Helena Chemical Co Hayes Samon is a superfund site located at 602 Holland Avenue, Mission, TX 78572. The Environmental Protection Agency (EPA) identifies sites such as Helena Chemical Co Hayes Samon 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. Helena Chemical Co Hayes Samon 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.