Yes. If you decrease the declared gross weight, you must surrender the current gross weight license.
Wash. Admin. Code § 308-96A-206
Statutory Authority: RCW 46.01.110, 46.16.070 and 46.16.135. 02-11-095, § 308-96A-206, filed 5/20/02, effective 6/20/02; 99-01-133, § 308-96A-206, filed 12/21/98, effective 1/21/99. Statutory Authority: RCW 43.17.060, 46.01.060, 46.16.070 and 46.16.135. 92-02-100, § 308-96A-206, filed 1/2/92, effective 2/2/92.