What is the minimum depth required for the installation of a drainfield?

The minimum depth required for the installation of a drainfield is specifically designed to ensure proper drainage and performance of the on-site sewage facility. Setting the depth at 18 inches allows for adequate infiltration of effluent into the soil while also providing sufficient treatment of the wastewater.

This depth helps maintain the necessary aerobic conditions in the soil and promotes natural filtering processes that remove pathogens and contaminants from the wastewater before it reaches the groundwater. Additionally, it takes into account factors such as soil type, seasonal water tables, and frost depth, ensuring that the system operates effectively throughout various environmental conditions.

Maintaining this standard helps protect public health and environmental quality by ensuring that the effluent is treated properly within the soil's natural filtration system.