Cleaning your septic tank is the key to the life of your septic system. The purpose of the septic tank is to separate the wastewater from the solid waste and allow only the wastewater to enter the soil absorption field. The less frequently the tank is cleaned, the more solids are likely to enter the soil absorption field. When this occurs, your soils and drainfield will clog and lead to system failure. In most instances, the entire system will have to be brought up to current regulations set by the Texas Commission on Environmental Quality (TCEQ) and your local permitting authority, which usually requires an entirely new system.