Slow-draining sinks, tubs, or toilets
Gurgling sounds in drains or plumbing
Sewage odors around the cesspool or yard
Wet, soggy, or unusually lush ground above the cesspool
Sewage backing up into toilets, tubs, or floor drains
Standing water near the cesspool area
Frequent need to pump the system
Toilets flushing weakly or not fully clearing
Wastewater surfacing in the yard
Professional inspection or pumping report showing high sludge level