Clean Water Act discharge permit · NPDES LA0004367
CORNERSTONE CHEMICAL COMPANY, Westwego, LA: NPDES LA0004367 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 77Pollutants under a numeric limit
- 12Pollutants with an effluent exceedance
CORNERSTONE CHEMICAL COMPANY holds NPDES permit LA0004367, which discharges to Lake Cataouatche. EPA’s file records it issued June 19, 2015 and expiring July 31, 2020. 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 | CORNERSTONE CHEMICAL COMPANY |
|---|---|
| Permittee as filed | CORNERSTONE CHEMICAL COMPANY |
| NPDES ID | LA0004367 |
| 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 | June 19, 2015 |
| Expiration date | July 31, 2020 |
| Address | Westwego, LA 70094 |
| Receiving water | LAKE CATAOUATCHE |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Old River-Intracoastal Waterway (HUC 080801010305) |
| NAICS | 322223 – Plastics, Foil, and Coated Paper Bag Manufacturing [2007] |
| SIC | 2821 – Plastics Materials And Resins |
| Other EPA IDs (FRS) | RCRA handler LAD008175390; ICIS-AIR source LA0000002205100314 |
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
- 78Pollutants on file
- 77Under a numeric limit
- 16With a violation of any kind
- 12With 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 78 are shown.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Coliform, fecal general | 2 | 8 | 8 | July 31, 2025 | 99,999% over the limit |
| pH | 4 | 8 | 4 | June 30, 2025 | |
| Oil and grease | 3 | 5 | 4 | July 31, 2018 | 57% over the limit |
| BOD, 5-day, 20 deg. C | 2 | 3 | 3 | August 31, 2023 | 23% over the limit |
| Nitrogen, organic total [as N] | 2 | 3 | 3 | June 30, 2020 | 89% over the limit |
| Nitrogen, ammonia total [as N] | 3 | 4 | 2 | October 31, 2023 | 22% over the limit |
| Oxygen demand, chem. [high level] [COD] | 1 | 4 | 2 | June 30, 2025 | 77% over the limit |
| Acrylonitrile | 4 | 1 | 1 | December 31, 2015 | 27% over the limit |
| Solids, total suspended | 2 | 1 | 1 | March 31, 2020 | 111% over the limit |
| Cyanide, total [as CN] | 2 | 1 | 1 | May 31, 2017 | 411% over the limit |
| Copper, total [as Cu] | 2 | 1 | 1 | March 31, 2026 | 113% over the limit |
| pH range excursions, > 60 minutes | 1 | 1 | 1 | February 29, 2024 | 2,147,483,650% over the limit |
| Zinc, total [as Zn] | 2 | 38 | 0 | ||
| Flow, in conduit or thru treatment plant | 6 | 6 | 0 | ||
| Phosphorus, total [as P] | 1 | 2 | 0 | ||
| Oil & Grease | 0 | 1 | 0 | ||
| Whole effluent toxicity - retest #1 | 8 | 0 | 0 | ||
| Whole effluent toxicity - retest #2 | 8 | 0 | 0 | ||
| Whole Effluent Toxicity - Retest #3 | 8 | 0 | 0 | ||
| Carbon tetrachloride | 4 | 0 | 0 | ||
| 1,2-Dichloroethane | 4 | 0 | 0 | ||
| Chloroform | 4 | 0 | 0 | ||
| Toluene | 4 | 0 | 0 | ||
| Benzene | 4 | 0 | 0 | ||
| Acenaphthylene | 4 | 0 | 0 | ||
| Acenaphthene | 4 | 0 | 0 | ||
| Anthracene | 4 | 0 | 0 | ||
| Benzo[b]fluoranthene | 4 | 0 | 0 | ||
| Benzo[k]fluoranthene | 4 | 0 | 0 | ||
| Benzo[a]pyrene | 4 | 0 | 0 | ||
| Chlorobenzene | 4 | 0 | 0 | ||
| Chrysene | 4 | 0 | 0 | ||
| Diethyl phthalate | 4 | 0 | 0 | ||
| Dimethyl phthalate | 4 | 0 | 0 | ||
| Ethylbenzene | 4 | 0 | 0 | ||
| Fluoranthene | 4 | 0 | 0 | ||
| Fluorene | 4 | 0 | 0 | ||
| Hexachlorobutadiene | 4 | 0 | 0 | ||
| Hexachloroethane | 4 | 0 | 0 | ||
| Methyl chloride [Chloromethane] | 4 | 0 | 0 | ||
| Methylene chloride | 4 | 0 | 0 | ||
| Nitrobenzene | 4 | 0 | 0 | ||
| Phenanthrene | 4 | 0 | 0 | ||
| Pyrene | 4 | 0 | 0 | ||
| Tetrachloroethylene | 4 | 0 | 0 | ||
| 1,1-Dichloroethane | 4 | 0 | 0 | ||
| 1,1-Dichloroethylene | 4 | 0 | 0 | ||
| 1,1,1-Trichloroethane | 4 | 0 | 0 | ||
| 1,1,2-Trichloroethane | 4 | 0 | 0 | ||
| Benzo[a]anthracene | 4 | 0 | 0 | ||
| 1,2-Dichlorobenzene | 4 | 0 | 0 | ||
| 1,2-Dichloropropane | 4 | 0 | 0 | ||
| trans-1,2-Dichloroethylene | 4 | 0 | 0 | ||
| 1,2,4-Trichlorobenzene | 4 | 0 | 0 | ||
| 1,3-Dichlorobenzene | 4 | 0 | 0 | ||
| 1,4-Dichlorobenzene | 4 | 0 | 0 | ||
| 2-Nitrophenol | 4 | 0 | 0 | ||
| 2,4-Dimethylphenol | 4 | 0 | 0 | ||
| 2,4-Dinitrophenol | 4 | 0 | 0 | ||
| 4-Nitrophenol | 4 | 0 | 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 LA0004367.
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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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.