Spring is when most north metro basements get tested. Snowpack melts, the ground is still frozen near the surface, and groundwater rises. A little preparation in late winter goes a long way.
Inside
- Test the sump pump. Pour a bucket of water into the basin and make sure it switches on and off cleanly.
- Test the backup. Unplug the main pump briefly and confirm the backup takes over, then plug it back in.
- Check the check valve. Water shouldn't rush back into the basin after the pump stops.
- Clear the basin. Remove gravel or debris that could jam the float or impeller.
- Look at the walls. Note any new cracks or damp spots so you can watch them.
- Raise stored items. Get boxes and electronics off the floor near outside walls.
Outside
- Clear the discharge line outlet. Ice and snow can block it; a frozen line backs water up into the basin.
- Move snow away from the house. Shovel a few feet back from foundation walls, especially near window wells.
- Extend downspouts. Reattach any extensions removed for snow plowing.
- Watch low spots. Note where meltwater pools next to the house; that's where to regrade later.
If your pump is old or you have no backup, call before the thaw rather than during it. Contractors are busiest once water is already coming in.