Delaware's sewers aren't like the rest of central Ohio's.

Delaware is the county seat, the oldest housing stock we work in regularly, and the place where a plumber who has only worked new subdivisions shows up with the wrong equipment.

The specific reason is the sewer lateral. Delaware commonly uses 5-inch vitrified clay laterals, where most of central Ohio standardized on 4-inch or 6-inch. That sounds like trivia until somebody arrives with a cutter head sized for the standard and either cannot get it through or cannot get it to cut cleanly, or until a coupling ordered off the usual shelf will not seat on the pipe. It is exactly the kind of local knowledge that separates a plumber who works here from a franchise dispatching from thirty miles away, and it is the reason we ask what part of town you are in before we load the truck.

Everything else about Delaware compounds it. The older sections still carry original clay and cast-iron sewer pipe, cracked, offset and root-infiltrated after a century under a mature street canopy. The soil is clay-heavy glacial till that moves through wet and dry seasons and through freeze and thaw, which stresses buried laterals and water services from the outside while roots work on them from the inside. The Downtown Historic District and the Victorian housing around Ohio Wesleyan add pre-1900 building methods, galvanized supply, and real limits on what can change where anyone can see it. And the city runs its own utilities - a water plant on the Olentangy treating in the region of 3.65 million gallons a day across roughly 190 miles of water main, and a sewer system of about 175 miles of line, 3,250 manholes and a dozen pump stations - so the answers about who maintains what are Delaware's answers, not Columbus's or Del-Co's.