Wash. Admin. Code § 296-835-12035
You must make sure any portable container used to add liquid to the tank is:
[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. WSR 17-18-075, § 296-835-12035, filed 9/5/17, effective 10/6/17. Statutory Authority: RCW 49.17.010, [49.17].040, and [49.17].050. WSR 02-15-102, § 296-835-12035, filed 7/17/02, effective 10/1/02.]