Inspectors — Certificate of competency.
RCW 70A.105.110
in effect*** CHANGE IN 2026 *** (SEE 6291.SL ) ***
(1) The local board of health shall ensure that individuals who conduct inspections of on-site wastewater treatment systems or who otherwise conduct reviews of such systems are qualified in the technology and application of on-site sewage treatment principles. A certificate of competency issued by the state board of registration for professional engineers and land surveyors is adequate demonstration that an individual is competent in the engineering aspects of on-site wastewater treatment system technology. (2) A local board of health may allow noncertified individuals to review designs of, and conduct inspections of, on-site wastewater treatment systems for a maximum of two years after the date of hire, if a certified individual reviews or supervises the work during that time.
(1) The local board of health shall ensure that individuals who conduct inspections of on-site wastewater treatment systems or who otherwise conduct reviews of such systems are qualified in the technology and application of on-site sewage treatment principles. A certificate of competency issued by the state board of registration for professional engineers and land surveyors is adequate demonstration that an individual is competent in the engineering aspects of on-site wastewater treatment system technology.
(2) A local board of health may allow noncertified individuals to review designs of, and conduct inspections of, on-site wastewater treatment systems for a maximum of two years after the date of hire, if a certified individual reviews or supervises the work during that time.
Source: WA Statutes (Official Site)URL: https://app.leg.wa.gov/RCW/default.aspx?cite=70A.105&full=trueFetched: 6/29/2026