How many inches of suitable soil are required between an absorption field trench and the groundwater table?

The requirement for the suitable soil depth between an absorption field trench and the groundwater table is critical for effective drainage and wastewater treatment. A depth of 24 inches is necessary to ensure that effluent from the absorption field is adequately treated by soil before reaching the groundwater. This depth helps to prevent contamination of groundwater resources, which can occur when wastewater comes into direct contact with the water table.

Additionally, having this buffer of suitable soil allows for the natural filtration processes to occur, where bacteria and other microorganisms in the soil help to break down pollutants, thereby reducing the risk of harmful substances leaching into the groundwater. The 24 inches requirement is a standard regulation in many environmental health practices, reflecting a balance between practical installation of septic systems and environmental protection.