A good rule of thumb is to have your sewer lines and drains cleaned every 18 to 22 months. This will keep your lines flowing efficiently and prevent costly damage. However, don't hesitate to call a plumber for drain cleaning if you notice these problems: Raw sewage backup in your drain, bathtub, or toilet Gurgling sounds from the pipes Water puddles around the floor drain in your basement Multiple clogged drains or recurring clogs Strange odors from the drains