All applicants for licensure under this chapter, except as provided in RCW 18.210.180, must pass a written examination administered by the board and must also meet the following minimum requirements:

     (1) A high school diploma or equivalent; and

     (2) A minimum of four years of experience, as approved by the board, showing increased responsibility for the design of on-site wastewater treatment systems. The experience should include site soil assessment, hydraulics, topographic delineations, use of specialized treatment processes and devices, microbiology, and construction practices. Completion of satisfactory college level coursework or successful participation in a board-approved internship or mentoring program may be substituted for up to two years of the experience requirement.

[2011 c 256 § 6; 1999 c 263 § 11.]