Since you live in the United States, there are one of MANY MANY possibilities for the type of water that you may have. I have well water in the eastern panhandle of WV and the water is VERY hard. I have no problem making RO/DI water with it though. My daughter lives out west and she has very soft water - her treatment options would probaby be quite different than mine.
Get the water tested and then make an informed decision !