Longhorn Army Ammunition Plant Karnack TX

The 8,416-acre Longhorn Army Ammunition Plant (LHAAP) installation is located between State Highway 43 and Caddo Lake in Karnack, Harrison County, Texas, approximately 14 miles northeast of Marshall, Texas, and approximately 40 miles northwest of Shreveport, Louisiana. The site is in a rural area and operated from 1942 to 1997, historically manufacturing TNT, rocket motors and various pyrotechnic items.

The site is a federal facility.  The Army is the lead agency with oversight by the EPA and State of Texas.  Remediation and monitoring activities are ongoing for multiple sites within LHAAP.  In addition, a ground water treatment plant is operated and maintained for treatment of groundwater extracted from sites LHAAP-16, -18 and -24.


Civilian Exposure Longhorn

Chemicals found:

  • TCE
  • DCE
  • Benzene
  • Arsenic
  • Barium
  • Cadmium
  • Chloride
  • Chromium
  • Iron
  • Lead
  • Nickel
  • Perchlorate


*Note – We’ve posted, verbatim, the information from the EPA on Longhorn on this page rather than simply sharing a link.  This is to maintain an ongoing record of the information to-date as of October 2015, in the event it is edited or removed from their site in the future. You can view the link to the EPA page at the bottom of this post.

For more details on Longhorn, visit this link: Longhorn Army Ammunition Plant – EPA Superfund Site


Document Link: EPA Final 5-Year Review Document (PDF)



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Civilian Exposure

Civilian Exposure is a 501(c)(3) tax-exempt nonprofit organization/public charity working to Build Awareness, Accountability and Assistance for Civilians Exposed to Camp Lejeune Water Contamination and all citizens exposed to any toxic contamination aboard all U.S. military installations. The effort continues to inform civilian employees and others affected by contamination to receive both the guidance and the justice they deserve.

About the Founder
A 20-year veteran of media, marketing, non-profits and entrepreneurship, Gavin P. Smith leads Civilian Exposure, a non-profit assisting civilians and veterans exposed to U.S. military contamination; the Keta Foundation, a collaborative foundation dedicated to mitigating modern slavery through economic improvement projects in Africa; and Gavin Consulting, a network of virtual experts serving global clients; He is also a former member of the CDC/ATSDR Camp Lejeune Community Assistance Panel. Mr. Smith holds a Master of Global Management with distinction (Beta Gamma Sigma) from Thunderbird School of Global Management, an MBA from The College of William & Mary Mason School of Business and a BA in History from Wake Forest University.

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