Maximum fill soil usage in a DIS is limited to what depth?

The maximum fill soil usage in a Drainage Infiltration System (DIS) is limited to a depth of 2 feet due to several critical factors related to the function and design of septic systems. This depth limit is established to ensure proper drainage and aeration, which are essential for the effective treatment of wastewater and to prevent issues such as soil saturation and reduced filtration capacity.

When fill soil is placed too deep, it can hinder the natural flow of water, leading to inadequate infiltration and potential overflow. Furthermore, excessive fill can exert pressure on the septic system components, increasing the risk of structural failure or malfunction. The 2-foot limit is a regulatory measure that helps maintain optimal conditions for the breakdown of waste materials while safeguarding the surrounding environment from potential hazards associated with poorly functioning systems. This depth helps to promote air exchange and water movement, which are vital for effective septic system operations.