Most of McLean gets Fairfax Water, much of it treated by the Washington Aqueduct, and a big share of the homes in its two ZIPs are apartments and condos around Tysons. So it surprises people that the Health Department still lists 758 active well records in 22102 and 275 in 22101. They aren’t spread around. In 22102 they crowd the Great Falls side: Old Dominion Drive has the most, then Towlston Road, Georgetown Pike and Bellview Road. In 22101 it’s Turkey Run Road and Dulany Drive.
Those lots can hide deep wells. In September 2026 we were called to a McLean house that had been out of water for about two weeks. The well was 600 feet deep and ran on a control box with no pressure switch, and the box was flashing a fault code. A pump that far down means 600 feet of wire and drop pipe coming up and going back, which is why a deep well prices on its own row, $9,500 to $16,500, and why we test everything we can from the house before anyone starts pulling.
The well isn’t only the pump, either. In August 2026 a McLean owner had us repipe the horizontal water lines in the basement and crawl space, from the well pump out to the risers that feed the fixtures, in type L copper. On a well house that run from the tank is where every faucet’s water starts, so when it’s tired, the whole house feels it, and it’s worth a look whenever the pump or tank is being worked on.
McLean’s well permits are newer than you’d guess, too. About a quarter of the active records in 22102 were issued in 2000 or later, a bigger share than in Clifton or Fairfax Station. On lots this size that can mean a replacement well, a deeper one, or a second well for irrigation. Knowing when yours went in and how deep it goes is half the diagnosis, so dig out the paperwork if the house came with any.