Koppers Co Inc Texarkana Plant is a superfund site located at West 3rd St, Texarkana, TX 75501. The Environmental Protection Agency (EPA) identifies sites such as Koppers Co Inc Texarkana Plant because they pose or had once posed a potential risk to human health and/or the environment due to contamination by one or more hazardous wastes. Koppers Co Inc Texarkana Plant is currently registered as an Active NPL superfund site by the EPA. Because it is on the NPL (National Priorities List), Koppers Co Inc Texarkana Plant is considered one of the worst hazardous waste sites identified by the EPA.