Aurorium Denham Springs LLC — NPDES permit LA0048704: limits, due date and EPA's record

Chemical Preparations, Denham Springs, Louisiana. NPDES permit LA0048704, in force until Jan 31, 2029. Last 12 months: over a limit once (last June 2026). Source: EPA ECHO, Oct 22, 2026.

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

Period ending	Parameter	Reported	Limit	Over by
June 2026	Oil & Grease, daily maximum	20.9 mg/L	≤ 15 mg/L	39%

Limits in force (181)

Parameter	Statistic	Limit	Months	Outfall
Temperature, water deg. fahrenheit	instantaneous maximum	≤ 90 deg F	all year	002
Temperature, water deg. fahrenheit	instantaneous maximum	≤ 90 deg F	all year	002
pH	instantaneous minimum	≥ 6 SU	all year	002
pH	instantaneous minimum	≥ 6 SU	all year	002
pH	instantaneous maximum	≤ 9 SU	all year	002
pH	instantaneous maximum	≤ 9 SU	all year	002
Oil & Grease	daily maximum	≤ 15 mg/L	all year	002
Carbon, tot organic [TOC]	daily maximum	≤ 50 mg/L	all year	002
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	002
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	002
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	002
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	002
Chlorine, total residual	daily maximum	report only (mg/L)	all year	002
Temperature, water deg. fahrenheit	instantaneous maximum	≤ 90 deg F	all year	003
Temperature, water deg. fahrenheit	instantaneous maximum	≤ 90 deg F	all year	003
Oxygen, dissolved [DO]	monthly average minimum	≥ 5 mg/L	all year	003
BOD, 5-day, 20 deg. C	monthly average	≤ 3.31 lb/d	all year	003
BOD, 5-day, 20 deg. C	monthly average	≤ 3.31 lb/d	all year	003
BOD, 5-day, 20 deg. C	daily maximum	≤ 8.75 lb/d	all year	003
BOD, 5-day, 20 deg. C	daily maximum	≤ 8.75 lb/d	all year	003
pH	instantaneous minimum	≥ 6 SU	all year	003
pH	instantaneous minimum	≥ 6 SU	all year	003
pH	instantaneous maximum	≤ 9 SU	all year	003
pH	instantaneous maximum	≤ 9 SU	all year	003
Solids, total suspended	monthly average	≤ 4.3 lb/d	all year	003
Solids, total suspended	monthly average	≤ 4.3 lb/d	all year	003
Solids, total suspended	daily maximum	≤ 13.46 lb/d	all year	003
Solids, total suspended	daily maximum	≤ 13.46 lb/d	all year	003
Nitrogen, total [as N]	monthly average	report only (mg/L)	all year	003
Nitrogen, total [as N]	daily maximum	report only (mg/L)	all year	003
Nitrogen, ammonia total [as N]	monthly average	≤ .31 lb/d	all year	003
Nitrogen, ammonia total [as N]	monthly average	≤ .31 lb/d	all year	003
Nitrogen, ammonia total [as N]	daily maximum	≤ .62 lb/d	all year	003
Nitrogen, ammonia total [as N]	daily maximum	≤ .62 lb/d	all year	003
Phosphorus, total [as P]	monthly average	report only (mg/L)	all year	003
Phosphorus, total [as P]	daily maximum	report only (mg/L)	all year	003
Zinc, total [as Zn]	monthly average	report only (lb/d)	all year	003
Zinc, total [as Zn]	daily maximum	report only (lb/d)	all year	003
Carbon tetrachloride	monthly average	≤ .001 lb/d	all year	003
Carbon tetrachloride	daily maximum	≤ .003 lb/d	all year	003
1,2-Dichloroethane	monthly average	≤ .005 lb/d	all year	003
1,2-Dichloroethane	daily maximum	≤ .015 lb/d	all year	003
Chloroform	monthly average	≤ .001 lb/d	all year	003
Chloroform	daily maximum	≤ .003 lb/d	all year	003
Toluene	monthly average	≤ .002 lb/d	all year	003
Toluene	daily maximum	≤ .006 lb/d	all year	003
Benzene	monthly average	≤ .003 lb/d	all year	003
Benzene	daily maximum	≤ .01 lb/d	all year	003
Acenaphthylene	monthly average	≤ .002 lb/d	all year	003
Acenaphthylene	daily maximum	≤ .004 lb/d	all year	003
Acenaphthene	monthly average	≤ .002 lb/d	all year	003
Acenaphthene	daily maximum	≤ .004 lb/d	all year	003
Acrylonitrile	monthly average	≤ .007 lb/d	all year	003
Acrylonitrile	daily maximum	≤ .017 lb/d	all year	003
Anthracene	monthly average	≤ .002 lb/d	all year	003
