Annandale has some of the oldest housing in Fairfax County, so hidden leaks here often trace back to original supply pipe, aging valves and joints in finished basements. A plumber can confirm the leak at the meter and narrow it down before opening walls. Call the number on this page to be connected with a local plumber in Annandale.
Why Annandale leaks behave the way they do
Annandale grew fast after World War II, and the median home was built in 1968. Neighborhoods like Ravensworth and the streets around Lake Barcroft are full of split-levels and ramblers that may still have original copper or even galvanized lines, sometimes spliced to newer pipe during remodels. Those transitions, along with old gate valves and water heater hookups, are where many leaks start.
Water comes from Fairfax Water. The utility owns and maintains the meter, while the underground line from the meter or street valve to the main shutoff in the house is the homeowner's plumbing. Fairfax Water also notes that inside meters are common in houses built from 1971 to 1980, so some Annandale homes have the meter in the basement rather than at the curb.
Hardness from Fairfax Water's Potomac plant runs about 70 to 185 mg/L, averaging around 7.5 grains per gallon. Over five decades, that scale builds up inside old valves and can keep them from closing fully. A valve that won't shut off is more than an inconvenience during a leak, so the plumber may suggest replacing the main shutoff while on site.
Repair or replace once the leak is found?
| Situation | Spot repair | Replace the section |
|---|---|---|
| One pinhole in otherwise sound copper | Usually enough | Rarely needed |
| Corroded galvanized pipe | A short-term fix | Often the better choice |
| Leaking yard line from the meter | Possible for a single joint | Worth weighing for an old, repeatedly patched line |
| Several leaks within a year | Treats symptoms | Repiping may make more sense |
Signs to look for
- A meter that keeps moving after every fixture is off
- Rust-colored stains around pipe joints or a weeping valve stem
- Low or falling pressure at faucets on one floor
- A basement wall that stays damp near where the water line comes in
Seasonal timing
Older homes with pipes in exterior walls or crawlspaces are most at risk in a hard freeze, and a split may not leak until it thaws. Late winter is a good time to watch the meter and look over exposed pipes. Fairfax Water's seasonal switch to free chlorine, generally April through June, can change the water's smell for a few weeks but isn't a sign of a leak.
Leak Detection questions in Annandale
Are older homes here more likely to have hidden leaks?
Where is the water meter if there isn't one by the street?
Who is responsible for a leak between the meter and the house?
Can a leak under the basement floor be found without breaking up the concrete?
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