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SWE, Inc. - Southwest Engineers

Chemical Preparations, Slidell, Louisiana. NPDES permit LA0101648, in force until Feb 28, 2028. Last 12 months: no values over a limit, 4 required values missing, 1 of 24 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form Q quarterly (12 values), outfall 004 form Q quarterly (6 values), outfall 006 form A quarterly (266 values), outfall 006 form Q quarterly (4 values), outfall 003 form S twice a year, outfall 005 form S twice a year
Renewal application due
Sep 1, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 0 of 28 reports late

Limits in force (312)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 45 mg/Lall year001
pHinstantaneous minimum≥ 6 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendeddaily maximum≤ 45 mg/Lall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (gal/d)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (gal/d)all year001
Enterococcimonthly average≤ 35 #/100mLall year001
Enterococcidaily maximum≤ 135 #/100mLall year001
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year001
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year003
BOD, 5-day, 20 deg. Cdaily maximum≤ 45 mg/Lall year003
pHinstantaneous minimum≥ 6 SUall year003
pHinstantaneous maximum≤ 9 SUall year003
Solids, total suspendedmonthly average≤ 30 mg/Lall year003
Solids, total suspendeddaily maximum≤ 45 mg/Lall year003
Flow, in conduit or thru treatment plantmonthly averagereport only (gal/d)all year003
Flow, in conduit or thru treatment plantdaily maximumreport only (gal/d)all year003
Enterococcimonthly average≤ 35 #/100mLall year003
Enterococcidaily maximum≤ 135 #/100mLall year003
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year003
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year003
pHinstantaneous minimum≥ 6 SUall year004
pHinstantaneous maximum≤ 9 SUall year004
Solids, total suspendedmonthly average≤ 30 mg/Lall year004
Solids, total suspendeddaily maximum≤ 45 mg/Lall year004
Flow, in conduit or thru treatment plantmonthly averagereport only (gal/d)all year004
Flow, in conduit or thru treatment plantdaily maximumreport only (gal/d)all year004
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year005
BOD, 5-day, 20 deg. Cdaily maximum≤ 45 mg/Lall year005
pHinstantaneous minimum≥ 6 SUall year005
pHinstantaneous maximum≤ 9 SUall year005
Solids, total suspendedmonthly average≤ 30 mg/Lall year005
Solids, total suspendeddaily maximum≤ 45 mg/Lall year005
Flow, in conduit or thru treatment plantmonthly averagereport only (gal/d)all year005
Flow, in conduit or thru treatment plantdaily maximumreport only (gal/d)all year005
Enterococcimonthly average≤ 35 #/100mLall year005
Enterococcidaily maximum≤ 135 #/100mLall year005
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year005
