How to Prevent Water Damage Before It Happens

Last verified September 2026. See our sourcing and methodology.

Most water damage doesn't come from dramatic storms — it comes from ordinary parts of a house failing quietly. These checks catch most of it early.

Know where your main shutoff is

Before anything happens, not during. If you don't already know, find your main water shutoff valve now — it's the single fastest way to limit damage when something fails.

Replace supply lines on a schedule, not when they fail

Rubber supply lines (behind toilets, under sinks, to washing machines) are a common failure point and are cheap to replace proactively — many manufacturers recommend every 5–10 years, sooner for plain rubber than braided stainless.

Test your sump pump before the season it matters

If you have one, test it — pour a bucket of water into the pit and confirm it kicks on — before heavy rain or snowmelt season, and consider a battery backup. Sump pump failure during a power outage is a common cause of basement flooding.

Clean gutters and check grading

Clogged gutters and ground that slopes toward the foundation instead of away from it are two of the most common, and most preventable, causes of basement water intrusion.

Know your appliance hose ages

Washing machine and dishwasher supply hoses fail more often than people expect; braided stainless steel hoses last longer than plain rubber ones and are a low-cost swap.