Clean Water Act discharge permit · NPDES LA0005223

SYENSQO USA LLC - BATON ROUGE FACILITY, Baton Rouge, LA: NPDES LA0005223 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MajorDischarger class
81Pollutants under a numeric limit
34Pollutants with an effluent exceedance
1Inspections on file
0Formal enforcement actions

SYENSQO USA LLC - BATON ROUGE FACILITY, held by Solvay USA Inc., holds NPDES permit LA0005223, which discharges to Seg 070301 Mississipp. EPA’s file records it issued August 25, 2017 and expiring August 24, 2022.

SYENSQO USA LLC - BATON ROUGE FACILITY, Baton Rouge, Louisiana: Individual permit LA0005223, held by Solvay USA Inc.; Administratively continued (past its expiration date and still in force until reissued); issued August 25, 2017, term to August 24, 2022; discharges to SEG 070301 MISSISSIPP.

Solids, total suspended: 5 limits, 26 violations of any kind, 18 effluent exceedances, latest April 30, 2025, largest 355% over the limit.
BOD, 5-day, 20 deg. C: 2 limits, 8 violations of any kind, 7 effluent exceedances, latest March 31, 2026, largest 99,999% over the limit.
Coliform, fecal general: 0 limits, 5 violations of any kind, 5 effluent exceedances, latest June 30, 2015, largest 99,999% over the limit.
pH: 8 limits, 28 violations of any kind, 4 effluent exceedances, latest April 30, 2017.
Zinc, total [as Zn]: 1 limit, 13 violations of any kind, 4 effluent exceedances, latest July 31, 2021, largest 58% over the limit.
Nitrogen, ammonia total [as N]: 2 limits, 7 violations of any kind, 3 effluent exceedances, latest December 31, 2022, largest 31% over the limit.
pH range excursions, > 60 minutes: 2 limits, 8 violations of any kind, 2 effluent exceedances, latest February 28, 2021, largest 2,147,483,650% over the limit.
Benzene: 3 limits, 4 violations of any kind, 2 effluent exceedances, latest December 31, 2011, largest 462% over the limit.
Carbon tetrachloride: 2 limits, 2 violations of any kind, 2 effluent exceedances, latest December 31, 2011, largest 1,075% over the limit.
Chloroform: 2 limits, 2 violations of any kind, 2 effluent exceedances, latest December 31, 2011, largest 895% over the limit.
Toluene: 2 limits, 2 violations of any kind, 2 effluent exceedances, latest December 31, 2011, largest 708% over the limit.
Acrylonitrile: 2 limits, 2 violations of any kind, 2 effluent exceedances, latest December 31, 2011, largest 2,418% over the limit.
Chlorobenzene: 2 limits, 2 violations of any kind, 2 effluent exceedances, latest December 31, 2011, largest 1,337% over the limit.
Ethylbenzene: 2 limits, 2 violations of any kind, 2 effluent exceedances, latest December 31, 2011, largest 546% over the limit.
Methyl chloride [Chloromethane]: 2 limits, 2 violations of any kind, 2 effluent exceedances, latest December 31, 2011, largest 139% over the limit.
Methylene chloride: 2 limits, 2 violations of any kind, 2 effluent exceedances, latest December 31, 2011, largest 934% over the limit.
Tetrachloroethylene: 2 limits, 2 violations of any kind, 2 effluent exceedances, latest December 31, 2011, largest 824% over the limit.
1,1-Dichloroethane: 2 limits, 2 violations of any kind, 2 effluent exceedances, latest December 31, 2011, largest 824% over the limit.
1,1-Dichloroethylene: 2 limits, 2 violations of any kind, 2 effluent exceedances, latest December 31, 2011, largest 1,193% over the limit.
1,1,1-Trichloroethane: 2 limits, 2 violations of any kind, 2 effluent exceedances, latest December 31, 2011, largest 895% over the limit.
1,1,2-Trichloroethane: 2 limits, 2 violations of any kind, 2 effluent exceedances, latest December 31, 2011, largest 895% over the limit.
1,2-Dichlorobenzene: 2 limits, 2 violations of any kind, 2 effluent exceedances, latest December 31, 2011, largest 439% over the limit.
trans-1,2-Dichloroethylene: 2 limits, 2 violations of any kind, 2 effluent exceedances, latest December 31, 2011, largest 895% over the limit.