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year005
pHinstantaneous minimum≥ 6 SUall year006
pHinstantaneous minimum≥ 6 SUall year006
pHinstantaneous maximum≤ 9 SUall year006
pHinstantaneous maximum≤ 9 SUall year006
Oil & Greasedaily maximum≤ 15 mg/Lall year006
Oil & Greasedaily maximum≤ 15 mg/Lall year006
Nitrogen, total [as N]monthly averagereport only (mg/L)all year006
Nitrogen, total [as N]daily maximumreport only (mg/L)all year006
Phosphorus, total [as P]monthly averagereport only (mg/L)all year006
Phosphorus, total [as P]daily maximumreport only (mg/L)all year006
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year006
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year006
Cyanide, total [as CN]daily maximum≤ 100 ug/Lall year006
Cyanide, total [as CN]daily maximum≤ 100 ug/Lall year006
Arsenic, total [as As]daily maximum≤ 100 ug/Lall year006
Arsenic, total [as As]daily maximum≤ 100 ug/Lall year006
Beryllium, total [as Be]daily maximum≤ 100 ug/Lall year006
Beryllium, total [as Be]daily maximum≤ 100 ug/Lall year006
Cadmium, total [as Cd]daily maximum≤ 100 ug/Lall year006
Cadmium, total [as Cd]daily maximum≤ 100 ug/Lall year006
Chromium, total [as Cr]daily maximum≤ 150 ug/Lall year006
Chromium, total [as Cr]daily maximum≤ 150 ug/Lall year006
Copper, total [as Cu]daily maximum≤ 500 ug/Lall year006
Copper, total [as Cu]daily maximum≤ 500 ug/Lall year006
Lead, total [as Pb]daily maximum≤ 150 ug/Lall year006
Lead, total [as Pb]daily maximum≤ 150 ug/Lall year006
Thallium, total [as Tl]daily maximum≤ 100 ug/Lall year006
Thallium, total [as Tl]daily maximum≤ 100 ug/Lall year006
Nickel, total [as Ni]daily maximum≤ 500 ug/Lall year006
Nickel, total [as Ni]daily maximum≤ 500 ug/Lall year006
Silver, total [as Ag]daily maximum≤ 100 ug/Lall year006
Silver, total [as Ag]daily maximum≤ 100 ug/Lall year006
Zinc, total [as Zn]daily maximum≤ 1000 ug/Lall year006
Zinc, total [as Zn]daily maximum≤ 1000 ug/Lall year006
Antimony, total [as Sb]daily maximum≤ 600 ug/Lall year006
Antimony, total [as Sb]daily maximum≤ 600 ug/Lall year006
Selenium, total [as Se]daily maximum≤ 100 ug/Lall year006
Selenium, total [as Se]daily maximum≤ 100 ug/Lall year006
Dichlorobromomethanedaily maximum≤ 100 ug/Lall year006
Dichlorobromomethanedaily maximum≤ 100 ug/Lall year006
Carbon tetrachloridedaily maximum≤ 100 ug/Lall year006
Carbon tetrachloridedaily maximum≤ 100 ug/Lall year006
1,2-Dichloroethanedaily maximum≤ 100 ug/Lall year006
1,2-Dichloroethanedaily maximum≤ 100 ug/Lall year006
Bromoformdaily maximum≤ 100 ug/Lall year006
Bromoformdaily maximum≤ 100 ug/Lall year006
Dibromochloromethanedaily maximum≤ 100 ug/Lall year006
Dibromochloromethanedaily maximum≤ 100 ug/Lall year006
Chloroformdaily maximum≤ 100 ug/Lall year006
Chloroformdaily maximum≤ 100 ug/Lall year006
Phenolics, total recoverabledaily maximum≤ 500 ug/Lall year006
