What is the purpose of the soil percolation test?

The purpose of the soil percolation test is to determine the suitability for subsurface disposal systems, such as septic systems. This test measures the rate at which water moves through the soil, which is crucial for assessing whether the soil can adequately absorb and treat wastewater from a septic system.

In the context of subsurface disposal systems, proper percolation rates are necessary to ensure that effluent can be sufficiently treated before it enters the groundwater. If the soil percolation rate is too slow, it can lead to effluent buildup, potentially causing failures or environmental contamination. Conversely, if the percolation rate is too fast, it may not allow for proper treatment of the wastewater, also leading to risks of contamination.

In contrast to evaluating groundwater contamination levels, assessing soil fertility for agricultural use, or checking for seismic activity, the focus of the percolation test is specifically on the soil's capacity to handle wastewater treatment through subsurface systems. Therefore, understanding the percolation characteristics of the soil is integral to the design and functionality of these systems.