DIY Leak Detection in a Slab


Water leaking or leaked in a home's basement can lead to a damaged foundation, resulting in hefty repair costs. You can detect water leakage in the concrete slab of your basement floor. No specialized tools are needed, but some supplies from around the home will be required. The earlier you can determine that water is leaking on your concrete slab, the sooner you can fix the problem.

Things You'll Need

  • Flashlight
  • Water bills
  • Paper
  • Pencil
  • Aim a flashlight at the base of the hot water heater, the washing machine and any other appliance seated on the concrete slab floor in the basement. Play the beam from the flashlight around the appliance to look for any trace of water. Run your hand around the base of the appliance and out from the appliance to feel for water that might be leaking into the concrete slab.

  • Add up your water bills for this year and write the number down. Add up your water bills for the same amount of time for the previous year and write the number down. Compare the total for the two years to see if the cost for the present year is much greater than that of the previous year. If so, water may be leaking from an appliance in the basement and most likely has leaked into the concrete slab.

  • Run your hand along those edges of the concrete slab floor that are on an incline to feel for moisture that indicates water has leaked beneath the slab.

  • Run your hand over any cracks or breaks in the concrete slab floor to feel for moisture. If your hand comes away wet, there is water that has leaked beneath the concrete slab.

Tips & Warnings

  • A leak detector alarm device can be installed against the base of an appliance in the basement. This device will alert you when water is detected.


  • Photo Credit Jupiterimages/Comstock/Getty Images
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