Harvard Ex Tar Rng is a superfund site located at 4 Miles Nw Of Harvard, Harvard, NE 68944. The Environmental Protection Agency (EPA) identifies sites such as Harvard Ex Tar Rng 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. Harvard Ex Tar Rng 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.