Slab Leak Repair in Smithfield, NC

How old is the pipe under a typical Smithfield house?

Often old. Smithfield's median home was built in 1973, and about 65.5% of homes predate 1980, according to Census survey data. Pipe under concrete in houses that age is usually copper or galvanized steel, and both can wear thin after decades. Many older homes near downtown, like most older houses in eastern North Carolina, are built over crawl spaces, where pipe can be reached from below. A true slab leak is more likely in a ranch house on grade, a slab addition or a garage that was turned into a room.

What does the town handle, and what's on me?

The Town of Smithfield treats its own Neuse River water at its plant on North 2nd Street, using chloramine disinfection (2.82 ppm running average in 2025). A separate Smithfield South district gets water from Johnston County Utilities. The town's report doesn't spell out where its responsibility for a service line ends, but pipe under your house is private. If the leak seems to be at the meter or in the yard, call the town before hiring for that section. The town did receive a reporting violation for sending lead service line notices late in 2025; the report explains it.

Should I fix just the leak, or replace the line?

That's the main decision in older homes. A spot repair through the slab is fine when the pipe around the leak is in good shape. If the plumber sees thinning, corrosion or a history of leaks, rerouting the line through walls, the attic or a crawl space usually costs less than a series of repairs. The plumber can show you the condition of the failed section to help you decide.

Also think about what's above the leak. If it sits under a tiled kitchen, a tub or built-in cabinets, opening the floor means removing and replacing those finishes, which can cost more than the plumbing itself. In that case, abandoning the buried pipe is often the cleaner job even when the pipe is in decent shape.

Smithfield permit note

Johnston County Building Inspections handles building permit inspections for the Town of Smithfield under contract, after the town's planning department issues a zoning permit. The plumber can tell you whether your repair needs one.