Why Does My Sump Pump Keep Running After It Rains?

Heavy rain raises the water table around your home, so more water seeps into the sump pit. If the pump runs longer than usual, that is often normal. But if it runs nonstop for hours, something else is likely going on.

A stuck float switch can keep the pump running even when the water level drops. Debris like leaves or small stones can jam the float. Also check the discharge pipe for a blockage, which makes the pump work harder and run longer.

• Float switch stuck in the up position
• Debris in the sump pit jamming the float
• Blocked or kinked discharge line
• Check valve stuck open, allowing backflow
• High water table from prolonged rain
• Undersized pump for the amount of water

The pipe that carries water away from the pump can develop a blockage. Look for a kink, a collapsed section, or an obstruction at the outlet. If the pipe is frozen in winter, that can also stop water from leaving.

Make sure the check valve, if you have one, opens and closes fully. A check valve that sticks open lets water flow back into the pit after the pump shuts off, causing the pump to cycle again. You can test it by listening for water returning.

If you cannot find a simple cause, or if the pump runs for hours after every rain, a water damage pro can inspect the system. They can check the pump size, the float adjustment, and the discharge piping for hidden issues.

A pro can also look for leaks in the sump pit or cracks in the basin that let extra water in. They may recommend a pump with a higher capacity or a different switch type. Local water damage pros can help you decide what repairs are worth doing.