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  • Alerts if water is detected on the alarm or included 5-foot sensing cable.
  • Tracks temperature and humidity shifts to alert of potential leaks or freezing pipes.
  • When activated, provides an audible 100dB alert and mobile push notifications.
  • Quick and easy setup, battery operated (up to 2 years) and compatible with the Resideo Smart Home App.
  • Can be used repeatedly, simply dry off the detector and sensing cable.

Help save your home from potential water damage with the First Alert L1 WiFi Water Leak and Freeze Detector smart device. Even when you're away, this alarm will monitor temperatures while warning you of leaks. This compact, smart device sends mobile push and email notifications, alerting you to water leaks, freezing temperatures and humidity out of the set range. The water leak detector is designed to help you avoid potential water damage and costly repairs.

Smart Alerts

The L1 WiFi Leak and Freeze Detector sends you alerts when it detects a water leak via the sensor cable or when temperature or humidity levels are out of the set range. Let First Alert's technology provide you with added peace of mind.


Use the Water Leak Detector as a standalone product or part of a comprehensive water leak control solution by pairing multiple First Alert Water Leak and Freeze Detectors together.

Quick Setup

Simply install the battery-operated smart device near water heaters, sump pumps, washing machines, under sinks or wherever a leak may occur. Setup can then quickly be completed using the Resideo App. No extra hub is required.

Extend and Expand Coverage

The L1 WiFi Water Leak and Freeze Detector includes a 5 ft. cable sensor that detects water along its entire length. Loop and lay the sensor through a basement or utility room.

Track Trends

The L1 WiFi Water Leak and Freeze Detector will keep you aware by monitoring humidity and temperature levels while delivering these performance trends to your mobile app. When water leaks, specific temperatures or high humidity levels are detected, the device sends alerts to your mobile device, sends an email, and activates LED status lights and a 100-decibel alarm. The water leak detector provides essential at-home and remote water leak awareness.


Easily reset your device after it detects a leak. Completely dry the sensor cable, plug it back into the device, and it's ready to use again.

Product Details
first alert water alarm first alert leak alarm first alert water damage and flood alarm
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Overall Rating

1 Reviews
1 customers recommend this product
First Alert L1 Wi-Fi Water Leak and Freeze Detector with Cable Reviews
Stewart Morrison
March 5, 2024
Water Alarm

Installed this unit about 30 days ago. Install was easy to connect to the app and to my home wifi. I ran the cable around my water heater and nearby a sump pump as I imagine most people will do. So far it has not gone off so no leaks. To my surprise the unit also shows room temperature and humidity in the app. I did not know it did that prior to installing so that is a bonus. Based on my experience I'd recommend.

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