A McLean slab leak is a leak in a pipe that runs inside or beneath a concrete floor, which in this area usually means a basement slab, a garage or an addition built on grade. Fairfax Water supplies the water, and the plumbing on the house side is the owner's responsibility. Call the number on this page to be connected with a local plumber in McLean.
McLean homes and hidden pipes
McLean is an affluent inner suburb about 8 miles northwest of downtown Washington, and its median home dates to around 1976. Many houses have been expanded or rebuilt over the years, so it is common to find original pipe from one era connected to newer runs from another. Large finished basements, heated floors, stone tile and built-ins make a leak under concrete harder to reach, which is why the repair method matters as much as the leak itself.
Fairfax Water supplies McLean. Some of its customers get water from its own treatment plants and some through the Washington Aqueduct, and either way the water is disinfected with chloramines for most of the year and is moderately hard. For main breaks or water emergencies on the utility side, Fairfax Water's after-hours line is 703-698-5613. On the drain side, Fairfax County makes the owner responsible for the private sewer lateral from the house to the county main.
Choosing a repair
| Approach | When it fits | Trade-offs |
|---|---|---|
| Spot repair through the slab | A single located leak under bare concrete or an easy-to-replace floor | Concrete cutting, patching and refinishing; other weak points may remain |
| Reroute the line | A leak under stone, radiant heat or millwork, or older copper | Avoids the floor; new pipe runs through walls or ceilings that need patching |
| Partial or whole repipe | Several leaks over time or mismatched pipe from past renovations | Biggest scope, but replaces the aging runs together |
What to watch for
- A meter that keeps moving when the house is idle
- Warm tile or a radiant-floor zone that feels wrong
- Efflorescence or dampness on a basement slab in dry weather
- Water spreading under a garage or sunroom floor
Timing
Do not wait for a second billing cycle. Water under a slab keeps soaking finished materials, and in a large basement the damage can spread well beyond the leak before it shows. Fairfax County Land Development Services requires permits for new, repaired or relocated plumbing fixtures, and a plumber can tell you whether a reroute will need one through PLUS. Winter is when many owners notice, as cold slabs make a warm hot-line leak easier to feel.
Slab Leak Repair questions in McLean
Is rerouting the pipe better than breaking up the concrete?
Why does one spot on my floor feel warm?
Should I call the water utility or a plumber first?
Do older homes here have more slab leak risk?
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