Place One Near Your Water Heater This Week.
A water leak detection alarm is a small sensor — roughly the size of a hockey puck — that sits on the floor near a water source and sounds an alert the moment it detects moisture. They cost between $10 and $25 each at any hardware store or online retailer, require no installation, no wiring, and no professional help. You place the sensor on the floor, put a battery in it, and it works immediately. If water reaches it, an alarm sounds.
Where to Place Them for Maximum Protection
Placement recommendations: EPA WaterSense; Insurance Information Institute Water Damage Prevention Guide 2025; IICRC Restoration Best Practices.
What They Cost vs. What They Can Prevent
A set of six alarms covering all the locations above costs roughly $60 to $120 total. The average homeowner insurance claim for water damage is $13,900, according to the Insurance Information Institute's 2025 data. Most water damage claims trace back to slow leaks that went undetected for days or weeks before a visible problem appeared. A $15 sensor that sounds an alarm within minutes of the first moisture is one of the most practical tools available for protecting a home's value.
With care,
Mike Bridges
Founder, The O55 Report