What is the primary concern when considering alternative wastewater treatment systems?

The primary concern when considering alternative wastewater treatment systems is the depth of impervious formations. This factor is critical because it affects the ability of the soil to absorb and treat wastewater. Impervious formations, such as bedrock or a thick clay layer, can impede the natural percolation process, leading to inadequate treatment of the wastewater and potential contamination of groundwater supplies.

When the depth of these formations is shallow, it limits the options for effective treatment systems because insufficient soil separation can lead to failures and environmental concerns. Understanding the geology of an area, including the depth and type of impervious layers, is essential for ensuring the proper design, placement, and function of alternative wastewater treatment systems. This consideration is fundamental to protecting public health and the environment, making it a primary concern in the planning and implementation of these systems.