Some hospitals are unable to do them. I had an epidural with both my others so I don't know if I could do it without this time but I am for sure using the tub until that point. It makes contractions more bareable I think and they can still have the monitors and IV hooked up.
I know a lady who had a water birth a few months ago. She liked it and recommended it. My lactation consultant also recommended it, she had her last child in a tub. They both said it was more comfortable than their previous experiences. That said, my doctor won't do a water birth for health and safety reasons. (Can get complicated, put more risk on the baby, make it logistically harder to deliver.) Check out all your options and weigh the risks and benefits.