Here is a smart sensor that you can use to catch water leaks before they become more problematic. The D-Link WiFi Water Leak Sensor & Alarm notifies you via text, alarm, and voice. It has a LED strobe light and built-in 100dB alarm. It combines with Google speakers to give you real-time voice alerts.
The sensor pods use sub-GHz to reach areas where WiFi can’t work. You can wirelessly expand coverage to 16 areas.