1,3-Dichlorobenzene: 2 limits, 2 violations of any kind, 2 effluent exceedances, latest December 31, 2011, largest 1,261% over the limit.
1,4-Dichlorobenzene: 2 limits, 2 violations of any kind, 2 effluent exceedances, latest December 31, 2011, largest 2,772% over the limit.
Trichloroethylene: 2 limits, 2 violations of any kind, 2 effluent exceedances, latest December 31, 2011, largest 895% over the limit.
1,3-Dichloropropylene: 2 limits, 2 violations of any kind, 2 effluent exceedances, latest December 31, 2011, largest 618% over the limit.
Chloroethane: 2 limits, 2 violations of any kind, 2 effluent exceedances, latest December 31, 2011, largest 298% over the limit.
Carbon, tot organic [TOC]: 5 limits, 13 violations of any kind, 1 effluent exceedance, latest October 31, 2012, largest 17% over the limit.
pH range excursions, monthly total accum: 2 limits, 7 violations of any kind, 1 effluent exceedance, latest February 28, 2021, largest 109% over the limit.
Sulfite [as SO3]: 0 limits, 3 violations of any kind, 1 effluent exceedance, latest January 31, 2013, largest 29% over the limit.
1,2-Dichloroethane: 2 limits, 1 violation of any kind, 1 effluent exceedance, latest December 31, 2011, largest 208% over the limit.
1,2-Dichloropropane: 2 limits, 1 violation of any kind, 1 effluent exceedance, latest December 31, 2011, largest 36% over the limit.
Vinyl chloride: 2 limits, 1 violation of any kind, 1 effluent exceedance, latest December 31, 2011, largest 99% over the limit.
Flow, in conduit or thru treatment plant: 8 limits, 18 violations of any kind, 0 effluent exceedances.
Oil and grease: 0 limits, 11 violations of any kind, 0 effluent exceedances.
Nitrogen, total [as N]: 2 limits, 6 violations of any kind, 0 effluent exceedances.
Phosphorus, total [as P]: 2 limits, 6 violations of any kind, 0 effluent exceedances.
Cobalt, total [as Co]: 2 limits, 6 violations of any kind, 0 effluent exceedances.
Mercury, total [as Hg]: 0 limits, 6 violations of any kind, 0 effluent exceedances.
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex: 2 limits, 4 violations of any kind, 0 effluent exceedances.
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas: 2 limits, 4 violations of any kind, 0 effluent exceedances.
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex: 2 limits, 4 violations of any kind, 0 effluent exceedances.
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas: 2 limits, 4 violations of any kind, 0 effluent exceedances.
Lead, total [as Pb]: 1 limit, 4 violations of any kind, 0 effluent exceedances.
Titanium, total [as Ti]: 0 limits, 4 violations of any kind, 0 effluent exceedances.
Oil & Grease: 3 limits, 3 violations of any kind, 0 effluent exceedances.
Coef Of Var Static Renewal 48Hr Acute D. pulex: 1 limit, 3 violations of any kind, 0 effluent exceedances.
Coef Of Var Static Renewal 48Hr Acute Pimephales promelas: 1 limit, 3 violations of any kind, 0 effluent exceedances.
BTEX: 1 limit, 2 violations of any kind, 0 effluent exceedances.
Arsenic, total [as As]: 0 limits, 2 violations of any kind, 0 effluent exceedances.
Cadmium, total [as Cd]: 0 limits, 2 violations of any kind, 0 effluent exceedances.
Chromium, total [as Cr]: 0 limits, 2 violations of any kind, 0 effluent exceedances.
Copper, total [as Cu]: 0 limits, 2 violations of any kind, 0 effluent exceedances.
Silver, total [as Ag]: 0 limits, 2 violations of any kind, 0 effluent exceedances.
Whole effluent toxicity - retest #1: 4 limits, 0 violations of any kind, 0 effluent exceedances.
Whole effluent toxicity - retest #2: 4 limits, 0 violations of any kind, 0 effluent exceedances.
Whole Effluent Toxicity - Retest #3: 4 limits, 0 violations of any kind, 0 effluent exceedances.
Nickel, total [as Ni]: 2 limits, 0 violations of any kind, 0 effluent exceedances.
Acenaphthylene: 2 limits, 0 violations of any kind, 0 effluent exceedances.

