Well if you are looking for a hospital birth, unless something has changed since CDH put up their new building, water births are out of the question there. They laughed at me 5 years ago when I asked about it.
If you are looking for waterbirth, your best bet is West Suburban with the midwives there. Not many hospitals near in Chicagoland allow waterbirth. I think Mercy in Aurora does, that is another option. Otherwise they are the only 2 I know of that do waterbirth other than the homebirth option.
(The aforementioned midwife practices more medically)