1st to do when you have a plumbing water line leak inside a wall or under the slab.

1. If your main water shut off is outside, which is generally the case here in Florida; you go outside and turn it off. The shut-off is generally attached to a pipe coming up out of the ground and going into your home.

(There is also another shut-off at the water meter, which is generally located on your front property line or sometimes on your rear property line. You should remember seeing it when mowing the lawn. In the event your shut off handle is stuck where you are unable to open it, turning the meter off would be the next viable step. If the meter can is to be turned off, it really should be turned off by your local water utility company, or by a licensed plumber; simply because you do not want to damage the meter, which could be costly should the utility company find it was you that damaged it.)

2. Unscrew your hose from your house and open the valve to release the built up water pressure so that additional water does not flow into your home.

3. Turn the power switch off to your Hot Water Heaters so that in the event water drains from your HWH, the elements don't burn up. This may prevent you from having to install new elements in your HWH, or even worse, prevent you from having to install a new HWH due to the elements being stuck in place as a result of calcium buildup, which generally requires replacing the HWH with a new one; adding additional expense to an already costly problem.