Slow-draining sinks, tubs, and toilets
Gurgling sounds in drains or plumbing
Sewage odors indoors or around the drain field
Standing water or soggy ground near the septic tank or drain field
Toilets backing up or flushing poorly
Sewage surfacing in the yard
Lush, unusually green grass over the septic area
Frequent need to plunge or clear drains
Alarm sounding on a septic system with a pump
It has been several years since the last pumping
Inspection shows sludge or scum levels are too high
Wastewater is not leaving the tank properly