Key facts: Slab Leaks in Bear Creek
- A local guide describes the Bear Creek area as having mature trees and creek lines, with established homes and newer infill.[1]
- A water meter that moves with everything off points to plumbing; rain or ground moisture will not move a meter.
- Whether a plumber or a drainage specialist comes first depends on that test.
Telling them apart
Plumbing leak or ground water?
| Test | Plumbing leak | Ground or surface water |
|---|---|---|
| Meter with everything off | Dial moves | Dial still |
| Weather | Same in dry spells | Worse after storms |
| Temperature of the floor | May be warm if hot line | Cool |
| Location | Often along a pipe route | Often along an outside wall |
| Smell | Usually none at first | Earthy or musty |
| Silt | None | Possible |
Local conditions
Why this area makes the question harder
Natural creek lines and mature trees are what give this part of Cedar Hill its character. They also mean a lot can stay damp for a good while after rain, with low spots in the yard and shade on the walls. A floor against a damp outside wall may read wet with no plumbing failure at all. On the other hand, people in such homes sometimes dismiss a real leak as "just the wet lot", and it runs for weeks.
So don't guess. The meter test takes half an hour, and it's the most useful thing you can do before anyone visits. Do it during a dry spell if you can, and with irrigation off.
The order
Working through it in a Bear Creek home
- 1
Turn off irrigation
Sprinklers near the wall can confuse all the signs.
- 2
Do the meter test
A moving dial means water is going somewhere.
- 3
Close the house valve
This separates the house from the yard line.
- 4
Look at the outside grade
Soil should fall away from the foundation, with downspouts carrying water clear.
- 5
Mark and monitor
Tape the edge of any damp area and check it daily.
- 6
Call the right person
A plumber if the meter moves, and a drainage specialist if it doesn't.
Roots
Tree roots near old slabs
Large trees close to a house can affect it in several ways. Roots can press against shallow lines, and they seek moisture from any small leak in the area. They also draw water from the soil around them, so the ground on one side of the slab may dry out while the other side stays wet. On clay-rich ground this kind of unevenness may matter, though geology changes across town, from chalk on the uplift to clay-rich shale toward the lake.[2][3] A foundation professional can tell you whether anything needs to be done at your house.
Don't remove a mature tree on a hunch. Get an arborist's view and a plumber's view first.
Drains
Drain leaks: the other under-slab problem
Under-slab drains can fail too, and an older house is more likely to have an older drain. Unlike a supply line, a drain doesn't move the meter, since the water only flows when you use a fixture. The clues are a damp area that gets worse after showers or laundry, a sewer smell or slow drains. A plumber can test this with a camera or a pressure test on the drain system.
Water from a drain is contaminated, so the restoration plan changes too. Pad and wet drywall generally come out. See sewage backup cleanup for how that's handled.
- Meter stays still
- Worse after showers
- Camera or drain test
- Treat water as contaminated
Mixed housing
Older home next to new infill
If a new house has been built next door, ask yourself whether anything changed on your side after it went up. Regrading, new fences and new drains can shift surface water, and that can look like a slab problem in a neighboring house. Photograph the yard in the rain and take notes. Those notes will be much more useful than a memory, whether you're talking to your neighbor, the city or a contractor.
On the visit
Questions for whoever comes out
- What test showed you that the leak is in this line?
- Could outside moisture explain any of these readings?
- How will we know the repair has solved it?
- Should the outside grade be checked as well?
- What should be dried, and how long should we watch the readings?
Insurance
Which policy, if any?
How the water arrived may decide how an insurer looks at it. A sudden plumbing failure, a slow leak and ground water are different things to an insurer, and a sample standard form excludes both wear and tear and surface water.[4] Texas policies vary, so ask your agent. Keep your meter notes and dated photographs, because they are the evidence for which of those you actually had.
Read more in slab leak water damage, and see the Bear Creek page for flood map and creek line details.
Confirming it
Testing again after the fix
The real test comes after the repair. Repeat the meter test the same way as before, with the irrigation off, and note the result. Then watch the taped edge of the damp area for a week or so. If it shrinks, you've found the source. If it stays, there may be a second cause, and on a damp lot near a creek line that's quite possible. Readings on the outside wall are often the last to fall, so give them time before you draw any conclusion.
Condensate
Rule out the air handler too
A closet air handler can dampen a nearby floor with no plumbing fault, so check its pan and drain line before you assume the leak is under the slab.
Rain records
Rain gauge
A simple rain gauge gives you a useful record to compare with your damp patch.
Timing
Check after dry weather
Repeat your check after a dry week.
Questions
Bear Creek slab leak questions
How can I tell if my damp floor is a leak or just a wet lot?
Do the meter test with everything off, ideally in a dry spell. If the dial moves, suspect plumbing. If it doesn't, and the damp follows storms or an outside wall, look at grading, drains and downspouts first.
Can tree roots cause a slab leak?
Roots can press on shallow lines and grow toward small leaks, though they aren't always the cause. A plumber can test the lines, and an arborist can comment on the tree. Don't remove a mature tree without those opinions.
Why does the damp only appear after I do laundry?
That points to a drain, not a pressure line, because drains carry water only when you use them. Stop using that fixture and ask a plumber to test the drain. Treat any water from it as contaminated.
Should I call a plumber or a drainage company first?
Let the meter decide. A moving dial with everything off means a plumber. A still dial with damp along an outside wall after rain means a drainage specialist is probably the better first call.
