Water Shut off Valve

Normally a plumber will install a water shut off valve and your security company can monitor it and with many systems that will continue to be the case. Water Cop is one brand and there are others that can be installed by plumbers.

Qolsys has a new shut off valve that works without needing a plumber to install it.

When flooding is detected this valve can shut your main water valve off.

https://qolsys.com/iq-water-valve/