Phenolics, total recoverabledaily maximum≤ 500 ug/Lall year006
Toluenedaily maximum≤ 100 ug/Lall year006
Toluenedaily maximum≤ 100 ug/Lall year006
Benzenedaily maximum≤ 100 ug/Lall year006
Benzenedaily maximum≤ 100 ug/Lall year006
.delta.-BHCdaily maximum≤ 10 ug/Lall year006
.delta.-BHCdaily maximum≤ 10 ug/Lall year006
Acenaphthylenedaily maximum≤ 100 ug/Lall year006
Acenaphthylenedaily maximum≤ 100 ug/Lall year006
Acenaphthenedaily maximum≤ 100 ug/Lall year006
Acenaphthenedaily maximum≤ 100 ug/Lall year006
Acroleindaily maximum≤ 100 ug/Lall year006
Acroleindaily maximum≤ 100 ug/Lall year006
Acrylonitriledaily maximum≤ 100 ug/Lall year006
Acrylonitriledaily maximum≤ 100 ug/Lall year006
Anthracenedaily maximum≤ 100 ug/Lall year006
Anthracenedaily maximum≤ 100 ug/Lall year006
Benzo[b]fluoranthenedaily maximum≤ 100 ug/Lall year006
Benzo[b]fluoranthenedaily maximum≤ 100 ug/Lall year006
Benzo[k]fluoranthenedaily maximum≤ 100 ug/Lall year006
Benzo[k]fluoranthenedaily maximum≤ 100 ug/Lall year006
Benzo[a]pyrenedaily maximum≤ 100 ug/Lall year006
Benzo[a]pyrenedaily maximum≤ 100 ug/Lall year006
Bis[2-chloroethyl] etherdaily maximum≤ 100 ug/Lall year006
Bis[2-chloroethyl] etherdaily maximum≤ 100 ug/Lall year006
Bis[2-chloroethoxy]methanedaily maximum≤ 100 ug/Lall year006
Bis[2-chloroethoxy]methanedaily maximum≤ 100 ug/Lall year006
Bis[2-chloroisopropyl] etherdaily maximum≤ 100 ug/Lall year006
Bis[2-chloroisopropyl] etherdaily maximum≤ 100 ug/Lall year006
Butyl benzyl phthalatedaily maximum≤ 100 ug/Lall year006
Butyl benzyl phthalatedaily maximum≤ 100 ug/Lall year006
Chlorobenzenedaily maximum≤ 100 ug/Lall year006
Chlorobenzenedaily maximum≤ 100 ug/Lall year006
Chrysenedaily maximum≤ 100 ug/Lall year006
Chrysenedaily maximum≤ 100 ug/Lall year006
Diethyl phthalatedaily maximum≤ 100 ug/Lall year006
Diethyl phthalatedaily maximum≤ 100 ug/Lall year006
Dimethyl phthalatedaily maximum≤ 100 ug/Lall year006
Dimethyl phthalatedaily maximum≤ 100 ug/Lall year006
1,2-Diphenylhydrazinedaily maximum≤ 100 ug/Lall year006
1,2-Diphenylhydrazinedaily maximum≤ 100 ug/Lall year006
Endosulfan sulfatedaily maximum≤ 10 ug/Lall year006
Endosulfan sulfatedaily maximum≤ 10 ug/Lall year006
.beta.-Endosulfandaily maximum≤ 10 ug/Lall year006
.beta.-Endosulfandaily maximum≤ 10 ug/Lall year006
.alpha.-Endosulfandaily maximum≤ 10 ug/Lall year006
.alpha.-Endosulfandaily maximum≤ 10 ug/Lall year006
Endrin aldehydedaily maximum≤ 10 ug/Lall year006
Endrin aldehydedaily maximum≤ 10 ug/Lall year006
Ethylbenzenedaily maximum≤ 100 ug/Lall year006
Ethylbenzenedaily maximum≤ 100 ug/Lall year006
Fluoranthenedaily maximum≤ 100 ug/Lall year006
Fluoranthenedaily maximum≤ 100 ug/Lall year006
Fluorenedaily maximum≤ 100 ug/Lall year006
Fluorenedaily maximum≤ 100 ug/Lall year006
Hexachlorocyclopentadienedaily maximum≤ 100 ug/Lall year006
Hexachlorocyclopentadienedaily maximum≤ 100 ug/Lall year006
