What's a Sump Pump and Do You Need One?

What it does

A sump pump sits in a small pit (the sump basin) usually located in the lowest part of a basement or crawlspace. As groundwater collects in the pit, the pump activates and moves that water away from the foundation, before it can rise high enough to flood the space.

Do you actually need one?

If your home has a history of basement moisture, is in an area with a high water table, or sits somewhere water naturally collects, a sump pump is a reasonable investment even if you've never had a full flood. Homes on a slope with good natural drainage, or without a basement at all, are less likely to need one.

Maintenance most homeowners skip

• Test it a few times a year by pouring a bucket of water into the pit and confirming the pump activates and drains it
• Clean the intake screen periodically to prevent clogs
• Confirm the discharge line outside isn't blocked, frozen, or draining back toward the foundation
• Check that a battery backup (if you have one) actually holds a charge — sump pumps are most needed during storms, which is exactly when power outages happen

Signs an existing pump is failing

Unusual grinding or rattling noises, a pump that runs constantly even without heavy rain, or visible rust and corrosion on the unit are all reasons to have it inspected before you're relying on it during the next storm.