The first place to check is the plumbing pipes above the water heater.
Heater tank leaking.
If this is a gate style valve a wheel that turns turn the valve clockwise as far as you can.
Water heaters can leak due to a number of problems including loose valves excessive pressure in the tank or issues with the pipes that connect to the unit.
Your water heater tank should have a dedicated shutoff valve on the cold inlet pipes.
With electric water heaters leaks can spring from the gaskets that seal the heating elements to the tank turn off the electrical power and shut off the tank s water supply.
And if your water heater is more.
If age and deterioration is the cause of your leak you will need to call a professional plumber to replace your water.
If you experience a leaking water heater it is recommended to turn off the water to your tank.
Leaks from electric water heater s heating element gasket.
As discussed above when sediment builds up in the bottom of a water tank for years and years it will eventually corrode through the bottom of the tank and begin to leak.
Turn off the water.
See the article electric water heater repair and troubleshooting for information on removing the heating element and replacing the gasket.
Normally replacing a water heater should be done by a professional but if you re a diyer you can do it yourself.
Lastly the most common cause of a leaking water tank.
A drip from above can easily leak down on top of the water heater and even work its way down the insulation and make it look like the leak is coming from the tank itself.
Check the plumbing pipes above the water heater using a stepladder if necessary.