Hexachlorobutadienedaily maximum≤ 100 ug/Lall year006
Hexachlorobutadienedaily maximum≤ 100 ug/Lall year006
Hexachloroethanedaily maximum≤ 100 ug/Lall year006
Hexachloroethanedaily maximum≤ 100 ug/Lall year006
Indeno[1,2,3-cd]pyrenedaily maximum≤ 100 ug/Lall year006
Indeno[1,2,3-cd]pyrenedaily maximum≤ 100 ug/Lall year006
Isophoronedaily maximum≤ 100 ug/Lall year006
Isophoronedaily maximum≤ 100 ug/Lall year006
Methyl bromide [Bromomethane]daily maximum≤ 100 ug/Lall year006
Methyl bromide [Bromomethane]daily maximum≤ 100 ug/Lall year006
Methyl chloride [Chloromethane]daily maximum≤ 100 ug/Lall year006
Methyl chloride [Chloromethane]daily maximum≤ 100 ug/Lall year006
Methylene chloridedaily maximum≤ 100 ug/Lall year006
Methylene chloridedaily maximum≤ 100 ug/Lall year006
N-Nitrosodi-N-propylaminedaily maximum≤ 100 ug/Lall year006
N-Nitrosodi-N-propylaminedaily maximum≤ 100 ug/Lall year006
N-Nitrosodiphenylaminedaily maximum≤ 100 ug/Lall year006
N-Nitrosodiphenylaminedaily maximum≤ 100 ug/Lall year006
N-Nitrosodimethylamine [NDMA]daily maximum≤ 100 ug/Lall year006
N-Nitrosodimethylamine [NDMA]daily maximum≤ 100 ug/Lall year006
Nitrobenzenedaily maximum≤ 100 ug/Lall year006
Nitrobenzenedaily maximum≤ 100 ug/Lall year006
para-Chloro-meta-cresoldaily maximum≤ 100 ug/Lall year006
para-Chloro-meta-cresoldaily maximum≤ 100 ug/Lall year006
Phenanthrenedaily maximum≤ 100 ug/Lall year006
Phenanthrenedaily maximum≤ 100 ug/Lall year006
Pyrenedaily maximum≤ 100 ug/Lall year006
Pyrenedaily maximum≤ 100 ug/Lall year006
Tetrachloroethylenedaily maximum≤ 100 ug/Lall year006
Tetrachloroethylenedaily maximum≤ 100 ug/Lall year006
1,1-Dichloroethanedaily maximum≤ 100 ug/Lall year006
1,1-Dichloroethanedaily maximum≤ 100 ug/Lall year006
1,1-Dichloroethylenedaily maximum≤ 100 ug/Lall year006
1,1-Dichloroethylenedaily maximum≤ 100 ug/Lall year006
1,1,1-Trichloroethanedaily maximum≤ 100 ug/Lall year006
1,1,1-Trichloroethanedaily maximum≤ 100 ug/Lall year006
1,1,2-Trichloroethanedaily maximum≤ 100 ug/Lall year006
1,1,2-Trichloroethanedaily maximum≤ 100 ug/Lall year006
1,1,2,2-Tetrachloroethanedaily maximum≤ 100 ug/Lall year006
1,1,2,2-Tetrachloroethanedaily maximum≤ 100 ug/Lall year006
Benzo[ghi]perylenedaily maximum≤ 100 ug/Lall year006
Benzo[ghi]perylenedaily maximum≤ 100 ug/Lall year006
Benzo[a]anthracenedaily maximum≤ 100 ug/Lall year006
Benzo[a]anthracenedaily maximum≤ 100 ug/Lall year006
1,2-Dichlorobenzenedaily maximum≤ 100 ug/Lall year006
1,2-Dichlorobenzenedaily maximum≤ 100 ug/Lall year006
1,2-Dichloropropanedaily maximum≤ 100 ug/Lall year006
1,2-Dichloropropanedaily maximum≤ 100 ug/Lall year006
trans-1,2-Dichloroethylenedaily maximum≤ 100 ug/Lall year006
trans-1,2-Dichloroethylenedaily maximum≤ 100 ug/Lall year006
1,2,4-Trichlorobenzenedaily maximum≤ 100 ug/Lall year006
1,2,4-Trichlorobenzenedaily maximum≤ 100 ug/Lall year006
