Look for a shut off valve on the water line that leads to the sink or toilet and turn clockwise (Righty-Tighty; Lefty-Loosey).
FIND THE MAIN WATER SUPPLY VALVE
There are many situations where you can't find where the leak is coming from or find a valve to shut off the water supply. There is a main water supply valve located in the basement, near the water meter or near the street under a manhole cover.
If you are reading this and your house is not currently flooding, check out this how-to article about locating your
water shut off valve. If you currently have a water leak and know where your water meter is located, follow a direct line from the water meter to your house and look for the shut off valve. If you still can't find it, call the city water
department or contact an emergency plumber.