The recommended backfill depth over the absorption field is?

The recommended backfill depth over the absorption field is 8 to 12 inches. This depth is crucial for ensuring adequate soil coverage while allowing for proper drainage and aeration necessary for the effective functioning of the absorption field.

Backfilling within this range helps prevent excessive pressure on the soil, which could impede the treatment process and possibly lead to system failure due to soil compaction. Furthermore, a depth of 8 to 12 inches strikes a balance between protecting the absorption field from surface activities and maintaining appropriate soil moisture and temperature conditions, both of which are vital for the microorganisms responsible for treating wastewater in these systems.

Using this specific range of backfill helps to optimize the absorption and treatment capabilities of the field, providing both performance and longevity for the sewage disposal system.