The short answer
Start with a Visual Walkthrough
Walk through each room and look at areas where water pipes run, such as under sinks, behind toilets, and near the water heater. Check for dampness, discoloration, or warping on walls and ceilings, which often signal a slow leak. Pay attention to floors near appliances like dishwashers and refrigerators, since even a small drip can cause hidden damage.
You can also run your hand along exposed pipes and joints to feel for moisture. Look for rust or mineral buildup on fittings, which happens when water seeps out over time. If you have a crawlspace or an unfinished area under the house, inspect those too, because leaks often travel along pipes or foundation cracks before you notice them in living spaces.
- Check under every sink for damp cabinet bases
- Look for water stains on ceilings and walls
- Feel exposed pipes for wetness or corrosion
- Inspect around toilets and the base of the bowl
- Look at the water heater and its connections
Watch Your Water Meter
Your water meter can reveal a hidden leak without any visible signs. Turn off all water-using appliances and make sure no one uses water for about an hour. Then check the meter reading. If the dial moves or the low-flow indicator spins, water is passing through the system, which means you have a leak somewhere.
This method works well for leaks in supply lines that run under concrete or inside walls. If the meter shows movement, you can narrow the search by shutting off individual shutoff valves for fixtures or appliances one at a time. When the meter stops moving after you close a specific valve, you have found the leaking zone.
Listen for Dripping or Running Water
Quiet your home by turning off televisions, fans, and other background noise. Then stand still in each room and listen for a faint drip, hiss, or steady water flow. Pipes inside walls can carry sound, so a leak in one room might be audible in the next. A persistent sound when all fixtures are off points to an active leak.
If you hear water running but cannot find the source, check outdoor spigots and irrigation lines as well. A broken sprinkler head or a leaking hose bib can waste a lot of water and damage the foundation over time. For leaks behind drywall or under the subfloor, you may need professional help to locate the exact spot.
Check Appliance Connections
Dishwashers, washing machines, and refrigerators with ice makers are common leak sources. Pull these appliances out carefully and inspect the supply lines and drain hoses for cracks, loose fittings, or bulges. Look for water puddles, rust, or a musty smell underneath, which indicates a slow leak that has been going on for a while.
Also check the rubber gaskets around appliance doors and the seals on refrigerator water filters. A worn gasket can let water escape during cycles. If you find a damaged line, turn off the appliance's water supply valve and replace the part or call a plumber. For cleanup after an appliance leak, the pros can dry the area and prevent mold.
When to Call the Pros
If you cannot find the leak or if water has soaked into walls, floors, or insulation, it is time to bring in the pros. They have moisture meters and thermal cameras that can detect hidden water without tearing open your home. They can also dry out structural materials to prevent rot and mold growth.
Act quickly if you see standing water, sagging drywall, or a musty smell, because mold can start growing within a day or two. For a suspected pipe leak in a slab or under the house, professional leak detection is often worth the cost. The pros can pinpoint the leak and help you plan the repair.
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Call Now (214) 730-5993Frequently asked questions
How often should I check for leaks?
Check visible areas like under sinks and around toilets once a month. Do a full check, including the water meter and appliance connections, every three to six months. More frequent checks are wise if you have older pipes or have had a leak before.
What should I do if I find a leak?
First, turn off the water at the main shutoff valve to stop the flow. Then clean up any standing water and dry the area as much as possible. Call the pros to assess the damage and dry out walls or floors, especially if the leak has been going on for a while.
Can I detect a leak behind a wall without cutting it open?
Sometimes. Look for water stains, bubbling paint, or a musty odor. You can also listen for dripping sounds. But for a precise location, you may need professional equipment like moisture meters or acoustic sensors. The pros can find the leak with minimal damage to your walls.