Why is my toilet noisy when it is flushed?

All toilets generally make some kind of noise. However, if your toilet seems excessively noisy it could be that the water flow to the tank is being restricted somehow. The ballcock assembly system is in charge of regulating the water supply to the tank. Should a part of this internal system not function right or perhaps is broken, it can cause major water flow issues. It is best to have your toilet looked at by a plumbing professional to determine the extent of the damage. You may need a whole new ballcock assembly system altogether.