I know an *amazing* colon hydrotherapist named Denise Miller who owns Willow's Waterworks. I don't have her number on hand, but you can look her up, I am sure she is listed. She may be able to refer you to a naturopath, as she may even have one on staff, but I am not positive.
I met her a couple of years ago when I was living in Tucson for a while, and I had a few sessions with her. She was phenomenal and really one in a million (I've seen so many hydrotherapists in the past so I could compare easily!). I still keep in touch with her by e-mail.