Read the warning signs
Biggest signs of a clogged drain
Gurgling, chugging or sloshing sounds can occur alongside slow-flowing fixtures and unpleasant drain odors. These changes may appear before a complete blockage. Note whether the sound comes from the fixture in use or another drain, and whether more than one outlet is affected.
A backup is more than an inconvenience to keep testing. Stop using an overflowing or backed-up fixture and report the active condition. Sounds and smells are useful clues, but they cannot establish the location or cause of the restriction by themselves. An evaluation is needed before choosing the work.
