Seven types of drilling licenses are available:
Wash. Admin. Code § 173-162-055
Statutory Authority: Chapter 18.104 RCW. 06-23-121 (Order 06-08), § 173-162-055, filed 11/21/06, effective 12/22/06. Statutory Authority: Chapter 18.104 RCW and RCW 43.21A.080. 98-08-031 (Order 97-08), § 173-162-055, filed 3/23/98, effective 4/23/98.