Imperium Grays Harbor Explosion is a superfund site located at 3122 Port Industrial Way, Hoquiam, WA 98550. The Environmental Protection Agency (EPA) identifies sites such as Imperium Grays Harbor Explosion 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. Imperium Grays Harbor Explosion is currently registered as an Active superfund site by the EPA. However, it is not on the NPL (National Priorities List), which means the EPA does not consider it one of the nation's most hazardous waste sites.