5 Signs You Have a Hidden Water Leak

A hidden leak rarely announces itself. There's no dramatic burst, no puddle on the floor — just a slow drip behind drywall or under a slab that quietly runs up your water bill and undermines your foundation for months before anyone notices. By the time it's obvious, the repair is rarely just the pipe.

After decades on North Dallas homes, these are the five signs we tell every homeowner to watch for. Catch them early and a hidden leak is a small fix. Ignore them and it becomes a renovation.

The 5 warning signs

1. Your water bill crept up for no reason. If usage didn't change but the bill did, water is going somewhere you can't see.
2. You hear water when everything's off. Turn off every fixture and listen. A faint hiss or trickle in the walls means a line is still flowing.
3. Warm or damp spots on floors and walls. A warm patch on the floor can mean a hot-water line leaking under the slab; soft drywall means moisture behind it.
4. A musty smell that won't go away. Persistent mildew odor, especially in a cabinet or closet, often traces back to a slow hidden leak.
5. The meter moves with the water off. Shut everything off and watch the meter dial. If it's still moving, you have a leak between the meter and the house.

What to do if you spot one

Don't start opening walls. The goal is to locate the source before anyone cuts into anything. We use electronic and acoustic equipment plus non-invasive diagnostics to pinpoint where the water is actually coming from, so the repair is targeted instead of exploratory.

What you'll want on hand

• A flashlight to check under sinks and in the garage
• Your water-meter location, usually near the street
• A phone to snap a photo of anything that looks off

Watch how we find it

Frequently asked questions