Sump Pump Installation Across the Carolinas

A sump pump removes water that collects below the level of the basement floor. An interior drain around the walls carries water to a pit, called the sump pit, set into the floor at a low point. When the water in the pit rises, a float switch turns the pump on, and the pump pushes the water up through a pipe and out of the house. When the pit is empty, the pump turns off.

Most basements sit below the level where water could drain out on its own, so the pump is what actually moves the water out. It works day and night without anyone switching it on, which is why it is the center of an interior basement waterproofing system.

A complete system has more than the pump. The sump pit is a basin set into the floor that the drain empties into, usually with a lid that keeps debris out. The float switch rises with the water and starts the pump. The discharge line carries water from the pump up and out through the wall, and a check valve in that line keeps pumped water from falling back into the pit.

Outside, the discharge should empty far enough from the foundation that the water does not soak back toward the walls. Each part matters: a stuck float, a clogged line or a discharge that empties next to the house can leave a working pump unable to keep the basement dry.

The two common types differ in where the motor sits. A submersible pump sits inside the pit, under the water, with a sealed motor. It is quieter, and the pit can be covered. A pedestal pump sets its motor on a column above the pit, out of the water, and is easier to reach for service but louder and harder to cover.

Which type fits depends on the size of the pit, how much water it handles and where it sits in the basement. We match the pump to the basement during the inspection.

A pump has to keep up with water at its peak, which is during and after the heaviest rain. In Piedmont clay around Charlotte and Greensboro, saturated soil can send water toward the foundation for days after a storm. Near the coast around Wilmington and Brunswick County, a high water table can feed the pit between storms as well, so the pump may run often.

An undersized pump can fall behind in those conditions, and one that runs constantly wears out sooner. We size the pump for the water we expect it to handle and route the discharge so the water does not return to the foundation.

Common signs include a pump that runs without stopping, one that turns on and off in quick bursts, grinding or rattling noises, visible rust, water standing in the pit that the pump does not clear, and a musty smell in the basement that keeps coming back. A pump that has not run in a long time may also fail to start when it is needed.

Testing a pump is simple: pour water into the pit until the float rises and watch whether the pump starts, empties the pit and stops. If it does not, or if you are not sure how old it is, we can check it during an inspection.

A standard sump pump runs on household power, so an outage stops it, and outages often come with the same storms that bring the most water. A backup pump in the same pit can take over when that happens, running on a battery or on household water pressure.

For a finished basement, or a home that sees water often, a backup is worth discussing during the inspection. We explain how each type works so you can decide what fits your home.

A sump pump carries a 3 year warranty on parts only, and lifetime coverage on parts and labor is available only through enrollment in, and ongoing participation in, our annual maintenance program at the owner's expense ($250 a year).

Coverage begins once the final invoice is paid in full, and it does not cover acts of nature, power outages, GFCI tripping or breaker trips. The full terms are on our sump pump warranty page.