A hidden leak is one you can't see directly, behind a wall, under a slab, or below ground between the meter and the house. These are the clues that tend to show up before any visible water damage does.
Your Water Bill Is the First Clue
A bill that's noticeably higher than usual, with no change in how much water you're actually using, is the single most common sign of a hidden leak. Compare a few months side by side if you have access to your utility's usage history. A steady climb points to a slow leak; a sudden spike points to something more active.
Sounds Worth Paying Attention To
Running water when every fixture in the house is off is a strong signal. So is a hissing or faint dripping sound coming from inside a wall, which often means a supply line leak close to the surface. These sounds are easiest to notice at night when the house is quiet.
Visual Clues
- Warm spots on the floor: Usually a hot water line leaking under a slab.
- Damp or discolored drywall: A stain that grows over days or weeks, not one that appeared once and stayed the same size.
- Buckling or warped flooring: Water getting underneath laminate or hardwood over time.
- Mold or a musty smell: Especially in a spot with no obvious water source nearby.
- Cracks in walls or the foundation: Not always a leak on its own, but worth checking alongside other signs, especially given how much Stillwater's clay soil already moves on its own.
The Water Meter Test
This confirms a leak exists before you go looking for where. Shut off every fixture and appliance that uses water, note your meter reading, wait 20 to 30 minutes, and check again. Any movement means water is leaving the system somewhere.
What to Do Once You Suspect One
Once the meter test confirms a leak, the next step is locating it, which usually means acoustic equipment, thermal imaging, or a camera depending on where the leak likely is. Waiting rarely helps: a slow leak today is often a bigger repair in six months, especially if it's contributing to mold growth or foundation moisture in the meantime.