Often the people working at your local health food store can refer you to a colon therapist. Also, practitioners of other forms of natural alternative heath care can sometimes refer you to someone in your area. Also, it doesn't hurt to try calling the offices of naturopaths or chiropractors who advertise "holisitc" care. In many cases, even if the doctor doesn't directly refer clients, the nurse or receptionist in the office will know of someone nearby practicing colon hydrotherapy.