Meet the mydlink WiFi Water Sensor (DCH-S160): a smart device that detects water and alerts you on your mobile device before it is too late. It also sounds an audible alarm when a water leak is detected. To get started, simply place the water sensor anywhere you like, connect it to your existing home network, and use the companion app to monitor what’s happening.
This water sensor works with your existing devices to make your home smarter. In fact, you can create rules for interaction with smart plugs and sirens. Sets you back under $75.