Clean Water Act discharge permit · NPDES TX0089125
MONT BELVIEU PLASTICS PLANT, Mont Belvieu, TX: NPDES TX0089125 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 75Pollutants under a numeric limit
- 10Pollutants with an effluent exceedance
MONT BELVIEU PLASTICS PLANT, held by EXXON MOBIL CORPORATION, holds NPDES permit TX0089125, which discharges to Cedar Bayou Above Tidal. EPA’s file records it issued July 2, 2019 and expiring July 2, 2024. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | MONT BELVIEU PLASTICS PLANT |
|---|---|
| Permittee as filed | EXXON MOBIL CORPORATION |
| NPDES ID | TX0089125 |
| 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 2, 2019 |
| Expiration date | July 2, 2024 |
| Address | Mont Belvieu, TX 77521 |
| Receiving water | CEDAR BAYOU ABOVE TIDAL |
| Subwatershed | Ellis Branch-Cedar Bayou (HUC 120402030105) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 90Pollutants on file
- 75Under a numeric limit
- 79With a violation of any kind
- 10With 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 90 are shown.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Flow, in conduit or thru treatment plant | 2 | 24 | 8 | September 30, 2017 | 46% over the limit |
| Whole effluent toxicity | 0 | 14 | 6 | March 31, 2018 | 99,999% over the limit |
| Solids, total suspended | 2 | 19 | 3 | April 30, 2021 | 204% over the limit |
| pH | 2 | 18 | 2 | January 31, 2014 | |
| Oxygen, dissolved [DO] | 1 | 10 | 2 | July 31, 2009 | 38% over the limit |
| Oil & Grease | 2 | 17 | 1 | May 31, 2002 | 8% over the limit |
| Nitrogen, ammonia total [as N] | 2 | 17 | 1 | January 31, 2002 | 1% over the limit |
| Solids, total dissolved | 2 | 17 | 1 | February 28, 2003 | 4% over the limit |
| BOD, 5-day, 20 deg. C | 0 | 13 | 1 | July 31, 2000 | 46% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 2 | 5 | 1 | February 28, 2013 | 174% over the limit |
| Oxygen demand, chem. [high level] [COD] | 2 | 18 | 0 | ||
| Sulfate, total [as SO4] | 2 | 17 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 0 | 13 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia | 0 | 12 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas | 0 | 12 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia | 0 | 12 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas | 0 | 12 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 0 | 11 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 0 | 11 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 0 | 11 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 0 | 11 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 0 | 11 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 0 | 10 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas | 0 | 10 | 0 | ||
| 1,2-Dichloroethane | 2 | 4 | 0 | ||
| 1,1-Dichloroethylene | 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-Dichloropropane | 2 | 4 | 0 | ||
| 1,2,4-Trichlorobenzene | 2 | 4 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute D. Pulex | 1 | 3 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute Pimephales promelas | 1 | 3 | 0 | ||
| Carbon tetrachloride | 2 | 2 | 0 | ||
| Chloroform | 2 | 2 | 0 | ||
| Toluene | 2 | 2 | 0 | ||
| Benzene | 2 | 2 | 0 | ||
| Acenaphthylene | 2 | 2 | 0 | ||
| Acenaphthene | 2 | 2 | 0 | ||
| Acrylonitrile | 2 | 2 | 0 | ||
| Anthracene | 2 | 2 | 0 | ||
| Benzo[b]fluoranthene | 2 | 2 | 0 | ||
| Benzo[k]fluoranthene | 2 | 2 | 0 | ||
| Benzo[a]pyrene | 2 | 2 | 0 | ||
| Chlorobenzene | 2 | 2 | 0 | ||
| Chrysene | 2 | 2 | 0 | ||
| Diethyl phthalate | 2 | 2 | 0 | ||
| Dimethyl phthalate | 2 | 2 | 0 | ||
| Ethylbenzene | 2 | 2 | 0 | ||
| Fluoranthene | 2 | 2 | 0 | ||
| Fluorene | 2 | 2 | 0 | ||
| Hexachlorobutadiene | 2 | 2 | 0 | ||
| Hexachloroethane | 2 | 2 | 0 | ||
| Methyl chloride [Chloromethane] | 2 | 2 | 0 | ||
| Methylene chloride | 2 | 2 | 0 | ||
| Nitrobenzene | 2 | 2 | 0 | ||
| Phenanthrene | 2 | 2 | 0 | ||
| Pyrene | 2 | 2 | 0 | ||
| Tetrachloroethylene | 2 | 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
- 1Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| January 22, 2019 | Permit Violations - Violation Specified in Comment | ST6 |
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 September 15, 2026.