How to determine if I have a slab leak or not?

[Bryce Y.]

What are some good ways to test if I have a leak in the slab? I have a property under contract, and there is some cracking/heaving in the kitchen tiles. See picture below:

[img]http://imgur.com/onlolXF[/img]

When you knock on it, it makes a hollow sound on the tiles that are cracked. I brought in 2 contractors to look at it and they both said it’s just the tiles which need to be replaced. They were confident it wasn’t a slab leak.

However, being a newbie, I am still concerned and want to be 100% sure (or as close as possible) that it is or isn’t a slab leak. I called a few plumbing companies and they quoted me at least a couple hundred to come out and do a pressure test. I’d rather not pay so much if I don’t have to.

Thanks!