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Cornerstone Chemical Company

Industrial Organic Chemicals, major discharger, Westwego, Louisiana. NPDES permit LA0004367 expired Oct 31, 2026. Last 12 months: over a limit 2 times (last August 2026), 9 required values missing, 1 of 61 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (52 values), outfall 001 form Q quarterly (4 values), outfall 002 form A monthly (9 values), outfall 002B form A monthly (9 values), outfall 003 form A monthly (2 values), outfall IT01 form A monthly (2 values), and 3 more forms
Last report on file
August 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 1 of 67 reports late

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

Period endingParameterReportedLimitOver by
March 2026Copper, total [as Cu], monthly average13.1 lb/d≤ 6.16 lb/d113%
August 2026Coliform, fecal general, daily maximum830 #/100mL≤ 400 #/100mL108%

Limits in force (202)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cmonthly average≤ 726 lb/dall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 726 lb/dall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 1920 lb/dall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 1920 lb/dall year001
pHinstantaneous minimumreport only (SU)all year001
pHinstantaneous minimumreport only (SU)all year001
pHinstantaneous maximumreport only (SU)all year001
pHinstantaneous maximumreport only (SU)all year001
Solids, total suspendedmonthly average≤ 1548 lb/dall year001
Solids, total suspendedmonthly average≤ 1548 lb/dall year001
Solids, total suspendeddaily maximum≤ 4959 lb/dall year001
Solids, total suspendeddaily maximum≤ 4959 lb/dall year001
Oil & Greasemonthly average≤ 336 lb/dall year001
Oil & Greasemonthly average≤ 336 lb/dall year001
Oil & Greasedaily maximum≤ 503 lb/dall year001
Oil & Greasedaily maximum≤ 503 lb/dall year001
Nitrogen, organic total [as N]monthly average≤ 3000 lb/dall year001
Nitrogen, organic total [as N]monthly average≤ 3000 lb/dall year001
Nitrogen, organic total [as N]daily maximum≤ 9000 lb/dall year001
Nitrogen, organic total [as N]daily maximum≤ 9000 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 3018 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 3018 lb/dall year001
Nitrogen, ammonia total [as N]daily maximum≤ 6416 lb/dall year001
Nitrogen, ammonia total [as N]daily maximum≤ 6416 lb/dall year001
Phosphorus, total [as P]monthly averagereport only (lb/d)all year001
Phosphorus, total [as P]monthly averagereport only (lb/d)all year001
Phosphorus, total [as P]daily maximumreport only (lb/d)all year001
Phosphorus, total [as P]daily maximumreport only (lb/d)all year001
Cyanide, total [as CN]monthly average≤ 9.13 lb/dall year001
Cyanide, total [as CN]monthly average≤ 9.13 lb/dall year001
Cyanide, total [as CN]daily maximum≤ 26.08 lb/dall year001
Cyanide, total [as CN]daily maximum≤ 26.08 lb/dall year001
Copper, total [as Cu]monthly average≤ 6.16 lb/dall year001
Copper, total [as Cu]monthly average≤ 6.16 lb/dall year001
Copper, total [as Cu]daily maximum≤ 14.35 lb/dall year001
Copper, total [as Cu]daily maximum≤ 14.35 lb/dall year001
Nickel, total [as Ni]monthly average≤ 7.17 lb/dall year001
Nickel, total [as Ni]monthly average≤ 7.17 lb/dall year001
Nickel, total [as Ni]daily maximum≤ 16.9 lb/dall year001
Nickel, total [as Ni]daily maximum≤ 16.9 lb/dall year001
Zinc, total [as Zn]monthly average≤ 12.67 lb/dall year001
Zinc, total [as Zn]monthly average≤ 12.67 lb/dall year001
Zinc, total [as Zn]daily maximum≤ 31.49 lb/dall year001
Zinc, total [as Zn]daily maximum≤ 31.49 lb/dall year001
Carbon tetrachloridemonthly average≤ 1.58 lb/dall year001
Carbon tetrachloridedaily maximum≤ 4.22 lb/dall year001
1,2-Dichloroethanemonthly average≤ 2 lb/dall year001
1,2-Dichloroethanedaily maximum≤ 6.38 lb/dall year001
Chloroformmonthly average≤ 1.23 lb/dall year001
Chloroformdaily maximum≤ 3.61 lb/dall year001
Toluenemonthly average≤ .31 lb/dall year001
Toluenedaily maximum≤ .82 lb/dall year001
Benzenemonthly average≤ .63 lb/dall year001
Benzenedaily maximum≤ 1.49 lb/dall year001
Acenaphthylenemonthly average≤ .21 lb/dall year001
Acenaphthylenedaily maximum≤ .52 lb/dall year001
Acenaphthenemonthly average≤ .21 lb/dall year001
Acenaphthenedaily maximum≤ .52 lb/dall year001
Acrylonitrilemonthly average≤ 1.04 lb/dall year001
