Here is another kit that lets you catch any flooding in your home. The Orbit 71003 B-hyve Flood Sensor can detect water after a few drops. It works with iOS and Android device. These sensors can also monitor the temperature and alert you if it goes outside the configured range.
These sensors are battery operated. The kit ships with a B-hyve Gen 2 Wi-Fi hub that connects to the sensors via Bluetooth 5.0.