To stop the water, remove the lid to your toilet tank and push the flapper down inside the tank to stop the water from exiting the tank and entering the bowl. As a last resort, turn off the water valve at the base of the toilet.  Use a plunger to try to remove the blockage. Fit the cup of the plunger tightly over the drain hole in the bottom of the bowl and start plunging until the blockage is removed.  If you still can’t remove the toilet clog, call Plumber Duck Inc. A toilet overflowing can be a sign of a larger plumbing issue