Big Hole Post Plant is a superfund site located at 1103 South Atlantic, Dillon, MT 59725. The Environmental Protection Agency (EPA) identifies sites such as Big Hole Post Plant 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. Big Hole Post Plant 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.