Table 4 lists by name the soil series that are in the range of soil depths and permeabilities to be unsuited for dispersal systems. The 92 soil series are present in 19% of Ohio's land area. These soils are saturated with water within 1 foot of the ground surface for several months in most years. One of these soils is presented in Figure 11. In some of these soils the water rises above the surface of the ground. Wetland plants, like cattails, are good indicators of these seasonally saturated soils. It may be necessary to check the soil depth to a limiting condition in a soil pit before designing, building, or approving a wastewater treatment system.