Milltown Reservoir Sediments is a superfund site located at Adjacent To Se Side Of Twn, Milltown, MT 59851. The Environmental Protection Agency (EPA) identifies sites such as Milltown Reservoir Sediments 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. Milltown Reservoir Sediments is currently registered as an Active NPL superfund site by the EPA. Because it is on the NPL (National Priorities List), Milltown Reservoir Sediments is considered one of the worst hazardous waste sites identified by the EPA.