Number: RL32412
Title: Arsenic-Treated Wood: Background and Overview
Authors: Michael M. Simpson, Resources, Science, and Industry Division 
Abstract: Beginning on January 1, 2004, the EPA no longer allowed use of chromated copper arsenate (CCA) to preserve wood intended for most residential uses: play structures, decks, picnic tables, landscaping timbers, residential fencing, gazebos, patios, and walkways. Wood treated prior to that date may still be used in residential settings, and CCA-treated wood in extant built structures is not affected. Meanwhile, the wood preservative industry has voluntarily converted to preservatives for residential wood uses that do not contain arsenic. While the EPA "does not believe there is any reason to remove or replace CCA-treated structures," arsenic is a known carcinogen in humans and any reduction in the levels of potential exposure to arsenic is desirable; the agency is continuing study of the entire range of CCA uses. Disposal of extant CCA-treated wood, export and possible import of CCAtreated wood and wood products, determination of the best ways to reduce arsenic exposure from extant wood, and possible adverse effects from nonarsenic wood preservatives are continuing concerns.
Pages: 8
Date: September 9, 2005