Mound Systems are an option in areas of shallow soil depth, high groundwater or shallow bedrock. The constructed sand mound contains a drainfield trench. Effluent from the septic tank flows to a pump chamber where it is pumped to the mound in prescribed doses. Treatment of the effluent occurs as it discharges to the trench and filters through the sand, and then disperses into the native soil.

While Mound Systems can be a good solution for certain soil conditions, they require a substantial amount of space and periodic maintenance.