March 19, 2026: Evaluation (S).

SYENSQO USA LLC - BATON ROUGE FACILITY among its neighbors

EPA’s permit file holds 33 discharge permits in the Devils Swamp-Bayou Baton Rouge subwatershed (HUC 080702010402), LA0005223 among them. Its county holds 457, 22 of them major permits; LA0005223 is a major permit.

Other permits in the Devils Swamp-Bayou Baton Rouge subwatershed (HUC 080702010402)

AIR PRODUCTS & CHEMICALS INC - BATON ROUGE H2 PLANT, Baton Rouge: LA0124397, minor permit, permit term to March 31, 2026
AMERICAN CONSTRUCTION & DEMOLISHING CO - FORMER BANKS ELEMENTARY SCHOOL DEMO, Baton Rouge: LAR10Q697, minor permit, permit term to February 1, 2027
ANGELLE CONCRETE GROUP LLC - PORTABLE PLANT #3, Baton Rouge: LAG119075, minor permit, permit term to June 4, 2029
BANKSTON'S DITCH AREA, Baton Rouge: LA0118893, minor permit, permit term to October 31, 2024
BATON ROUGE, CITY OF, Scotlandville: LA0036439, major permit, discharging to MISSISSIPPI RIVER, permit term to August 31, 2023
BRANDON CRAFT DEVELOPERS LLC, Baton Rouge: LAR10J959, minor permit, permit term to September 30, 2017
BURNS CONSTRUCTION GROUP, LLC - LONG FARM, Baton Rouge: LAR10Q716, minor permit, permit term to November 20, 2026
CEMUS LLC, Baton Rouge: LA0002909, minor permit, discharging to MISS. RIVER & MONTE SANO BAYOU, permit term to October 31, 2020
CHEVAL POINT DEVELOPMENT LLC, Baton Rouge: LAR10N551, minor permit, permit term to September 30, 2019
COMMAND CONSTRUCTION INDUSTRIES, LLC - PLANK RD CORRIDOR ENHANCEMENT SEGMENT 2, Baton Rouge: LAR10Q447, minor permit, permit term to June 19, 2026

Identity

Facility as filed	SYENSQO USA LLC - BATON ROUGE FACILITY
Permittee as filed	Solvay USA Inc.
NPDES ID	LA0005223
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Individual permit
Discharger class	Major discharger
Facility type	Not a publicly owned treatment works
Issued	August 25, 2017
Expiration date	August 24, 2022
Address	Baton Rouge, LA 70805
Receiving water	SEG 070301 MISSISSIPP
Receiving water impaired	303(D) Listed
Subwatershed	Devils Swamp-Bayou Baton Rouge (HUC 080702010402)
Other EPA IDs (FRS)	ICIS-AIR source LA0000002203300033

Effluent limits and exceedances

91Pollutants on file
81Under a numeric limit
55With a violation of any kind
34With an effluent exceedance

An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant; the 60 with the most exceedances of 91 are shown.

