Signs Your Drains Are Clogged
Warning signs of a clogged drain line
Slow-draining drains could be a sign of a clogged or partially clogged drain.
Gurgling while draining is usually a sign of a partial blockage in the system. Vents in your home's Drain/Waste/Vent system promote airflow throughout the piping system. As water drains, the vents allow pressures to remain neutral throughout the system. As water flows through the pipe, a partial blockage will cut off that airflow. Usually, the air will pass, allowing the water to continue draining; but when a blockage closes off the pipe completely, the air will escape via the drain instead. This is why you may hear gurgling.
Unpleasant odors: Sewer gas is a generic term for the noxious mix of chemicals that are the by-product of decaying waste. You'll know you have a sewer gas problem if you smell the distinct odor of rotten eggs in your home.
Water coming back up your drains and other fixtures like toilets, bathtubs or washing machines and floor drains indicates a blockage. If you have a full blockage further down the line, you might experience backups from other fixtures in the home.