Washington Application for Plumber Trainee Certificate is a document used to apply for a certificate to become a plumber trainee in the state of Washington. It is required for individuals to have a valid certificate in order to practice plumbing in Washington. The application includes basic information about the applicant such as name, address, and contact information as well as work experience and educational background. Additionally, applicants must have a valid Washington state driver’s license or ID card in order to apply. There are two types of Washington Application for Plumber Trainee Certificate: Initial Certificate and Renewal Certificate. Initial Certificate is for new applicants who have never held a Plumber Trainee Certificate in Washington before. Renewal Certificate is for current certificate holders who need to renew their existing certificate. Both applications require a passing score on the Plumbing Trainee Exam and a Washington State background check.