The pressure treating industry has many preservatives available. Few of them are suitable for timber piling. Preservatives used to pressure treat utility poles such as pentachlorophenol and copper naphthenate are not suitable for salt water applications and since most timber piling installations in the water are salt water applications, they cannot be used. Copper Chromated Arsenate (CCA) is the most prevalent preservative used to treat Southern Pine marine piling. Creosote is also used. For Douglas fir piling Ammoniacal Zinc Arsenate (ACZA), which was formu-lated years ago to treat Douglas fir, and creosote are used in the West for foundation piling.