How a Septic System Works

A septic system has two major components: a septic tank and a drain field. 

Waste water flows from the house to the septic tank. The tank is designed to retain waste water and allow heavy solids to settle to the bottom. These solids are partially decomposed by bacteria to form sludge. Grease and light particles float, forming a layer of scumon top of the waste water. Baffles installed at the inlet and outlet of the tank to help prevent scum and solids from escaping.