Town Code is blunt about it. Herndon looks after the waterworks inside a public right-of-way or Town easement, and never anything past the outlet side of the meter. If your meter sits out at the street, the line from there to your house is yours. If it sits back on your lot, outside the right-of-way, the owner has the service line out beyond the right-of-way line too, while the Town keeps just the meter. So the first thing we do on a Herndon water line is find the meter and the right-of-way line.
The Code has one more trick. Where the Town suspects a leak past the right-of-way, it can set its own meter at the edge and bill you the difference between the two. If your bill has been climbing and the Town mentioned a monitoring meter, that is the pipe we are talking about, and a camera can’t help on a pressure line, so we trace it and dig only where the leak is.
Most of the town went up in the 1970s and 80s, a third of it in the 70s, so the water line is more often copper than iron, and the question is the joints and the fittings. The Town’s 2024 inventory found no lead service lines. The sewer side is the split lateral you may have read about: yours out to the right-of-way, the Town’s from there to the main. A line replacement that crosses that line is two repairs, and we sort out which parts are whose before the trench is marked.
Permits come from the Town’s own Building Inspections office, with a separate plumbing permit, inside the town limits. On the county side, in Floris, Franklin Farm, McNair and Dranesville, it is Fairfax County instead: you own the whole lateral to the county main, and a trench under Centreville Road, Dranesville Road or another state road adds a VDOT permit. The townhouse streets and the McNair condo buildings share lines, so check with the association first.