It may look like a big sand box, but actually there is a leaching field underneath this sand. Since the leaching field is above natural grade, a rubber liner is installed around the entire leaching field to prevent the breakout of any waste water. This particular septic system install which is in Attleboro was a bit more complicated. The tank and pump chamber are located next to the house which is about 150′ away from the field. A pump sends the waste water through a 2″ pipe from the pump chamber to the distribution box (small box in the above picture) which is located at the beginning of the leaching field.