McLean leaks most often surface as a higher Fairfax Water bill, a meter that keeps turning, or a damp spot in a finished lower level. A plumber can confirm whether the loss is inside the house, in the irrigation system or on the line from the street. Call the number on this page to be connected with a local plumber in McLean.
McLean conditions that matter
McLean homes are served by Fairfax Water. Most of its customers get water from its own Potomac and Occoquan plants, and some get Potomac water treated by the Washington Aqueduct. For service questions, Fairfax Water's customer line is 703-698-5800 on weekdays, and after-hours water emergencies go to 703-698-5613.
The median house in McLean was built in 1976, and many sit on landscaped lots off Georgetown Pike, Old Dominion Drive and Chain Bridge Road. That brings two leak sources denser suburbs see less of: long yard runs from the street to the house, and extensive lawn irrigation. Fairfax County's cross-connection rules require a testable backflow assembly on residential irrigation, checked every year by a certified tester on the County's authorized list, and the piping downstream of it belongs to the owner.
Indoors, original 1970s copper, aging shutoff valves and older water heater connections are common culprits. Larger houses with several bathrooms also give a slow leak more places to hide.
Comparing likely leak locations
| Location | Typical clue | Usual approach |
|---|---|---|
| Irrigation zone | Soggy bed, a head that never stops weeping | Zone-by-zone run with the meter watched |
| Yard service line | Meter moves with the house valve shut | Acoustic listening along the line, pressure test |
| Finished lower level | Swollen trim, musty smell | Moisture mapping, thermal camera |
| Upstairs bath | Stain on the ceiling below | Separate supply and drain tests |
Signs worth acting on
- A bill well out of line with the same season last year
- Hissing in the walls after the house goes quiet for the night
- Loose or cracked tile around a tub or shower
- A pool, fountain or hot tub that needs topping off more than usual
Timing through the year
Spring is a good time to check, when the irrigation system starts back up and any freeze damage from winter shows itself. Fairfax Water switches from chloramines to free chlorine generally from April through June, so a change in taste then is expected and unrelated to a leak. Before a long winter trip, shutting the main and draining exterior hose bibbs helps avoid coming home to a burst pipe. Late summer, when sprinklers have run hard for months, is another sensible moment to compare bills against the year before.
Leak Detection questions in McLean
Could the lawn irrigation system be where the water is going?
Who do I call about water coming up near the meter or in the street?
Do I need a permit to repair the leak once it is found?
Are older homes here more likely to have hidden leaks?
More plumbing services in McLean
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