Soil Testing


A soil test must be performed prior to the installation of a subsurface on-site sewage system. There are two types of soil tests used to determine the characteristics of the soil on your property, the soil percolation test and the soil profile. Each of the tests requires three test holes to be dug or drilled in the location of the proposed on-site system.

Percolation tests may only be used to identify suitable areas for the conventional subsurface system, lagoon, or aerobic system with spray irrigation. These tests measure the drop of water within a specific time period. Test holes are pre soaked with water for a minimum of four hours, the water level is adjusted to a depth of 10 inches and the percolation rate is recorded. The on-site sewage disposal system is designed based on the percolation rate (inches of water dropped per minute).


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