Risco Ex Auxiliary Field 3 is a superfund site located at 2 Miles W Of Risco, Risco, MO 63874. The Environmental Protection Agency (EPA) identifies sites such as Risco Ex Auxiliary Field 3 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. Risco Ex Auxiliary Field 3 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.