A percolation test, often shortened to “perc test,” is a soil assessment conducted to determine the water absorption rate of the ground. This analysis gauges the suitability of the soil for a septic drain field, leach field, or infiltration basin. The procedure typically involves digging a hole of specific dimensions in the area of the proposed drain field and saturating the soil with water. The rate at which the water level drops is then measured, typically in inches per hour, providing a quantifiable measure of the soil’s permeability.
The significance of this evaluation lies in its role in ensuring the proper function of onsite wastewater disposal systems. Accurate determination of soil permeability is essential for designing a drain field that can effectively treat and dispose of wastewater without contaminating groundwater or causing surface water pollution. The process also dictates the size and design specifications of the required drain field, impacting cost and the amount of land required. Historically, reliance on these tests has been central to public health initiatives related to sanitation in areas not served by centralized sewer systems.
