A leaky toilet makes an irritating sound but also wastes dozens and dozens of gallons of water everyday.
The culprit most often is the rubber flapper at the bottom of the tank. Over time they can crack or become deformed so they don’t seal as well as they should. A replacement is only a few dollars and the fix just a few minutes.
First, turn off the water supply and empty the tank by flushing it. Remove the old flapper by unsnapping it where it is hinged at the base of the tower. You’ll also have to disconnect its chain from the flush lever.
The new flapper snaps right back in its place and its chain is then attached to the flush lever so there’s little or no slack when the flap is closed. Then turn back on the water supply and you’re done.