01
HOW A SEPTIC SYSTEM WORKS
All water runs out of your house from one main drainage pipe into a septic tank. The septic tank is a buried, water-tight container usually made of concrete, fiberglass, or polyethylene. The liquid wastewater (effluent) then exits the tank into the drain field. The drain field is a shallow, covered, excavation made in unsaturated soil. Pretreated wastewater is discharged through piping onto porous surfaces that allow wastewater to filter through the soil. Finally, the wastewater percolates into the soil, naturally removing harmful coliform bacteria, viruses and nutrients. The recycled water then returns to underground aquafers.