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How to find a water leak on a concrete floor

Updated February 21, 2017

Some of the best-made homes built from the most solid material can need repairs once in a while. For example, even the highest quality pipes can spring a leak occasionally. Water leaks aren't just dangerous, as they create environments conducive to slip and fall accidents, but they cost you money, making your water bill higher than it should rightly be. Before you contact a professional repair person, locating the areas where the leak is occurring can save you time, expediting the process in its entirety.

Shut off all appliances that consume water in the building or house. Turn off all showers, sinks and washing machines as well as the controller to the sprinkler irrigation system, and turn off the irrigation valve manually.

Remove the lid from your meter cover and examine your water meter. If the indicator is spinning this indicates a leak in your house. If you don't have an indicator, but the meter's needle is moving, this indicates moving water in your system, meaning there's a leak. If the needle is not moving, take note of the position of the hand and wait 10 to 15 minutes. Check the meter again. If the needle has moved even slightly, you have a slow leak.

Walk around the concrete floor very quietly listening for the sounds of dripping or moving water. Follow the sounds of the water to their point of origin. This place will generally tell you where underneath your concrete floor the leak originates.

Examine the concrete floor with a torch. Look for water stains. Water stains accumulating or spreading in a particular area indicate the source of the leak.

Turn the water supply back on. Flush the toilet if there is one on the concrete floor. Shine your torch to see if water is leaking onto the floor when you flush. Shine your torch looking for drips from the nuts and bolts of the toilet. Look for water stains around the toilet.

Things You'll Need

  • Torch
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About the Author

Lane Cummings is originally from New York City. She attended the High School of Performing Arts in dance before receiving her Bachelor of Arts in literature and her Master of Arts in Russian literature at the University of Chicago. She has lived in St. Petersburg, Russia, where she lectured and studied Russian. She began writing professionally in 2004 for the "St. Petersburg Times."