A depth to the water table of six inches generally requires which type of system?

A depth to the water table of six inches typically necessitates the use of a sand mound system. This is largely due to the shallow depth to the water table, which presents challenges for wastewater treatment methods that rely on soil absorption, such as conventional septic systems.

Conventional septic systems typically require a certain depth between the bottom of the septic drain field and the water table to ensure effective filtration of effluent through the soil. With only six inches of separation, there is a significant risk that wastewater could contaminate the groundwater.

A sand mound system, on the other hand, is designed to accommodate high water tables. It involves constructing a mound of sand that elevates the drain field above the natural ground level, allowing for adequate drainage and treatment of effluent while preventing contamination of the water table. This method effectively creates more space for soil treatment and filtration, making it ideal for sites with shallow water tables.

Commercial waste treatment systems and holding tanks are generally reserved for different specific conditions and are not typically employed merely due to shallow water tables, while the conventional septic system is unsuitable in this scenario.