In the sense that it finds underground water, water dowsing does not work. Water dowsing involves the claim that a person can locate underground sources of water without using any scientific instruments.

Does water divining actually work?

There is no evidence that divining, which relies on the spontaneous twitching of sticks held in human hands, can accurately detect anything beneath the ground.

What is the science behind dowsing for water?

The natural explanation of "successful" water dowsing is that in many areas underground water is so prevalent close to the land surface that it would be hard to drill a well and not find water. In a region of adequate rainfall and favorable geology, it is difficult not to drill and find water!