Hassayampa Landfill is a superfund site located at Old Wickenburg Rd, Hassayampa, AZ 85343. The Environmental Protection Agency (EPA) identifies sites such as Hassayampa Landfill 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. Hassayampa Landfill is currently registered as an Active NPL superfund site by the EPA. Because it is on the NPL (National Priorities List), Hassayampa Landfill is considered one of the worst hazardous waste sites identified by the EPA.