The telltale signs of a leaking pipe at home are an unexplained rise in the water bill, a water meter that moves with everything off, stains on walls or ceilings, the sound of running water, a persistent musty smell, and damaged or warped flooring. Any one of these is worth checking; two or more together usually means a hidden leak.
1. Your water bill keeps rising
If your usage has not changed but the bill has, water may be escaping somewhere you cannot see. Compare against the same period last year to account for seasonal watering.
2. The water meter moves with everything off
Turn off every faucet, appliance and irrigation zone and watch the meter. A moving dial or leak indicator confirms water is flowing. See reading your water meter.
3. Stains on walls or ceilings
Yellow or brown stains, whether faint or large, mean water is reaching that surface. Stains that grow over time point to an ongoing leak. Our article on water staining on drywall explains what different stains can mean.
4. The sound of running water
Hearing water moving in walls or under floors when nothing is on is a strong sign of a leak in a pressurized line. Listen at night when the house is quiet.
5. A musty smell
Leaking water creates damp conditions where mold and mildew grow, often inside walls or under flooring. A smell that gets stronger over time, or is concentrated in one room or closet, is worth investigating.
6. Damaged walls, floors and ceilings
- Peeling or bubbling paint and soft drywall
- Warped, cupped or lifting floors and loose tiles
- Warm spots on floors over a slab, which can point to a hot water leak
- Swollen cabinet bases under sinks
7. Lower water pressure
A drop in pressure at several fixtures can mean water is escaping before it reaches them.
What to do if you notice these signs
- Run the meter test to confirm water is being lost.
- Check accessible areas: under sinks, around toilets, behind appliances and at the water heater.
- If water is actively escaping, shut off the main valve.
- If you cannot find the source, have it located before opening walls or floors.
Frequently asked questions
Can a pipe leak without any visible water?
Yes. Leaks under a slab, inside walls or in underground lines often show no water at all. A rising bill or a moving meter may be the only clue.
Is a small leak worth fixing quickly?
Yes. A continuous leak runs day and night, and water damage, mold and higher bills grow the longer it continues.
What should I do first if I see a stain spreading?
Check whether the meter moves with everything off, shut off the water if the leak is active, and have the source located before opening the wall or ceiling.
The signs of a leak guide covers warning signs by area of the home. For leaks you cannot see, mystery leak detection pinpoints the source with non-invasive tools. Call 1st Response Leak Detection at (619) 374-8554.