Easy Way To Find A Water Leak Underground. If the leak is underground, it’s nearly impossible for you to locate its exact position. To find water leak problems at your place, you can do a very simple test that only takes 10 minutes or so.
Use a piece of tape or grease pencil to mark the water level. Check the gauge and see if the needle has moved from your original mark. In most homes this will be the valve after your backflow preventer.
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In most homes this will be the valve after your backflow preventer. If you find that the coloring solution has altered the water in the bowl, then there’s most likely a leak. Below are written instructions for checking for leaks. Check the mark 24 hours later.