Karnack, TX
Longhorn Army Ammunition Plant is listed in the EPA Superfund Enterprise Management System with an NPL status of NPL Site and a Hazard Ranking System (HRS) score of 39.83. The site is located in Karnack, TX. Superfund National Priorities List inclusion is the EPA's formal designation that a contaminated site qualifies for long-term federal cleanup authority under the Comprehensive Environmental Response, Compensation, and Liability Act.
EPA Superfund records catalog 102 contaminants associated with this site, documented through the remedial investigation process. Construction of the cleanup remedy has not yet been designated as complete in the EPA record.
NPL listing does not, by itself, establish a health risk to nearby residents, it triggers federal authority to investigate, score, and remediate. HRS scores of 28.50 or above qualify a site for the NPL; the ranking weighs contaminant toxicity, release pathways, waste quantity, and affected population. For current site conditions and community health guidance, contact the Texas environmental or health agency and the EPA Regional Superfund office listed on the official site profile.
What is the cleanup status of this Superfund site?
Contaminants
| Contaminant | Media |
|---|---|
| 1,1,1-TRICHLOROETHANE | Groundwater |
| 1,1,2-TRICHLOROETHANE | Groundwater |
| 1,1,2-TRICHLOROETHANE | Surface Water |
| 1,1-DICHLOROETHANE | Groundwater |
| 1,1-DICHLOROETHENE | Groundwater |
| 1,1-DICHLOROETHENE | Surface Water |
| 1,2-DICHLOROETHANE | Groundwater |
| 1,2-DICHLOROETHANE | Surface Water |
| 1,3,5-TRINITROBENZENE | Groundwater |
| 1,3-DINITROBENZENE | Buildings/Structures |
| 1,4-DIOXANE | Groundwater |
| 1-METHYL-2-NITROBENZENE | Groundwater |
| 1-METHYL-3-NITROBENZENE | Groundwater |
| 1-METHYL-4-NITROBENZENE | Groundwater |
| 2,3,7,8-TETRACHLORODIBENZO-p-DIOXIN (TCDD) TOXICITY EQUIVALENTS (TEq) | Groundwater |
| 2,3,7,8-TETRACHLORODIBENZO-p-DIOXIN (TCDD) TOXICITY EQUIVALENTS (TEq) | Soil |
| 2,4,6-TRINITROPHENOL | Groundwater |
| 2,4,6-TRINITROTOLUENE | Buildings/Structures |
| 2,4,6-TRINITROTOLUENE | Groundwater |
| 2,4,6-TRINITROTOLUENE | Soil |
| 2,4-DINITROTOLUENE | Buildings/Structures |
| 2,4-DINITROTOLUENE | Groundwater |
| 2,4-DINITROTOLUENE | Soil |
| 2,6-DINITROTOLUENE | Buildings/Structures |
| 2,6-DINITROTOLUENE | Groundwater |
| 2,6-DINITROTOLUENE | Soil |
| 2-AMINO-4,6-DINITROTOLUENE | Buildings/Structures |
| 4-AMINO-2,6-DINITROTOLUENE | Buildings/Structures |
| ACETONE | Groundwater |
| ACETONE | Solid Waste |
| ALUMINUM | Groundwater |
| ANTIMONY | Groundwater |
| ARSENIC | Groundwater |
| ARSENIC | Soil |
| ARSENIC | Surface Water |
| BARIUM | Groundwater |
| BARIUM | Soil |
| BENZENE | Groundwater |
| BIS(2-ETHYLHEXYL)PHTHALATE | Groundwater |
| BIS(2-ETHYLHEXYL)PHTHALATE | Soil |
| BIS(2-ETHYLHEXYL)PHTHALATE | Solid Waste |
| BROMODICHLOROMETHANE | Groundwater |
| CADMIUM | Groundwater |
| CARBON TETRACHLORIDE | Groundwater |
| CHLORIDE | Groundwater |
| CHLOROBENZENE | Groundwater |
| CHLOROETHANE | Groundwater |
| CHLOROETHENE (VINYL CHLORIDE) | Groundwater |
| CHLOROETHENE (VINYL CHLORIDE) | Surface Water |
| CHLOROFORM | Groundwater |
| CHROMIUM | Groundwater |
| CHROMIUM | Soil |
| CHROMIUM | Surface Water |
| CIS-1,2-DICHLOROETHENE | Groundwater |
| CIS-1,2-DICHLOROETHENE | Solid Waste |
| CIS-1,2-DICHLOROETHENE | Surface Water |
| COBALT | Groundwater |
| DICHLOROMETHANE (METHYLENE CHLORIDE) | Groundwater |
| DICHLOROMETHANE (METHYLENE CHLORIDE) | Soil |
