The need to pump out a cesspool can be indicated by several warning signs. There is a possibility of slow drains, clogged drains, or loud gurgling sounds coming from the drains in the house. Sewage backups can bring pungent odors into your home, causing health risks, and if ignored, can result in sludge overflowing and damaging your property. It is also possible for standing water to form above the tank, along with odors that indicate immediate action is necessary.