What is the required depth of soil above the water table for a septic system to function effectively?

For a septic system to operate effectively, it is crucial to have a sufficient depth of soil above the water table. This depth is essential because it allows for adequate filtration and treatment of effluent before it reaches the groundwater. The minimum requirement is typically around 12 inches of soil above the water table. This depth ensures that the effluent can be properly treated by the soil microbes as it infiltrates through the soil layers.

When the soil depth is less than this minimum, there is a higher risk of effluent reaching the water table without sufficient treatment, potentially leading to groundwater contamination. Therefore, having at least 12 inches establishes a necessary barrier that promotes optimal soil treatment conditions, facilitating the function of the septic system.