Three Mile Island Nuclear Generating Sta is a superfund site located at Rte 441, Middletown, PA 17057. The Environmental Protection Agency (EPA) identifies sites such as Three Mile Island Nuclear Generating Sta 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. Three Mile Island Nuclear Generating Sta is currently registered as an Archived superfund site by the EPA and does not require any clean up action or further investigation at this time.