Section R317-11-3 - Classes of Certification3.1 There are three classes of onsite professional certification, Level 1 being the lowest and Level 3 being the highest: A. Level 1, soil evaluations and percolation testing;B. Level 2, design, inspection and maintenance of conventional underground wastewater disposal systems, including soil evaluations and percolation testing; andC. Level 3, design, inspection and maintenance of alternative or conventional underground wastewater disposal systems, including soil evaluations and percolation testing.Utah Admin. Code R317-11-3