Washington Plumber, Medical Gas, or Trainee Renewal is a certification program offered by the Washington State Department of Labor & Industries. It is designed to help individuals learn the skills and safety training necessary to become a professional plumber, medical gas installer, or trainee. The program offers licenses and certifications for both experienced professionals and individuals seeking to obtain their first license. The Washington Plumber certification program requires individuals to complete a minimum of 6,000 hours of plumbing-related work experience and to pass both a written and practical exam. Successful applicants will be issued a Washington State Plumber’s License. The Washington Medical Gas certification program requires individuals to successfully complete a minimum of 4,000 hours of medical gas installation work experience and to pass a written and practical exam. Successful applicants will be issued a Washington State Medical Gas Installer’s License. The Washington Trainee Renewal program is designed for individuals who have previously completed the Washington Plumber or Medical Gas certification program and are interested in renewing their certification. To renew their certification, individuals must complete a minimum of 2,500 hours of plumbing- or medical gas-related work experience and pass a written and practical exam. Successful applicants will be issued a Washington State Plumber or Medical Gas Installer’s License, depending on which certification they have renewed.