The Wood Preservative Science Council (WPSC) is a trade association of manufacturers of water borne wood preservatives. It supports and participates in objective, sound scientific analysis of water borne wood preservatives with a focus on chromated copper arsenate (CCA. We are supported by our members, Arch Wood Protection, Inc., and Osmose Inc. The WPSC consults with the nation's leading experts in the fields of environmental science, epidemiology, risk assessment, and toxicology. The WPSC believes that CCA treated wood is safe when used as recommended.