≤ .16 lb/dall year001
1,3-Dichloropropylenedaily maximum≤ .25 lb/dall year001
pH range excursions, > 60 minutesdaily maximum≤ 0 occur/moall year001
pH range excursions, monthly total accumdaily maximum≤ 446 minall year001
Chloroethanemonthly average≤ .59 lb/dall year001
Chloroethanedaily maximum≤ 1.52 lb/dall year001
Pass/Fail Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)monthly average minimumreport only (pass=0;fail=1)all year001
Pass/Fail Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7-day minimumreport only (pass=0;fail=1)all year001
Pass/Fail Static Renewal 7 Day Chronic Menidia beryllinamonthly average minimumreport only (pass=0;fail=1)all year001
Pass/Fail Static Renewal 7 Day Chronic Menidia beryllina7-day minimumreport only (pass=0;fail=1)all year001
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)monthly average minimumreport only (pass=0;fail=1)all year001
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)7-day minimumreport only (pass=0;fail=1)all year001
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia beryllinamonthly average minimumreport only (pass=0;fail=1)all year001
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia beryllina7-day minimumreport only (pass=0;fail=1)all year001
NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)monthly average minimumreport only (%)all year001
NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7-day minimumreport only (%)all year001
NOEC Lethal Static Renewal 7 Day Chronic Menidia beryllinamonthly average minimumreport only (%)all year001
NOEC Lethal Static Renewal 7 Day Chronic Menidia beryllina7-day minimumreport only (%)all year001
NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)monthly average minimumreport only (%)all year001
NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7-day minimumreport only (%)all year001
NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllinamonthly average minimumreport only (%)all year001
NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina7-day minimumreport only (%)all year001
Coef Of Var Static Renewal 7Day Chronic Americamysis bahia (formerly Mysidopsis bahia)maximumreport only (%)all year001
Coef Of Var Static Renewal 7Day Chronic Menidia beryllinamaximumreport only (%)all year001
pHinstantaneous minimum≥ 6 SUall year002
pHinstantaneous maximum≤ 8.5 SUall year002
Oil & Greasedaily maximum≤ 15 mg/Lall year002
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year002
Hexachlorobutadienemonthly averagereport only (mg/L)all year002
Hexachlorobutadienedaily maximumreport only (mg/L)all year002
PCB-1254monthly averagereport only (mg/L)all year002
PCB-1254daily maximumreport only (mg/L)all year002
Hexachlorobenzenemonthly averagereport only (mg/L)all year002
Hexachlorobenzenedaily maximumreport only (mg/L)all year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
pHinstantaneous minimum≥ 6 SUall year003
pHinstantaneous maximum≤ 8.5 SUall year003
Oil & Greasedaily maximum≤ 15 mg/Lall year003
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year003
Hexachlorobutadienemonthly averagereport only (mg/L)all year003
Hexachlorobutadienedaily maximumreport only (mg/L)all year003
PCB-1254monthly averagereport only (mg/L)all year003
PCB-1254daily maximumreport only (mg/L)all year003
Hexachlorobenzenemonthly averagereport only (mg/L)all year003
Hexachlorobenzenedaily maximumreport only (mg/L)all year003
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year003
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year003
pHinstantaneous minimum≥ 6 SUall year004
pHinstantaneous maximum≤ 8.5 SUall year004
Oil & Greasedaily maximum≤ 15 mg/Lall year004
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year004
Hexachlorobutadienemonthly averagereport only (mg/L)all year004
Hexachlorobutadienedaily maximumreport only (mg/L)all year004
PCB-1254monthly averagereport only (mg/L)all year004
PCB-1254daily maximumreport only (mg/L)all year004
Hexachlorobenzenemonthly averagereport only (mg/L)all year004
Hexachlorobenzenedaily maximumreport only (mg/L)all year004
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year004
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year004
pHinstantaneous minimum≥ 6 SUall year005
pHinstantaneous maximum≤ 8.5 SUall year005
Solids, total suspendeddaily maximum≤ 90 mg/Lall year005
Solids, total suspendeddaily maximum≤ 90 mg/Lall year005
Oil & Greasedaily maximum≤ 15 mg/Lall year005
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year005
Lead, total [as Pb]daily maximum≤ 50 ug/Lall year005
Benzenedaily maximum≤ 50 ug/Lall year005
BTEXdaily maximum≤ 250 ug/Lall year005
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year005
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year005

How strict are these limits?

Cited limits by parameter: Louisiana's rules and the federal ones.

Same industry: the 130 Chemicals and Allied Products permits in Louisiana.

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