| DICHLOROMETHANE (METHYLENE CHLORIDE) | Solid Waste |
| DICHLOROMETHANE (METHYLENE CHLORIDE) | Surface Water |
| ETHYLBENZENE | Groundwater |
| EXPLOSIVES | Solid Waste |
| HEXACHLOROBENZENE | Groundwater |
| IRON | Groundwater |
| LEAD | Groundwater |
| LEAD | Soil |
| MANGANESE | Groundwater |
| MANGANESE | Surface Water |
| MERCURY | Groundwater |
| NICKEL | Groundwater |
| NICKEL | Soil |
| NICKEL | Surface Water |
| NITROBENZENE | Groundwater |
| PENTACHLOROPHENOL | Groundwater |
| PERCHLORATE | Groundwater |
| PERCHLORATE | Soil |
| PERCHLORATE | Surface Water |
| PETROLEUM | Groundwater |
| SELENIUM | Groundwater |
| SILVER | Groundwater |
| STRONTIUM | Groundwater |
| STYRENE | Groundwater |
| SULFATE | Groundwater |
| TETRACHLOROETHENE | Groundwater |
| TETRACHLOROETHENE | Soil |
| TETRACHLOROETHENE | Solid Waste |
| THALLIUM | Groundwater |
| THALLIUM | Soil |
| THALLIUM | Surface Water |
| TIN | Groundwater |
| TOLUENE | Groundwater |
| TRANS-1,2-DICHLOROETHENE | Groundwater |
| TRICHLOROETHENE | Free-phase NAPL |
| TRICHLOROETHENE | Groundwater |
| TRICHLOROETHENE | Soil |
| TRICHLOROETHENE | Solid Waste |
| TRICHLOROETHENE | Surface Water |
| UNEXPLODED ORDNANCE (UXO) | Solid Waste |
| VANADIUM | Groundwater |
| XYLENE (MIXED ISOMERS) | Groundwater |
| ZINC | Groundwater |
Location
Other Superfund Sites in Texas
| Site Name | Status | HRS Score |
|---|---|---|
| Air Force Plant #4 (General Dynamics) | NPL Site | 39.92 |
| ALCOA (Point Comfort)/Lavaca Bay | NPL Site | 50.00 |
| Bailey Waste Disposal | Deleted NPL Site | 53.42 |
| Bandera Road Ground Water Plume | NPL Site | 50.00 |
| Bio-Ecology Systems, Inc. | Deleted NPL Site | 35.06 |
| Brine Service Company | NPL Site | 50.00 |
| Brio Refining, Inc. | Deleted NPL Site | 50.38 |
| Circle Court Ground Water Plume | NPL Site | 50.00 |
| City of Perryton Well No. 2 | NPL Site | 50.00 |
| Conroe Creosoting Company | NPL Site | 48.00 |
Frequently Asked Questions
What is the Longhorn Army Ammunition Plant Superfund site? ▼
Is Longhorn Army Ammunition Plant dangerous to live near? ▼
What is the HRS score for Longhorn Army Ammunition Plant? ▼
What contaminants are at the Longhorn Army Ammunition Plant site? ▼
What is the cleanup status of Longhorn Army Ammunition Plant? ▼
About Superfund
The National Priorities List (NPL) is the list of sites of national priority among the known releases or threatened releases of hazardous substances, pollutants, or contaminants throughout the United States. The NPL is intended primarily to guide the EPA in determining which sites warrant further investigation.
The Hazard Ranking System (HRS) score is the principal mechanism the EPA uses to evaluate sites for placement on the NPL. Sites with an HRS score of 28.50 or greater are eligible for the NPL. Higher scores indicate greater potential risk.
The EPA's Superfund cleanup process typically follows these phases: preliminary assessment, site inspection, NPL listing, remedial investigation/feasibility study, remedy selection, remedial design/action, construction completion, post-construction completion, and NPL deletion. Some sites remain on the NPL for decades.
PlainEnviro presents this data without advocacy framing. The presence of a site on the NPL does not by itself indicate an immediate health risk to nearby residents. For site-specific health questions, consult your local environmental or health agency.
Read our methodology - how this data is sourced, computed, and verified.