What is the required vertical separation distance between the bottom of the system and the top of the limiting layer?

The required vertical separation distance between the bottom of the septic system and the top of the limiting layer is critical for ensuring proper functioning and preventing contamination. A separation of 2 feet is required to provide adequate buffer space for the effluent from the system to be treated effectively by the soil. This distance helps to ensure that there is sufficient soil material to filter and treat the effluent before it reaches the limiting layer, which can include impermeable surfaces such as bedrock or a water table. Proper separation helps prevent saturation and the potential for untreated wastewater to rise to the surface or contaminate groundwater.

In contrast, distances that are shorter may not provide enough filtering capacity, which can jeopardize the system's ability to treat wastewater adequately. Additionally, greater distances than the required 2 feet may not always be practical or necessary, leading to unnecessary costs and challenges in installation. Understanding these separation requirements is essential for compliance with regulations and for safeguarding public health and the environment.