Koppers Co is a superfund site located at Glen Arm Rd, Glen Arm, MD 21087. The Environmental Protection Agency (EPA) identifies sites such as Koppers Co 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 is currently registered as an Active superfund site by the EPA. However, it is not on the NPL (National Priorities List), which means the EPA does not consider it one of the nation's most hazardous waste sites.