This doesn't make sense at all. High pressure water can be dangerous for sure, but water based energy storage doesn't use high pressure... It's all about pumping the water uphill and then letting the water flow back down through the pump to recover the energy. At worst your house gets flooded because the containment vessel failed.

Worst case with compressed air is a total disintegration of the tank, the room it's in, and the rest of the house along with the occupants.

Water is pressurized. The pressure is a function of gravity and depth, but that is still a lot of pressure.

my english is flawed, I was trying to say that. Water is not pressurized but feel scarier than air for most people, so they go care free around compressed gases.

Water is pressurized. However, it is not compressed. That's an important distinction.

I'm fuzzy and since water is incompressible, "pressure" may not have the same meaning on water than on other substance