Diaz Chemical is a superfund site located at 40 Jackson St. Area A, Holley, NY 14470. The Environmental Protection Agency (EPA) identifies sites such as Diaz Chemical 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. Diaz Chemical is currently registered as an Active NPL superfund site by the EPA. Because it is on the NPL (National Priorities List), Diaz Chemical is considered one of the worst hazardous waste sites identified by the EPA.