Dibenz[a,h]anthracenedaily maximum≤ 100 ug/Lall year006
Dibenz[a,h]anthracenedaily maximum≤ 100 ug/Lall year006
1,3-Dichlorobenzenedaily maximum≤ 100 ug/Lall year006
1,3-Dichlorobenzenedaily maximum≤ 100 ug/Lall year006
1,4-Dichlorobenzenedaily maximum≤ 100 ug/Lall year006
1,4-Dichlorobenzenedaily maximum≤ 100 ug/Lall year006
2-Chloroethyl vinyl ether, [mixed]daily maximum≤ 100 ug/Lall year006
2-Chloroethyl vinyl ether, [mixed]daily maximum≤ 100 ug/Lall year006
2-Chloronaphthalenedaily maximum≤ 100 ug/Lall year006
2-Chloronaphthalenedaily maximum≤ 100 ug/Lall year006
2-Chlorophenoldaily maximum≤ 100 ug/Lall year006
2-Chlorophenoldaily maximum≤ 100 ug/Lall year006
2-Nitrophenoldaily maximum≤ 100 ug/Lall year006
2-Nitrophenoldaily maximum≤ 100 ug/Lall year006
Di-n-octyl phthalatedaily maximum≤ 100 ug/Lall year006
Di-n-octyl phthalatedaily maximum≤ 100 ug/Lall year006
2,4-Dichlorophenoldaily maximum≤ 100 ug/Lall year006
2,4-Dichlorophenoldaily maximum≤ 100 ug/Lall year006
2,4-Dimethylphenoldaily maximum≤ 100 ug/Lall year006
2,4-Dimethylphenoldaily maximum≤ 100 ug/Lall year006
2,4-Dinitrotoluenedaily maximum≤ 100 ug/Lall year006
2,4-Dinitrotoluenedaily maximum≤ 100 ug/Lall year006
2,4-Dinitrophenoldaily maximum≤ 100 ug/Lall year006
2,4-Dinitrophenoldaily maximum≤ 100 ug/Lall year006
2,4,6-Trichlorophenoldaily maximum≤ 100 ug/Lall year006
2,4,6-Trichlorophenoldaily maximum≤ 100 ug/Lall year006
2,6-Dinitrotoluenedaily maximum≤ 100 ug/Lall year006
2,6-Dinitrotoluenedaily maximum≤ 100 ug/Lall year006
3,3'-Dichlorobenzidinedaily maximum≤ 100 ug/Lall year006
3,3'-Dichlorobenzidinedaily maximum≤ 100 ug/Lall year006
4-Bromophenyl phenyl etherdaily maximum≤ 100 ug/Lall year006
4-Bromophenyl phenyl etherdaily maximum≤ 100 ug/Lall year006
4-Chlorophenyl phenyl etherdaily maximum≤ 100 ug/Lall year006
4-Chlorophenyl phenyl etherdaily maximum≤ 100 ug/Lall year006
4-Nitrophenoldaily maximum≤ 100 ug/Lall year006
4-Nitrophenoldaily maximum≤ 100 ug/Lall year006
4,6-Dinitro-o-cresoldaily maximum≤ 100 ug/Lall year006
4,6-Dinitro-o-cresoldaily maximum≤ 100 ug/Lall year006
PCB-1016daily maximumreport only (ug/L)all year006
PCB-1016daily maximumreport only (ug/L)all year006
2,3,7,8-Tetrachlorodibenzo-p-dioxindaily maximum≤ 5 ug/Lall year006
2,3,7,8-Tetrachlorodibenzo-p-dioxindaily maximum≤ 5 ug/Lall year006
Phenoldaily maximum≤ 100 ug/Lall year006
Phenoldaily maximum≤ 100 ug/Lall year006
Naphthalenedaily maximum≤ 100 ug/Lall year006
Naphthalenedaily maximum≤ 100 ug/Lall year006
Pentachlorophenoldaily maximum≤ 100 ug/Lall year006
Pentachlorophenoldaily maximum≤ 100 ug/Lall year006
Di[2-ethylhexyl] phthalate [DEHP]daily maximum≤ 100 ug/Lall year006
Di[2-ethylhexyl] phthalate [DEHP]daily maximum≤ 100 ug/Lall year006
Di-n-butyl phthalatedaily maximum≤ 100 ug/Lall year006
Di-n-butyl phthalatedaily maximum≤ 100 ug/Lall year006