Pollutant or measure	Limits	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
Solids, total suspended	5	26	18	April 30, 2025	355% over the limit
BOD, 5-day, 20 deg. C	2	8	7	March 31, 2026	99,999% over the limit
Coliform, fecal general	0	5	5	June 30, 2015	99,999% over the limit
pH	8	28	4	April 30, 2017
Zinc, total [as Zn]	1	13	4	July 31, 2021	58% over the limit
Nitrogen, ammonia total [as N]	2	7	3	December 31, 2022	31% over the limit
pH range excursions, > 60 minutes	2	8	2	February 28, 2021	2,147,483,650% over the limit
Benzene	3	4	2	December 31, 2011	462% over the limit
Carbon tetrachloride	2	2	2	December 31, 2011	1,075% over the limit
Chloroform	2	2	2	December 31, 2011	895% over the limit
Toluene	2	2	2	December 31, 2011	708% over the limit
Acrylonitrile	2	2	2	December 31, 2011	2,418% over the limit
Chlorobenzene	2	2	2	December 31, 2011	1,337% over the limit
Ethylbenzene	2	2	2	December 31, 2011	546% over the limit
Methyl chloride [Chloromethane]	2	2	2	December 31, 2011	139% over the limit
Methylene chloride	2	2	2	December 31, 2011	934% over the limit
Tetrachloroethylene	2	2	2	December 31, 2011	824% over the limit
1,1-Dichloroethane	2	2	2	December 31, 2011	824% over the limit
1,1-Dichloroethylene	2	2	2	December 31, 2011	1,193% over the limit
1,1,1-Trichloroethane	2	2	2	December 31, 2011	895% over the limit
1,1,2-Trichloroethane	2	2	2	December 31, 2011	895% over the limit
1,2-Dichlorobenzene	2	2	2	December 31, 2011	439% over the limit
trans-1,2-Dichloroethylene	2	2	2	December 31, 2011	895% over the limit
1,3-Dichlorobenzene	2	2	2	December 31, 2011	1,261% over the limit
1,4-Dichlorobenzene	2	2	2	December 31, 2011	2,772% over the limit
Trichloroethylene	2	2	2	December 31, 2011	895% over the limit
1,3-Dichloropropylene	2	2	2	December 31, 2011	618% over the limit
Chloroethane	2	2	2	December 31, 2011	298% over the limit
Carbon, tot organic [TOC]	5	13	1	October 31, 2012	17% over the limit
pH range excursions, monthly total accum	2	7	1	February 28, 2021	109% over the limit
Sulfite [as SO3]	0	3	1	January 31, 2013	29% over the limit
1,2-Dichloroethane	2	1	1	December 31, 2011	208% over the limit
1,2-Dichloropropane	2	1	1	December 31, 2011	36% over the limit
Vinyl chloride	2	1	1	December 31, 2011	99% over the limit
Flow, in conduit or thru treatment plant	8	18	0
Oil and grease	0	11	0
Nitrogen, total [as N]	2	6	0
Phosphorus, total [as P]	2	6	0
Cobalt, total [as Co]	2	6	0
Mercury, total [as Hg]	0	6	0
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex	2	4	0
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas	2	4	0
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex	2	4	0
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas	2	4	0
Lead, total [as Pb]	1	4	0
Titanium, total [as Ti]	0	4	0
Oil & Grease	3	3	0
Coef Of Var Static Renewal 48Hr Acute D. pulex	1	3	0
Coef Of Var Static Renewal 48Hr Acute Pimephales promelas	1	3	0
BTEX	1	2	0
Arsenic, total [as As]	0	2	0
Cadmium, total [as Cd]	0	2	0
Chromium, total [as Cr]	0	2	0
Copper, total [as Cu]	0	2	0
Silver, total [as Ag]	0	2	0
Whole effluent toxicity - retest #1	4	0	0
Whole effluent toxicity - retest #2	4	0	0
Whole Effluent Toxicity - Retest #3	4	0	0
Nickel, total [as Ni]	2	0	0
Acenaphthylene	2	0	0

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES LA0005223.

Inspections

Date	What EPA recorded	Agency
March 19, 2026	Evaluation	S

Formal enforcement and penalties

0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.

Informal enforcement

EPA’s informal enforcement file holds no action for NPDES LA0005223.

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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

This public-records page covers Clean Water Act NPDES permit LA0005223 for the SYENSQO USA LLC - BATON ROUGE FACILITY in Baton Rouge, LA, held by Solvay USA Inc., with the permit status listed as administratively continued. The page lists 81 as the facility's discharger class, 34 pollutants under a numeric limit, and 34 pollutants with an effluent exceedance.