Defiance Dump is a superfund site located at Old Colony Rd, Defiance, MO 63341. The Environmental Protection Agency (EPA) identifies sites such as Defiance Dump 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. Defiance Dump is currently registered as an Archived superfund site by the EPA and does not require any clean up action or further investigation at this time.