Quick Answer

Hidden leaks often show up as unexplained water bill increases, musty odors, damp drywall, warm spots on floors, or a water meter that moves when everything is off. If you suspect a leak, confirm with a quick meter test, then schedule professional leak detection to avoid unnecessary demolition.

Why hidden leaks matter

A small leak can become a major repair because water quietly damages drywall, flooring, cabinets, insulation, and framing. The earlier you confirm the source, the more likely the repair stays clean and contained.

10 common signs of a hidden leak

1. Water bill spikes with no change in usage
2. Sounds of running water when fixtures are off
3. Musty odor or damp smell in a room or cabinet
4. Stains on ceilings or walls or bubbling paint
5. Warped floors or loose tiles and grout cracks
6. Warm area on slab (possible hot water leak under the foundation)
7. Toilet ghost flushing or constant bowl refilling
8. Low pressure in one area of the home
9. Wet soil outdoors or unusually green patches
10. Mold growth where moisture should not exist
    

The 5 minute water meter test

1. Turn off all water use, including irrigation if possible.
2. Check your water meter. Note the reading.
3. Watch the small flow indicator.
4. Wait 10 to 15 minutes without using water.
5. Recheck the meter. If it changed, you likely have a leak.
   

What to do if you suspect a hidden leak

• Shut off water if active damage is visible.
• Take photos and note dates.
• Avoid cutting drywall or flooring until the leak is located.
• Schedule professional leak detection so repairs stay minimal.
  

When it is urgent

Call immediately if you have active water spreading, ceiling sagging, outlets near moisture, a sudden pressure drop, or a warm slab spot.

FAQ

If you are seeing any of these signs, it is worth a professional evaluation. CG Plumbing focuses on precise diagnosis so the repair is clean, predictable, and done right.