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Clean Water Act discharge permit · NPDES TX0002933

DOW CHEMICAL LA PORTE SITE, La Porte, TX: NPDES TX0002933 discharge permit, effluent exceedances, inspections, penalties

DOW CHEMICAL LA PORTE SITE, held by DOW CHEMICAL COMPANY (THE), holds NPDES permit TX0002933, which discharges to Unnamed Ditch, San Jacinto Bay. EPA’s file records it issued March 24, 2014 and expiring October 1, 2018. 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 filedDOW CHEMICAL LA PORTE SITE
Permittee as filedDOW CHEMICAL COMPANY (THE)
NPDES IDTX0002933
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMajor discharger
Facility typeNot a publicly owned treatment works
IssuedMarch 24, 2014
Expiration dateOctober 1, 2018
AddressLa Porte, TX 77571
Receiving waterUNNAMED DITCH, SAN JACINTO BAY
SubwatershedGoose Creek-Frontal Galveston Bay (HUC 120401040706)
SIC2869 – Industrial Organic Chemicals
Other EPA IDs (FRS)RCRA handler TXD000017756; ICIS-AIR source TX0000004820100053

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

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 83 are shown.

Pollutant or measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
Enterococci41713November 30, 202499,999% over the limit
Chlorobenzene255May 31, 20211,478% over the limit
Solids, total suspended262November 30, 202416% over the limit
pH681July 31, 2020
Oil & Grease481February 28, 2019280% over the limit
Phenolic compounds, total271March 31, 201735% over the limit
Chloroform211August 31, 201712% over the limit
Flow, in conduit or thru treatment plant260
Carbon, tot organic [TOC]450
BOD, 5-day, 20 deg. C240
Nitrogen, organic total [as N]240
Nitrogen, ammonia total [as N]240
Phosphorus, total [as P]240
Acenaphthylene220
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Menidia menidia220
Hexachloroethane210
LC50 Pass/Fail Static 24Hr Acute Americamysis bahia (formerly Mysidopsis bahia)110
LC50 Pass/Fail Static 24Hr Acute Menidia menidia110
Acrylonitrile400
Benzo[a]pyrene400
Phenanthrene400
Benzo[a]anthracene400
Hexachlorobenzene400
Whole effluent toxicity - retest #1300
Whole effluent toxicity - retest #2300
Carbon tetrachloride200
1,2-Dichloroethane200
Toluene200
Benzene200
Acenaphthene200
Anthracene200
Benzo[b]fluoranthene200
Benzo[k]fluoranthene200
Chrysene200
Diethyl phthalate200
Dimethyl phthalate200
Ethylbenzene200
Fluoranthene200
Fluorene200
Hexachlorobutadiene200
Methyl chloride [Chloromethane]200
Methylene chloride200
Nitrobenzene200
Pyrene200
Tetrachloroethylene200
1,1-Dichloroethane200
1,1-Dichloroethylene200
1,1,1-Trichloroethane200
1,1,2-Trichloroethane200
1,2-Dichlorobenzene200
1,2-Dichloropropane200
trans-1,2-Dichloroethylene200
1,2,4-Trichlorobenzene200
1,3-Dichlorobenzene200
1,4-Dichlorobenzene200
2-Chlorophenol200
2-Nitrophenol200
2,4-Dichlorophenol200
2,4-Dimethylphenol200
2,4-Dinitrotoluene200

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

EPA’s single-event violation file, as loaded, holds no violation for NPDES TX0002933.

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 TX0002933 there.

Nearby on the register

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

What this page shows

This public-records page covers NPDES permit TX0002933 for the DOW CHEMICAL LA PORTE SITE in La Porte, TX, held by DOW CHEMICAL COMPANY (THE), which discharges to UNNAMED DITCH, SAN JACINTO BAY within subwatershed Goose Creek-Frontal Galveston Bay (HUC 120401040706). The permit is listed as a Major discharger and is administratively continued, with 83 pollutants under a numeric limit and 7 pollutants with an effluent exceedance.