Step 7 · Test for Leaks

Now for the final test. Slowly turn the water shutoff valve counter-clockwise to turn the water back on. Listen for the tank to fill. Check the supply line connection for any drips. Once the tank is full and the fill valve shuts off, flush the toilet. As the water rushes into the bowl and down the drain, use a flashlight to carefully inspect the entire base of the toilet where it meets the floor. Look for any signs of water seeping out. Use a dry paper towel and wipe it around the base; it will show even the smallest amount of moisture. Flush the toilet several more times and continue to inspect for leaks.