Sewer camera inspection in The Plains.

The state register for The Plains Historic District, which takes in most of the town, dates nearly half its buildings from 1900 to 1930, and at least one is a 1920s kit house that probably arrived by rail. A drain from those years was usually cast iron inside the walls and clay or cast iron out under the yard, laid in short lengths, so there’s a joint every few feet for roots and settling to work on.

Almost a quarter of the district went up in the 1940s and 1950s, from the Cape Cods on Loudoun Avenue to four brick houses on Mosby Street around 1956: the years some builders used Orangeburg, a fiber pipe that slumps out of round with age. The Town’s history puts public sewer in place by 1977, so most of these lines were turned toward a public main long after they were laid. The camera shows where old pipe meets new.

The register calls the town fairly flat, apart from a hilly stretch in the northeast, and describes yards full of mature trees. On flat ground a sewer line has little slope to spare, so a section that sinks even an inch can hold standing water and paper. The roots of a big tree find that wet joint first.

Then there’s the wind. NOAA’s Storm Events Database records numerous trees blown down in The Plains on July 12, 2022, Bunker Hill Road among them, and more trees and wires down along The Plains Road in August 2023 and again in August 2024. When a mature tree tips over, its root plate lifts out of the ground and can drag a pipe it has wrapped along with it. If one fell between the house and the street, have the line looked at before the stump is ground out.