Xiaomi/Aqara devices are not standard Zigbee. However, they will work with Hubitat as long as you have repeaters in your network that are compatible with Aqara.
I purchased a couple of Aqara sensors, but could not get them to work because I had some older HA1.2 Smartthings and Centralite smart plugs in my setup. I removed those devices and added some eWelink Zigbee 3.0 based smart plugs and the the Aqara devices now work fine. However, I lost the power monitoring capability of the older smart plugs. I have not been able to find a suitable Zigbee smart plug with power monitoring that will work with Aqara sensors.
I have found Ecolink Z-wave Plus water leak sensors to be reliable. I use one as a high water level shutoff sensor for my RO water system. If the sensor fails, the water could overflow the tank. However, the list price is $50 CAD, so I only use a couple of them for my more critical applications. I also have one on my basement sump to indicate if my sump pump fails.
I use Centralite water leak sensors (Zigbee 1.2) under sinks, toilets, etc. However, they are currently out of stock on Amazon.ca.