Wash. Rev. Code § 48.111.040
(1) Home heating fuel service contracts may not be issued, sold, or offered for sale in this state or sold to consumers in this state unless the contract provider has:
(2) In order to assure the faithful performance of a home heating fuel service contract provider's obligations to its contract holders, every home heating fuel service contract provider is responsible for complying with the requirements of one of the following:
(b)
(ii) Place in trust with the commissioner a financial security deposit, having a value of not less than five percent of the gross consideration received, less claims paid, on the sale of the service contract for all service contracts issued and in force, but not less than ten thousand dollars, consisting of one of the following:
[ 2006 c 36 s 5.]