Phone answered 24/7 · Mesquite, TX and nearby communities

Call 24/7: (214) 983-0952
Duck Creek Water ResponseWater Damage Help · Mesquite, TX

Underground Water Leaks: Signs and How Pros Find Them

Last updated October 25, 2026

Call Now (214) 983-0952

The short answer

Signs You Might Have an Underground Leak

Watch for patches of grass that stay greener or grow faster than the rest of the yard, especially during dry spells. Also notice if the soil feels spongy or if water pools in places that haven't seen rain. A sudden jump in your water bill without a change in usage is a strong clue.

Inside the house, listen for the sound of running water when all taps are off. Check the water meter; if the dial moves while nothing is running, water is escaping somewhere. Cracks in the foundation or a damp spot on a wall that faces the yard can also point to an underground issue.

  • Unexplained wet areas in the lawn
  • Dirt or mud washing into the driveway
  • A hissing or rushing sound near the ground
  • Foundation cracks that appear or widen
  • Water meter moving with all fixtures off
  • A drop in water pressure at the taps

Why Underground Leaks Are Hard to Spot

The leak is hidden from view, and the soil can absorb water for a long time before any surface sign appears. The leak may be under a concrete slab, under a flower bed, or deep in the ground, so the water travels sideways before it shows up. Also, the leak can be small, losing only a few gallons a day.

By the time you notice a wet spot or a higher bill, the leak may have been running for weeks. The longer it runs, the more it can erode soil under your foundation or slab, leading to settling and cracks. Acting quickly when you suspect a leak helps limit damage to your home's structure.

How Pros Trace the Source

Local water damage pros use a few methods to find an underground leak without digging up your whole yard. They can do a pressure test on the pipes to confirm a leak exists, then use acoustic listening devices to hear the water escaping. Electronic leak detectors can pick up the sound of water moving through the ground.

The pros may also use thermal imaging to spot temperature differences in the soil, or they may inject a harmless dye into the system to trace where the water exits. Once the leak is located, they can dig a small access hole to repair the pipe. The approach depends on the pipe material, the depth, and what is above it.

What to Do While You Wait for Help

If you suspect an underground leak, turn off the water at the main shutoff valve to stop further water loss and prevent more damage. Write down the location of your shutoff valve now, so you can find it quickly later. If you live in Mesquite, keep the valve location written down and share it with everyone in the household.

Also, take photos of any wet spots, cracks, or unusual readings on your water meter. This documentation can help you explain the situation to your insurance company. Policies vary, and your insurer decides what is covered. Do not attempt to dig near the suspected leak, as you may hit a gas or electrical line.

When to Call the Pros

Call the pros as soon as you notice the signs, because the leak will not fix itself. The longer you wait, the more water seeps into the ground and the more damage it can cause to your foundation, landscaping, or crawlspace. If water is pooling near the house, it can also lead to mold or wood rot.

The cost to repair an underground leak often ranges from a few hundred to several thousand dollars, but it depends on the leak's location, the pipe material, and how deep the pipe is. A leak detection service can pinpoint the problem so you can repair it before it becomes a bigger issue. If water has already entered your home, you may also need extraction and drying.

Talk to someone now

Phones are answered 24/7 for Mesquite and nearby communities.

Call Now (214) 983-0952

Frequently asked questions

How do I know if the leak is underground or in the house?

Check the water meter: turn off all fixtures, then watch the meter. If it still moves, the leak is in the supply line, which could be underground or in the walls. If you see wet spots in the yard or hear running water outside, it is likely underground.

Can an underground leak damage my foundation?

Yes. Water erodes soil under the foundation, which can cause settling and cracks. The longer the leak runs, the more soil is washed away. In a humid subtropical climate with hot summers and spring hail and thunderstorms, heavy rain can mask the leak, so act quickly.

Will my insurance cover the repair?

Policies vary, and your insurer decides what is covered. Some policies cover water damage from a sudden leak, but not the cost to repair the pipe itself. Check your policy or ask your insurance company about the specifics of your situation.

Call Now (214) 983-0952