Anthracene	daily maximum	≤ .004 lb/d	all year	003
Benzo[b]fluoranthene	monthly average	≤ .002 lb/d	all year	003
Benzo[b]fluoranthene	daily maximum	≤ .004 lb/d	all year	003
Benzo[k]fluoranthene	monthly average	≤ .002 lb/d	all year	003
Benzo[k]fluoranthene	daily maximum	≤ .004 lb/d	all year	003
Benzo[a]pyrene	monthly average	≤ .002 lb/d	all year	003
Benzo[a]pyrene	daily maximum	≤ .004 lb/d	all year	003
Chlorobenzene	monthly average	≤ .0011 lb/d	all year	003
Chlorobenzene	daily maximum	≤ .002 lb/d	all year	003
Chrysene	monthly average	≤ .002 lb/d	all year	003
Chrysene	daily maximum	≤ .004 lb/d	all year	003
Diethyl phthalate	monthly average	≤ .006 lb/d	all year	003
Diethyl phthalate	daily maximum	≤ .014 lb/d	all year	003
Dimethyl phthalate	monthly average	≤ .001 lb/d	all year	003
Dimethyl phthalate	daily maximum	≤ .003 lb/d	all year	003
Ethylbenzene	monthly average	≤ .002 lb/d	all year	003
Ethylbenzene	daily maximum	≤ .005 lb/d	all year	003
Fluoranthene	monthly average	≤ .001 lb/d	all year	003
Fluoranthene	daily maximum	≤ .003 lb/d	all year	003
Fluorene	monthly average	≤ .002 lb/d	all year	003
Fluorene	daily maximum	≤ .004 lb/d	all year	003
Hexachlorobutadiene	monthly average	≤ .0004 lb/d	all year	003
Hexachlorobutadiene	daily maximum	≤ .0009 lb/d	all year	003
Hexachloroethane	monthly average	≤ .001 lb/d	all year	003
Hexachloroethane	daily maximum	≤ .004 lb/d	all year	003
Methyl chloride [Chloromethane]	monthly average	≤ .006 lb/d	all year	003
Methyl chloride [Chloromethane]	daily maximum	≤ .014 lb/d	all year	003
Methylene chloride	monthly average	≤ .003 lb/d	all year	003
Methylene chloride	daily maximum	≤ .006 lb/d	all year	003
Nitrobenzene	monthly average	≤ .002 lb/d	all year	003
Nitrobenzene	daily maximum	≤ .005 lb/d	all year	003
Phenanthrene	monthly average	≤ .002 lb/d	all year	003
Phenanthrene	daily maximum	≤ .004 lb/d	all year	003
Pyrene	monthly average	≤ .002 lb/d	all year	003
Pyrene	daily maximum	≤ .005 lb/d	all year	003
Tetrachloroethylene	monthly average	≤ .002 lb/d	all year	003
Tetrachloroethylene	daily maximum	≤ .004 lb/d	all year	003
1,1-Dichloroethane	monthly average	≤ .002 lb/d	all year	003
1,1-Dichloroethane	daily maximum	≤ .004 lb/d	all year	003
1,1-Dichloroethylene	monthly average	≤ .0011 lb/d	all year	003
1,1-Dichloroethylene	daily maximum	≤ .002 lb/d	all year	003
1,1,1-Trichloroethane	monthly average	≤ .001 lb/d	all year	003
1,1,1-Trichloroethane	daily maximum	≤ .004 lb/d	all year	003
1,1,2-Trichloroethane	monthly average	≤ .001 lb/d	all year	003
1,1,2-Trichloroethane	daily maximum	≤ .004 lb/d	all year	003
Benzo[a]anthracene	monthly average	≤ .002 lb/d	all year	003
Benzo[a]anthracene	daily maximum	≤ .004 lb/d	all year	003
1,2-Dichlorobenzene	monthly average	≤ .005 lb/d	all year	003
1,2-Dichlorobenzene	daily maximum	≤ .012 lb/d	all year	003
1,2-Dichloropropane	monthly average	≤ .011 lb/d	all year	003
1,2-Dichloropropane	daily maximum	≤ .016 lb/d	all year	003
trans-1,2-Dichloroethylene	monthly average	≤ .001 lb/d	all year	003
trans-1,2-Dichloroethylene	daily maximum	≤ .004 lb/d	all year	003
1,2,4-Trichlorobenzene	monthly average	≤ .005 lb/d	all year	003
1,2,4-Trichlorobenzene	daily maximum	≤ .01 lb/d	all year	003
1,3-Dichlorobenzene	monthly average	≤ .0022 lb/d	all year	003
1,3-Dichlorobenzene	daily maximum	≤ .003 lb/d	all year	003
1,4-Dichlorobenzene	monthly average	≤ .0011 lb/d	all year	003
1,4-Dichlorobenzene	daily maximum	≤ .002 lb/d	all year	003
2-Chlorophenol	monthly average	≤ .002 lb/d	all year	003
2-Chlorophenol	daily maximum	≤ .007 lb/d	all year	003
2-Nitrophenol	monthly average	≤ .003 lb/d	all year	003
2-Nitrophenol	daily maximum	≤ .005 lb/d	all year	003
2,4-Dichlorophenol	monthly average	≤ .003 lb/d	all year	003
2,4-Dichlorophenol	daily maximum	≤ .008 lb/d	all year	003
2,4-Dimethylphenol	monthly average	≤ .001 lb/d	all year	003
