(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.