8 Warning Signs of a Slab Leak
A leak below a concrete slab can remain hidden while water use, flooring conditions, or soil moisture changes. These observations can help determine whether professional leak detection is appropriate.
Sign 1: Unexplained Water Bill Increase
An unexplained increase in metered use can indicate a leak, but irrigation, fixtures, occupancy, and billing periods should also be checked. Compare current use with prior periods and verify that all fixtures are off before testing the meter.
Sign 2: Sound of Running Water
With fixtures and known water-using equipment off, a continuing flow sound can justify checking the meter, fixture valves, appliances, irrigation, and concealed piping. Sound alone does not locate a leak.
Sign 3: Hot Spots on Your Floor
A repeatable warm area can have several causes, including sunlight, ducts, appliances, floor heating, or nearby hot-water piping. Compare conditions safely and report the location, time, and whether the water meter also changes; temperature alone does not prove a slab leak.
Sign 4: Cracks in Walls or Foundation
Cracks or movement can have many structural, material, drainage, and soil causes. Do not assign them to plumbing without leak evidence. Record:
- New cracks near doors and windows
- Doors that suddenly won't close properly
- Cracks in floor tiles or foundation
- Uneven or sloping floors
Sign 5: Mold or Mildew Smell
A musty odor can accompany moisture, but it does not identify the source. Check for visible plumbing leakage, condensation, roof or exterior-water entry, HVAC drainage, and flooring moisture before assuming concealed piping is involved.
Sign 6: Low Water Pressure
Pressure or flow changes can involve one fixture, a valve, a filter, the water heater, supply piping, demand elsewhere, or the utility. Note whether the change affects hot water, cold water, one fixture, or the whole building.
Sign 7: Wet Spots on Floors
Water seeping up through your slab may appear as:
- Damp carpet that won't dry
- Discolored spots on tile grout
- Warping or buckling hardwood
- Moisture under vinyl flooring
Sign 8: Running Water Meter
The simple meter test:
- Turn off all water in your house
- Check your meter (usually at the curb)
- Wait 30 minutes—don't use any water
- Check meter again
Unexpected meter movement can indicate water use or leakage, but irrigation, appliances, treatment equipment, toilets, and other automatic uses must first be excluded. Record the elapsed time and meter readings for diagnosis.
Conditions That Matter During Diagnosis
Foundation type, pipe material, utility routing, prior repairs, observed moisture, and site access all affect how a possible slab leak should be investigated. Do not assume the source from a hot spot, sound, or bill change alone.
What to Do If You Suspect a Slab Leak
- Document the signs (photos, dates, water bills)
- Request leak diagnosis with the exact observations
- Contact your insurance company
- Avoid destructive access or unfamiliar gas, electrical, or pressurized-piping work before the source is narrowed
Professional Leak Detection in Tyler
Hester Plumbing provides leak-detection service in Tyler. The appropriate diagnostic method and any access work depend on the reported symptoms, property construction, and site conditions.
Call (903) 721-4242 with the exact address and observed leak symptoms.