The septic system consists of a series of four steps.
2. Biological process occuring in the settling tank.
3. Dosing to the adsorbtion field.
If the complete septic system is working correctly, a homeowner may never even have to think about where his/her waste is going. However, failure of the system could cause major problems. The septic tank could overflow if the soil percolation is not rapid enough, if the drainage system is not designed well or if the tank itself is too small. The system can also fail by failure of the microorganisms to metabolize the waste. Detergents and bleaches in sufficient quantities can kill the microorganisms and making the septic system ineffective. Thus, because of failures and inefficient treatment, the system must be located far enough away from drinking water wells.