CCA is short for chromated copper arsenate and is used for pressure treating agriculture wood posts to prevent rot, decay, and insect damage. We manufacture our wood posts to various lengths and diameters using only southern yellow pine. After a period of drying, we pressure-treat them with CCA to preserve the wood. The retention standard for CCA in treated posts in the agricultural industry is .40 pounds of preservative per cubic foot (pcf). We do not recommend using wood posts for fencing that have not retained at least .40 pcf of CCA.