You must keep each analysis using medical or exposure records for at least thirty years.
Wash. Admin. Code § 296-802-20015
Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. 04-10-026, § 296-802-20015, filed 4/27/04, effective 8/1/04.