Yes, based on RCW 43.22.434 the department may audit the records of contractors as defined in chapter 18.27, 18.106, or 19.28 RCW when the department has reason to believe that a violation of the permitting requirements has occurred.
Wash. Admin. Code § 296-150M-0715
Statutory Authority: RCW 43.22.340, 43.22.400, 43.22.432, 43.22.433, 43.22.434, 43.22.480, and 43.22.485, 2002 c 268, and chapter 43.22 RCW. 03-12-044, § 296-150M-0715, filed 5/30/03, effective 5/30/03.