Not every leak announces itself with a puddle on the floor. Some of the most damaging leaks happen quietly — behind a wall, under a slab foundation, or underground between the meter and the house. Here's what tends to give them away.
Your Water Bill Jumps for No Clear Reason
If your usage habits haven't changed but your bill has gone up noticeably, that's often one of the first signs something is leaking somewhere in the system.
You Hear Running Water With Everything Off
If every faucet and appliance is off but you can still hear water running somewhere in the house, that's worth investigating.
Warm or Damp Spots on the Floor
In homes with a slab foundation, a warm or damp patch on an otherwise normal floor can indicate a hot water line leaking beneath the slab.
Unexplained Mold or a Musty Smell
Mold needs moisture to grow. If you're noticing a musty smell or mold in one particular area with no obvious water source, a hidden leak nearby is a reasonable thing to suspect.
Your Water Meter Keeps Moving
With everything in the house turned off, check your water meter. If it's still moving, water is flowing somewhere — even if you can't see or hear it.
Common Places Hidden Leaks Occur
- Slab leaks — beneath a concrete foundation, common in many Richardson homes
- Underground leaks — in the water line between the meter and the house
- Behind-the-wall leaks — supply line leaks inside a wall cavity, often first noticed by staining
Why It's Worth Addressing Early
A small hidden leak rarely stays small. The longer it goes unaddressed, the more likely it is to affect flooring, drywall, or even your foundation. Locating the source before opening up walls or slab also helps limit unnecessary damage during the repair. Read more on our leak detection and repair page.