Acrylonitriledaily maximum≤ 2.58 lb/dall year001
Anthracenemonthly average≤ .21 lb/dall year001
Anthracenedaily maximum≤ .52 lb/dall year001
Benzo[b]fluoranthenemonthly average≤ .22 lb/dall year001
Benzo[b]fluoranthenedaily maximum≤ .53 lb/dall year001
Benzo[k]fluoranthenemonthly average≤ .21 lb/dall year001
Benzo[k]fluoranthenedaily maximum≤ .52 lb/dall year001
Benzo[a]pyrenemonthly average≤ .22 lb/dall year001
Benzo[a]pyrenedaily maximum≤ .53 lb/dall year001
Chlorobenzenemonthly average≤ 1.58 lb/dall year001
Chlorobenzenedaily maximum≤ 4.22 lb/dall year001
Chrysenemonthly average≤ .21 lb/dall year001
Chrysenedaily maximum≤ .52 lb/dall year001
Diethyl phthalatemonthly average≤ .51 lb/dall year001
Diethyl phthalatedaily maximum≤ 1.26 lb/dall year001
Dimethyl phthalatemonthly average≤ .21 lb/dall year001
Dimethyl phthalatedaily maximum≤ .52 lb/dall year001
Ethylbenzenemonthly average≤ 1.58 lb/dall year001
Ethylbenzenedaily maximum≤ 4.22 lb/dall year001
Fluoranthenemonthly average≤ .24 lb/dall year001
Fluoranthenedaily maximum≤ .6 lb/dall year001
Fluorenemonthly average≤ .21 lb/dall year001
Fluorenedaily maximum≤ .52 lb/dall year001
Hexachlorobutadienemonthly average≤ 1.58 lb/dall year001
Hexachlorobutadienedaily maximum≤ 4.22 lb/dall year001
Hexachloroethanemonthly average≤ 2.18 lb/dall year001
Hexachloroethanedaily maximum≤ 8.83 lb/dall year001
Methyl chloride [Chloromethane]monthly average≤ 1.22 lb/dall year001
Methyl chloride [Chloromethane]daily maximum≤ 3.28 lb/dall year001
Methylene chloridemonthly average≤ .4 lb/dall year001
Methylene chloridedaily maximum≤ 1.89 lb/dall year001
Nitrobenzenemonthly average≤ 24.86 lb/dall year001
Nitrobenzenedaily maximum≤ 71.16 lb/dall year001
Phenanthrenemonthly average≤ .21 lb/dall year001
Phenanthrenedaily maximum≤ .52 lb/dall year001
Pyrenemonthly average≤ .22 lb/dall year001
Pyrenedaily maximum≤ .53 lb/dall year001
Tetrachloroethylenemonthly average≤ .58 lb/dall year001
Tetrachloroethylenedaily maximum≤ 1.82 lb/dall year001
1,1-Dichloroethanemonthly average≤ .24 lb/dall year001
1,1-Dichloroethanedaily maximum≤ .66 lb/dall year001
1,1-Dichloroethylenemonthly average≤ .24 lb/dall year001
1,1-Dichloroethylenedaily maximum≤ .67 lb/dall year001
1,1,1-Trichloroethanemonthly average≤ .24 lb/dall year001
1,1,1-Trichloroethanedaily maximum≤ .66 lb/dall year001
1,1,2-Trichloroethanemonthly average≤ .36 lb/dall year001
1,1,2-Trichloroethanedaily maximum≤ 1.41 lb/dall year001
Benzo[a]anthracenemonthly average≤ .21 lb/dall year001
Benzo[a]anthracenedaily maximum≤ .52 lb/dall year001
1,2-Dichlorobenzenemonthly average≤ 2.18 lb/dall year001
1,2-Dichlorobenzenedaily maximum≤ 8.83 lb/dall year001
1,2-Dichloropropanemonthly average≤ 2.18 lb/dall year001
1,2-Dichloropropanedaily maximum≤ 8.83 lb/dall year001
trans-1,2-Dichloroethylenemonthly average≤ .28 lb/dall year001
trans-1,2-Dichloroethylenedaily maximum≤ .73 lb/dall year001
1,2,4-Trichlorobenzenemonthly average≤ 2.18 lb/dall year001
1,2,4-Trichlorobenzenedaily maximum≤ 8.83 lb/dall year001
1,3-Dichlorobenzenemonthly average≤ 1.58 lb/dall year001
1,3-Dichlorobenzenedaily maximum≤ 4.22 lb/dall year001
1,4-Dichlorobenzenemonthly average≤ 1.58 lb/dall year001
1,4-Dichlorobenzenedaily maximum≤ 4.22 lb/dall year001
2-Nitrophenolmonthly average≤ .72 lb/dall year001
2-Nitrophenoldaily maximum≤ 2.57 lb/dall year001
2,4-Dimethylphenolmonthly average≤ .21 lb/dall year001
2,4-Dimethylphenoldaily maximum≤ .52 lb/dall year001
2,4-Dinitrophenolmonthly average≤ 13.42 lb/dall year001
2,4-Dinitrophenoldaily maximum≤ 47.69 lb/dall year001
4-Nitrophenolmonthly average≤ 1.8 lb/dall year001
4-Nitrophenoldaily maximum≤ 6.4 lb/dall year001
4,6-Dinitro-o-cresolmonthly average≤ .87 lb/dall year001
4,6-Dinitro-o-cresoldaily maximum≤ 3.08 lb/dall year001
Phenolmonthly average≤ .21 lb/dall year001
Phenoldaily maximum≤ .52 lb/dall year001
Naphthalenemonthly average≤ .21 lb/dall year001
Naphthalenedaily maximum≤ .52 lb/dall year001
Di[2-ethylhexyl] phthalate [DEHP]monthly average≤ 1.06 lb/dall year001
Di[2-ethylhexyl] phthalate [DEHP]daily maximum≤ 2.87 lb/dall year001
Di-n-butyl phthalatemonthly average≤ .22 lb/dall year001
Di-n-butyl phthalatedaily maximum≤ .48 lb/dall year001
Vinyl chloridemonthly average≤ 1.08 lb/dall year001
Vinyl chloridedaily maximum≤ 1.91 lb/dall year001
Trichloroethylenemonthly average≤ .29 lb/dall year001
