Drain tile is a perforated pipe laid around the foundation that collects groundwater and carries it to the sump pit. The sump pump then pushes that water out of the house, so the two work together to keep water from building up against basement walls and under the floor.
What Drain Tile Is
The name comes from old clay tiles once used for drainage, but today it is usually plastic pipe with small holes or slots. It is buried in gravel either outside the foundation footing or just inside along the basement floor edge. Water seeps into the pipe and flows downhill to the pit.
Interior vs. Exterior Systems
- Exterior drain tile: placed outside the foundation, often when the house is built.
- Interior drain tile: installed inside along the basement perimeter, often added later to fix wet basements.
Both types lead to a sump pit, where the pump takes over.
Signs the System Is Not Working Well
Water along the base of basement walls, damp spots on the floor edge, or a sump pit that stays dry while the basement gets wet can mean the drain tile is clogged, crushed, or disconnected. Silt and roots can block perforated pipe over time.
Keeping It Working
The sump pump must be in good working order, since the drain tile only moves water to the pit. Gutters and downspouts should carry roof water away from the house so the system is not overloaded. Some interior systems have cleanouts that allow the pipe to be flushed.
A plumber can check whether water is flowing into the pit during rain.
If water is reaching the pit but not leaving, having the pump itself tested is the first step. For basements that stay wet even with a working pump, you can ask a plumber to look at the whole drainage setup by calling (833) 603-1840.