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Percolation Test


If you're planning to install a new septic system, local ordinances will require you to conduct a soil percolation test. 

A percolation test, or perc test is a test to determine the water absorption rate of soil in preparation for the building of a septic drain field (leach field). The results of a percolation test are required to properly design a septic system.


Percolation testing is observing how quickly a known volume of water dissipates into the subsoil of a drilled hole. 

Sandy soil will absorb more water than soil with a high concentration of clay or where the water table is close to the surface.

A percolation test consists of excavating one or more holes in the soil of the proposed leach field to a specified depth, presoaking the holes by maintaining a high water level in the holes, then running the test by filling the holes to a specific level and timing the drop of the water level as the water percolates into the surrounding soil. 

Sim Sanitation, Inc.
California Contractors License No. 939122
20021 West Valley Blvd., Suite A
Tehachapi, CA. 93561
ph: (661) 823-8442
fax: (661) 823-4174
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