Old Bethpage Landfill is a superfund site located at Round Swamp Rd, Oyster Bay, NY 11804. The Environmental Protection Agency (EPA) identifies sites such as Old Bethpage 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. Old Bethpage Landfill is currently registered as an Active NPL superfund site by the EPA. Because it is on the NPL (National Priorities List), Old Bethpage Landfill is considered one of the worst hazardous waste sites identified by the EPA.