The absence of commercial facilities to recycle or recover value from wood treated with metal-based wood preservatives at the end of its service life is one of the most significant negative points in the generally positive life cycle analysis of treated wood. An experiment was initiated to determine whether wood treated with carbon-based preservatives could be degraded by composting without residual preservative contamination. After one year the concentration of azoles remained high, while the concentration of DDAcarbonate was greatly reduced. Several fungal isolations were made from the compost mixtures. More time is needed to complete the composting process.