This topic covers information related to septic tanks that are installed, as part of a septic system during construction. Septic systems are often installed in locations where that local jurisdiction has not provided sewage pipes for removal of wastewater and matter. Septic tanks act as a small scale treatment system, where an inlet allows sewage in. Sediment falls to the bottom and liquids leach out through a drain field. Regular cleaning and maintenance of septic tanks to remove solids is necessary.