If your toilet makes gurgling noises, it should be diagnosed as soon as possible When the system runs smoothly, the air freely flows through the pipes to efficiently remove waste.
Gurgling indicates an issue with negative air pressure, which forces air back through pipes into the toilet. This could be the result of a blockage or some other issues. Follow these steps to troubleshoot and repair the gurgling.
Check the Fill Valve and Tank Equipment
Malfunctioned parts inside the toilet can cause the gurgling and bubbling noises. Remove the tank lid and set it on a heavy towel or blanket.
Flush the toilet and watch for bubbles around the fill tube, the larger pipe in the middle of the tank. Get the fill tube replaced if you notice bubbling or gurgling around it. Replace damaged flappers and floats.
Unclog the Drain Line
Cover drains in all tubs or sinks with duct tape or masking tape, or the water could back up through other drains. Attempt to unclog the drain line with a plunger positioned over the bowl opening using ten to fifteen rapid pumping motions. This should help dislodge small clogs or objects stuck in the pipes.
If the plunger doesn't work, try unclogging the drain using a toilet auger, or snake, which is a long, flexible wire with teeth. Insert the end of the auger into the toilet hole and keep unwinding it until you hit a blockage, then pull it back up to remove the object.
If the standard auger doesn't work, rent a motorized model from a home improvement center. Find the sewer clean-out plug, or remove the toilet from the base by detaching the bolts, and gently set the toilet on a soft surface. Insert the auger into the drain pipe or plug, and attempt to remove the blockage.
Clean the Plumbing Vent
The plumbing vent is a black pipe on top of the roof that removes sewer gases. If you don't mind heights, set a ladder to access the roof, and use a ladder stabilizer or an assistant to hold it for you. Get the assistant to watch the toilet for you, after you remove blockages.
Wear plastic gloves and carry a flashlight, nylon string, garden hose, and a yardstick with you. Secure the flashlight to the string, and lower the flashlight in the vent pipe opening.
If you see an obstruction near the top, remove it by hand, using the yardstick to dislodge the blockage, or run a hose pipe on full pressure down the vent to remove heavier blockages. If that doesn't help, run an auger down the vent or hire a professional who offers plumbing services.