Iron Mountain Mine is a superfund site located at Off Hwy 299 9 Mi Nw Of, Redding, CA 96001. The Environmental Protection Agency (EPA) identifies sites such as Iron Mountain Mine 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. Iron Mountain Mine is currently registered as an Active NPL superfund site by the EPA. Because it is on the NPL (National Priorities List), Iron Mountain Mine is considered one of the worst hazardous waste sites identified by the EPA.