RCW 48.62.151

A joint self-insurance program approved in accordance with this chapter is exempt from insurance premium taxes, from fees assessed under chapter 48.02 RCW, from chapters 48.32 and 48.32A RCW, from business and occupations taxes imposed under chapter 82.04 RCW, and from any assigned risk plan or joint underwriting association otherwise required by law. This section does not apply to and no exemption is provided for insurance companies issuing policies to cover program risks, nor does it apply to or provide an exemption for third-party administrators, surplus line brokers, or insurance producers serving the self-insurance program.