Trichloroethylenedaily maximum≤ .77 lb/dall year001
Hexachlorobenzenemonthly average≤ .57 lb/dall year001
Hexachlorobenzenedaily maximum≤ 1.37 lb/dall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all 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
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
1,3-Dichloropropylenemonthly average≤ 2.18 lb/dall year001
1,3-Dichloropropylenedaily maximum≤ 8.83 lb/dall year001
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year001
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year001
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year001
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year001
pH range excursions, > 60 minutesmonthly total≤ 0 occur/moall year001
pH range excursions, > 60 minutesmonthly total≤ 0 occur/moall year001
pH range excursions, monthly total accummonthly total≤ 446 minall year001
pH range excursions, monthly total accummonthly total≤ 446 minall year001
Chloroethanemonthly average≤ 1.22 lb/dall year001
Chloroethanedaily maximum≤ 3.28 lb/dall year001
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulexmonthly average minimumreport only (pass=0;fail=1)all year001
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulexmonthly average minimumreport only (pass=0;fail=1)all year001
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex48-hour minimumreport only (pass=0;fail=1)all year001
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex48-hour minimumreport only (pass=0;fail=1)all year001
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all year001
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all year001
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas48-hour minimumreport only (pass=0;fail=1)all year001
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas48-hour minimumreport only (pass=0;fail=1)all year001
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulexmonthly average minimumreport only (%)all year001
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulexmonthly average minimumreport only (%)all year001
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex48-hour minimumreport only (%)all year001
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex48-hour minimumreport only (%)all year001
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelasmonthly average minimumreport only (%)all year001
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelasmonthly average minimumreport only (%)all year001
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas48-hour minimumreport only (%)all year001
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas48-hour minimumreport only (%)all year001
Coef Of Var Static Renewal 48Hr Acute D. pulexmaximumreport only (%)all year001
Coef Of Var Static Renewal 48Hr Acute D. pulexmaximumreport only (%)all year001
Coef Of Var Static Renewal 48Hr Acute Pimephales promelasmaximumreport only (%)all year001
Coef Of Var Static Renewal 48Hr Acute Pimephales promelasmaximumreport only (%)all year001
Oxygen demand, chem. [high level] [COD]daily maximum≤ 150 mg/Lall year002
pHinstantaneous minimum≥ 6 SUall year002
pHinstantaneous maximum≤ 9 SUall year002
Oil & Greasedaily maximum≤ 15 mg/Lall year002
Nitrogen, ammonia total [as N]daily maximum≤ 25 mg/Lall year002
Phosphorus, total [as P]monthly averagereport only (mg/L)all year002
Phosphorus, total [as P]daily 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
Oxygen demand, chem. [high level] [COD]daily maximum≤ 150 mg/Lall year002B
pHinstantaneous minimum≥ 6 SUall year002B
pHinstantaneous maximum≤ 9 SUall year002B
Oil & Greasedaily maximum≤ 15 mg/Lall year002B
Nitrogen, ammonia total [as N]daily maximum≤ 25 mg/Lall year002B
Phosphorus, total [as P]monthly averagereport only (mg/L)all year002B
Phosphorus, total [as P]daily maximumreport only (mg/L)all year002B
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002B
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002B
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year003
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year003
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearIT01
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearIT01

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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