2,4-Dimethylphenol	daily maximum	≤ .003 lb/d	all year	003
2,4-Dinitrotoluene	monthly average	≤ .008 lb/d	all year	003
2,4-Dinitrotoluene	daily maximum	≤ .02 lb/d	all year	003
2,4-Dinitrophenol	monthly average	≤ .005 lb/d	all year	003
2,4-Dinitrophenol	daily maximum	≤ .009 lb/d	all year	003
2,6-Dinitrotoluene	monthly average	≤ .018 lb/d	all year	003
2,6-Dinitrotoluene	daily maximum	≤ .046 lb/d	all year	003
4-Nitrophenol	monthly average	≤ .005 lb/d	all year	003
4-Nitrophenol	daily maximum	≤ .009 lb/d	all year	003
4,6-Dinitro-o-cresol	monthly average	≤ .006 lb/d	all year	003
4,6-Dinitro-o-cresol	daily maximum	≤ .02 lb/d	all year	003
Phenol	monthly average	≤ .0011 lb/d	all year	003
Phenol	daily maximum	≤ .002 lb/d	all year	003
Naphthalene	monthly average	≤ .002 lb/d	all year	003
Naphthalene	daily maximum	≤ .004 lb/d	all year	003
Di[2-ethylhexyl] phthalate [DEHP]	monthly average	≤ .007 lb/d	all year	003
Di[2-ethylhexyl] phthalate [DEHP]	daily maximum	≤ .02 lb/d	all year	003
Di-n-butyl phthalate	monthly average	≤ .002 lb/d	all year	003
Di-n-butyl phthalate	daily maximum	≤ .004 lb/d	all year	003
Vinyl chloride	monthly average	≤ .007 lb/d	all year	003
Vinyl chloride	daily maximum	≤ .019 lb/d	all year	003
Trichloroethylene	monthly average	≤ .001 lb/d	all year	003
Trichloroethylene	daily maximum	≤ .004 lb/d	all year	003
Hexachlorobenzene	monthly average	≤ .000001 lb/d	all year	003
Hexachlorobenzene	daily maximum	≤ .000003 lb/d	all year	003
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	003
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	003
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	003
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	003
Chlorine, total residual	daily maximum	report only (mg/L)	all year	003
1,3-Dichloropropylene	monthly average	≤ .002 lb/d	all year	003
1,3-Dichloropropylene	daily maximum	≤ .003 lb/d	all year	003
Coliform, fecal general	monthly geometric mean	≤ 200 #/100mL	all year	003
Coliform, fecal general	daily maximum	≤ 400 #/100mL	all year	003
Chloroethane	monthly average	≤ .007 lb/d	all year	003
Chloroethane	daily maximum	≤ .019 lb/d	all year	003
pH	instantaneous minimum	≥ 6 SU	all year	005
pH	instantaneous maximum	≤ 9 SU	all year	005
Oil & Grease	daily maximum	≤ 15 mg/L	all year	005
Carbon, tot organic [TOC]	daily maximum	≤ 50 mg/L	all year	005
Zinc, total [as Zn]	monthly average	report only (mg/L)	all year	005
Zinc, total [as Zn]	daily maximum	report only (mg/L)	all year	005
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	005
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	005
pH	instantaneous minimum	≥ 6 SU	all year	006
pH	instantaneous maximum	≤ 9 SU	all year	006
Oil & Grease	daily maximum	≤ 15 mg/L	all year	006
Carbon, tot organic [TOC]	daily maximum	≤ 50 mg/L	all year	006
Zinc, total [as Zn]	monthly average	report only (mg/L)	all year	006
Zinc, total [as Zn]	daily maximum	report only (mg/L)	all year	006
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	006
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	006
pH	instantaneous minimum	≥ 6 SU	all year	007
pH	instantaneous maximum	≤ 9 SU	all year	007
Oil & Grease	daily maximum	≤ 15 mg/L	all year	007
Nitrogen, ammonia total [as N]	monthly average	≤ 2 mg/L	all year	007
Nitrogen, ammonia total [as N]	daily maximum	≤ 4 mg/L	all year	007
Carbon, tot organic [TOC]	daily maximum	≤ 50 mg/L	all year	007
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	007
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	007

New limits from Jan 1, 2028

Parameter	New limit	New or tighter	Median, last 12 months	× new limit
Vinyl chloride, daily maximum	0.006 lb/d	tighter	—	—
Vinyl chloride, monthly average	0.002 lb/d	tighter	—	—

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/LA0048704 · MCP: https://passage-data.com/mcp