Pressure Treating locates in Northern California The PST facility is located at 422 Mill Street in Weed, California. The facility occupies an area of approximately 40 acres. The facility was constructed in 1936 and the primary industrial activity is the treatment of wood with water-borne preservatives. The facility has two treatment cylinders, a high density incising system, a custom staining spray line and a guard rail/trailer pad manufacturing line that offers custom drilling ,cutting and treating.