8 Best Water Leak Detectors (2025), Tested and Reviewed
First Alert L1 Wi-Fi Water Leak and Freeze Detector Photograph: Simon Hill Other Leak Detectors We Like First Alert L1 Wi-Fi Water Leak and Freeze Detector for $62: This large flood sensor, branded First Alert, works with First Alert or Resideo apps and accessories. It sends push notifications and emails to alert you to any leak and sports a 100-decibel alarm that you can stop with the side button. The sensor was relatively slow to alert in all my tests, and the push notifications only came through when my phone was connected to Wi-Fi. The 5-foot water sensing cable allows you to cover a much larger area, and I found it alerted faster. The detector connects directly to Wi-Fi, so you need a decent signal. This sensor can also track temperature and humidity, but not very accurately (it consistently overestimated temperature and underestimated humidity). The two AA batteries provided are supposed to last up to two years. SwitchBot Water Leak Detector for $18: This rectangular detector triggered swift alerts in all my tests with a …