Why Does Water Come up Through My Basement Floor Drain?

When a city's combined sewer system gets overwhelmed by heavy rain, it can cause water to back up into your home through the lowest opening, which is often the floor drain. This is a common issue in older infrastructure areas. The drain acts as a relief point for the pressurized system. You cannot stop this backflow without installing a special backwater valve on your property. These valves are designed to allow flow out but prevent reverse flow into your home, and a qualified plumber can install one.

If you have a sump pump tied into your floor drain system, a pump failure can cause water to rise from the drain. The drain may connect to a sump pit designed to collect groundwater. When the pump stops working, that pit fills and water overflows back into the basement through the drain. Regular pump maintenance and testing are crucial to prevent this issue. A failed pump can leave your basement vulnerable during a storm.

• The sump pump has lost power
• The pump is clogged with debris
• The float switch that activates it is stuck
• The discharge pipe outside is frozen or blocked
• The pump is old and has mechanically failed
• The check valve on the discharge line is broken

First, stop using any water in your home to prevent adding to the backup. Do not try to use chemical drain cleaners, as they can splash back and cause injury. If the water is contaminated with sewage, keep everyone out of the area. Then, call a plumber to diagnose the cause. For cleanup, you will need qualified water damage pros to handle the water extraction and drying process. They will also help ensure the area is properly sanitized to prevent mold and other health hazards.