Inside the town limits the Town looks after its water line up to and including the meter, and its sewer main out to the cleanout. Both usually sit at the property line, close to the sidewalk. From there to the foundation, the pipe is yours. So a line replacement in Leesburg is a front-yard job: a trench from the sidewalk strip to the house, not one that starts out in the street. The Town’s own answers about the sewer side don’t read quite the same everywhere, so ask where your part ends and get that in the quote in writing.
The moment the hole reaches that strip beside the sidewalk, the Town wants a right-of-way permit, house service connections included, and Loudoun County issues the plumbing permit in town and out. Ask who pulls both. The answer you want is the plumber, with the permits sitting inside the price, not a to-do on your list.
The dig changes a lot across town. Downtown, houses on the 1758 grid sit close to the sidewalk under old street trees, so even a short run means opening the walk and working around roots, and the shortness doesn’t make it a small job. In the townhouse rows, about three homes in ten in town, ask the association whether your line is yours alone or shared with the unit next door before it reaches the street. A detached house with a long front yard is the straightforward trench, just a longer one.
Lansdowne has the same mail but sits outside the town limits, on Loudoun Water. There the homeowner keeps up the line out to the street, Loudoun Water repairs the stretch under it, and one of its inspectors checks a replacement before the trench is closed. Nearly nine in ten Lansdowne homes went up since 2000, so a replacement there is more often one failed joint or a crushed section than a whole worn-out line, and the camera tells which.