Clean Water Act discharge permit · NPDES LA0113531

W.R. GRACE & CO.-CONN., Baton Rouge, LA: NPDES LA0113531 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MajorDischarger class
69Pollutants under a numeric limit
5Pollutants with an effluent exceedance

W.R. GRACE & CO.-CONN., held by W.R. Grace & Co.-Conn., holds NPDES permit LA0113531, which discharges to Monte Sano Bayou. EPA’s file records it issued July 19, 2018 and expiring July 31, 2023. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filed	W.R. GRACE & CO.-CONN.
Permittee as filed	W.R. Grace & Co.-Conn.
NPDES ID	LA0113531
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	July 19, 2018
Expiration date	July 31, 2023
Address	Baton Rouge, LA 70805
Receiving water	MONTE SANO BAYOU
Receiving water impaired	303(D) Listed
Subwatershed	Devils Swamp-Bayou Baton Rouge (HUC 080702010402)
SIC	2899 – Chemical Preparations
Other EPA IDs (FRS)	RCRA handler LAD000757286; ICIS-AIR source LA0000002203300150

Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download; cross-program IDs from EPA’s FRS facility-registry crosswalk.

Effluent limits and exceedances

72Pollutants on file
69Under a numeric limit
61With a violation of any kind
5With 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 72 are shown.

Pollutant or measure	Limits	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
Coliform, fecal general	2	7	7	June 30, 2016	1,125% over the limit
Toluene	2	6	2	November 30, 2006	1,923% over the limit
BOD, 5-day, 20 deg. C	2	3	1	April 30, 2008	105% over the limit
Chloroethane	2	3	1	May 31, 2011	30% over the limit
pH range excursions, > 60 minutes	1	3	1	May 31, 2022	2,147,483,650% over the limit
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex	2	18	0
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas	2	18	0
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex	2	18	0
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas	2	18	0
Coef Of Var Static Renewal 48Hr Acute D. pulex	1	14	0
Coef Of Var Static Renewal 48Hr Acute Pimephales promelas	1	14	0
Chlorine, total residual	0	10	0
Carbon, tot organic [TOC]	2	4	0
Acenaphthylene	2	4	0
Acenaphthene	2	4	0
Anthracene	2	4	0
Benzo[b]fluoranthene	2	4	0
Benzo[k]fluoranthene	2	4	0
Benzo[a]pyrene	2	4	0
Chrysene	2	4	0
Diethyl phthalate	2	4	0
Dimethyl phthalate	2	4	0
Fluoranthene	2	4	0
Fluorene	2	4	0
Hexachloroethane	2	4	0
Methylene chloride	2	4	0
Nitrobenzene	2	4	0
Phenanthrene	2	4	0
Pyrene	2	4	0
Tetrachloroethylene	2	4	0
1,1,1-Trichloroethane	2	4	0
1,1,2-Trichloroethane	2	4	0
Benzo[a]anthracene	2	4	0
1,2-Dichlorobenzene	2	4	0
1,2,4-Trichlorobenzene	2	4	0
1,3-Dichlorobenzene	2	4	0
1,4-Dichlorobenzene	2	4	0
Naphthalene	2	4	0
Di[2-ethylhexyl] phthalate [DEHP]	2	4	0
Di-n-butyl phthalate	2	4	0
Vinyl chloride	2	4	0
Trichloroethylene	2	4	0
Flow, in conduit or thru treatment plant	4	2	0
pH	2	2	0
Solids, total suspended	2	2	0
Carbon tetrachloride	2	2	0
1,2-Dichloroethane	2	2	0
Chloroform	2	2	0
Benzene	2	2	0
Acrylonitrile	2	2	0
Chlorobenzene	2	2	0
Ethylbenzene	2	2	0
Methyl chloride [Chloromethane]	2	2	0
1,1-Dichloroethane	2	2	0
1,1-Dichloroethylene	2	2	0
1,2-Dichloropropane	2	2	0
trans-1,2-Dichloroethylene	2	2	0
1,3-Dichloropropylene	2	2	0
Nitrogen, total [as N]	0	2	0
Phosphorus, total [as P]	0	2	0

Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES LA0113531.

Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.

Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.

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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID LA0113531 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

This public-records page covers Clean Water Act NPDES permit LA0113531, held by W.R. GRACE & CO.-CONN. in Baton Rouge, LA, which discharges to Monte Sano Bayou within the Devils Swamp-Bayou Baton Rouge subwatershed (HUC 080702010402). The page lists a Major Discharger class, 69 pollutants under a numeric limit, and 5 pollutants with an effluent exceedance, with the permit shown as administratively continued after its July 31, 2023 expiration.