Washington Process Server Licensing Requirements
In order to serve legal papers in the state of Washington, an individual must first register with their county's auditor and pay $10. There is no testing or requirement for insurance or bonding as well - this means that it could be dangerous if you don't know what your doing.
Rule 4 Washington Sate Courts
These are the general guidelines regarding Washington rules of Civil Procedure
(a) Summons - Issuance.