Written examination — Minimum requirements.
RCW 18.210.100
in effectAll 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.
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.
Source: WA Statutes (Official Site)URL: https://app.leg.wa.gov/RCW/default.aspx?cite=18.210&full=trueFetched: 6/28/2026