General.
The department will issue an original trainee certificate when the trainee applicant submits a complete trainee certificate application including:
One appropriate domestic pump specialty plumber or one journey level plumber working on a domestic pump system may supervise no more than three trainees, after December 31, 2025, no more than two trainees can be supervised. Supervision must be a minimum of seventy-five percent of the time spent on each and every job site.
A plumber trainee or specialty plumber who has a current trainee certificate with the state of Washington and has successfully completed or is enrolled in an approved medical gas piping installer training course may work on medical gas piping systems. Work may only occur when there is direct supervision by an active Washington state certified journey level plumber with an active medical gas piping installer endorsement issued by the department. Supervision must be one hundred percent of the time spent on each and every job site on a one-to-one ratio.
A backflow specialty plumber, a journey level plumber on a commercial job site, or a residential specialty plumber on a residential job site must supervise one backflow trainee to perform maintenance and repair work on every backflow assembly on potable water systems inside every commercial or residential building. The ratio must be one to one for one hundred percent of the time on each and every job site.
Wash. Admin. Code § 296-400A-120
Statutory Authority: RCW 18.106.040 and 18.106.140. 10-06-051, § 296-400A-120, filed 2/24/10, effective 4/1/10; 09-10-080, § 296-400A-120, filed 5/5/09, effective 6/5/09; 06-24-040, § 296-400A-120, filed 11/30/06, effective 12/31/06. Statutory Authority: RCW 18.106.040, 18.106.140, 2002 c 82, and 2003 c 399. 04-12-046, § 296-400A-120, filed 5/28/04, effective 6/30/04. Statutory Authority: RCW 18.106.040, 18.106.140, 2001 c 281, and chapter 18.106 RCW. 02-14-074, § 296-400A-120, filed 6/28/02, effective 7/1/02. Statutory Authority: Chapter 18.106 RCW. 98-13-126, § 296-400A-120, filed 6/17/98, effective 7/20/98. Statutory Authority: RCW 18.106.050, [18.106.]070, [18.106.]110, [18.106.]125,[18.106.]140 and [18.106.]270. 97-11-052, § 296-400A-120, filed 5/20/97, effective 6/30/97.