Coffeyville Ex Aux Fld 4 is a superfund site located at 3 Miles Sw Of Mound Valley, Mound Valley, KS 67354. The Environmental Protection Agency (EPA) identifies sites such as Coffeyville Ex Aux Fld 4 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. Coffeyville Ex Aux Fld 4 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.