The earliest sign is usually your water bill. If your bill increased 15–25% without a change in usage, there’s likely a leak somewhere in your plumbing system. But that’s not the only clue.
8 Warning Signs of a Hidden Leak
1. Unexplained Water Bill Increase
Compare your bill to the same month last year. A 15–25% jump with no change in habits almost always means a leak. Even a slow drip — 10 drips per minute — wastes about 500 gallons per year.
2. Water Meter Test
Turn off every water-using fixture and appliance in the house. Check your water meter. Wait 2 hours without using any water. If the meter moved, you have a leak.
3. Mold or Mildew in Unusual Places
Finding mold on non-shower walls, in closets, or on ceilings below bathrooms usually means moisture is getting into the wall cavity from a leaking pipe. Norfolk’s humidity makes mold growth especially aggressive once moisture is present.
4. Musty Smell
Persistent musty odor in a room — even a clean one — points to hidden moisture feeding mold growth behind walls or under flooring.
5. Stains on Walls or Ceilings
Yellowish or brownish stains, bubbling paint, or peeling wallpaper on walls or ceilings indicate water migrating through drywall from a pipe behind it.
6. Soft or Warped Flooring
Wood floors that buckle, laminate that lifts, or tile that loosens can all indicate a slab leak or a pipe leaking beneath the subfloor.
7. Sound of Running Water
If you hear water running when no fixtures are on, something is leaking. Follow the sound — it may lead you to the general area.
8. Foundation Cracks or Shifting
A slab leak can erode soil under your foundation, causing cracks or uneven settling. This is more common in Norfolk’s clay-heavy soils.
How Professional Leak Detection Works
- Acoustic detection: Amplifies the sound of water escaping from pipes through walls, floors, or underground
- Thermal imaging: Infrared camera detects temperature differences where water is pooling behind walls or under floors
- Pressure testing: Isolates sections of plumbing to narrow down which line is leaking
Cost: $150–$400 for professional leak detection. This saves thousands compared to cutting into random walls looking for the source.
Slab Leak Repair Cost
- Spot repair (one pipe): $500–$2,000
- Reroute (abandon old pipe, run new line): $1,500–$4,000
- Full repipe: $4,000–$10,000
Powell’s Plumbing & Air provides leak detection and repair throughout Norfolk, Virginia Beach, Chesapeake, and Hampton Roads.