Meet the DCH-S160 mydlink Wi-Fi Water Sensor: a smart device that lets you catch leaks before they cost you a ton of money. The Wi-Fi Water Sensor has a built-in alarm and LED to let you know when there is a leak. You also get notifications on your smartphone. Users can create rules to interact with smart plugs and sirens.
You can pair with water sensor with a WiFi Siren to avoid missing leaks. The device works with your existing router and is easy to set up. Sets you back under $75 at this time.