Cleff Howard Sia is a superfund site located at Sec28 T3n R9e, Noble Twp, IL 62439. The Environmental Protection Agency (EPA) identifies sites such as Cleff Howard Sia 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. Cleff Howard Sia 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.