Benzidinedaily maximum≤ 100 ug/Lall year006
Benzidinedaily maximum≤ 100 ug/Lall year006
Vinyl chloridedaily maximum≤ 100 ug/Lall year006
Vinyl chloridedaily maximum≤ 100 ug/Lall year006
Trichloroethylenedaily maximum≤ 100 ug/Lall year006
Trichloroethylenedaily maximum≤ 100 ug/Lall year006
4,4'-DDTdaily maximum≤ 10 ug/Lall year006
4,4'-DDTdaily maximum≤ 10 ug/Lall year006
4,4'-DDDdaily maximum≤ 10 ug/Lall year006
4,4'-DDDdaily maximum≤ 10 ug/Lall year006
4,4'-DDEdaily maximum≤ 10 ug/Lall year006
4,4'-DDEdaily maximum≤ 10 ug/Lall year006
Aldrindaily maximum≤ 10 ug/Lall year006
Aldrindaily maximum≤ 10 ug/Lall year006
.alpha.-BHCdaily maximum≤ 10 ug/Lall year006
.alpha.-BHCdaily maximum≤ 10 ug/Lall year006
.beta.-BHCdaily maximum≤ 10 ug/kgall year006
.beta.-BHCdaily maximum≤ 10 ug/kgall year006
.gamma.-BHCdaily maximum≤ 10 ug/Lall year006
.gamma.-BHCdaily maximum≤ 10 ug/Lall year006
Dieldrindaily maximum≤ 10 ug/Lall year006
Dieldrindaily maximum≤ 10 ug/Lall year006
Endrindaily maximum≤ 5 ug/Lall year006
Endrindaily maximum≤ 5 ug/Lall year006
Toxaphenedaily maximum≤ 10 ug/Lall year006
Toxaphenedaily maximum≤ 10 ug/Lall year006
Heptachlordaily maximum≤ 10 ug/Lall year006
Heptachlordaily maximum≤ 10 ug/Lall year006
Heptachlor epoxidedaily maximum≤ 10 ug/Lall year006
Heptachlor epoxidedaily maximum≤ 10 ug/Lall year006
PCB-1221daily maximumreport only (ug/L)all year006
PCB-1221daily maximumreport only (ug/L)all year006
PCB-1232daily maximumreport only (ug/L)all year006
PCB-1232daily maximumreport only (ug/L)all year006
PCB-1242daily maximumreport only (ug/L)all year006
PCB-1242daily maximumreport only (ug/L)all year006
PCB-1248daily maximumreport only (ug/L)all year006
PCB-1248daily maximumreport only (ug/L)all year006
PCB-1254daily maximumreport only (ug/L)all year006
PCB-1254daily maximumreport only (ug/L)all year006
PCB-1260daily maximumreport only (ug/L)all year006
PCB-1260daily maximumreport only (ug/L)all year006
Hexachlorobenzenedaily maximum≤ 100 ug/Lall year006
Hexachlorobenzenedaily maximum≤ 100 ug/Lall year006
BTEXdaily maximum≤ 250 ug/Lall year006
BTEXdaily maximum≤ 250 ug/Lall year006
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year006
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year006
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year006
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year006
Chlordanedaily maximum≤ 10 ug/Lall year006
Chlordanedaily maximum≤ 10 ug/Lall year006
Mercury, total [as Hg]daily maximum≤ 10 ug/Lall year006
Mercury, total [as Hg]daily maximum≤ 10 ug/Lall year006
1,3-Dichloropropenedaily maximum≤ 100 ug/Lall year006
1,3-Dichloropropenedaily maximum≤ 100 ug/Lall year006
Chloroethanedaily maximum≤ 100 ug/Lall year006
Chloroethanedaily maximum≤ 100 ug/Lall year006

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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