Why Knowing the Signs of Septic System Problems Can Save You Thousands Septic tank services are something most homeowners don't think about — until something goes wrong. Here are the most common signs you need septic service right away: Slow drains throughout the house Sewage odors inside or outside Gurgling sounds from toilets or drains Pooling water or unusually lush grass over the drain field Sewage backup in sinks, tubs, or toilets If you're seeing any of these, your syst