Tri Zones Training

USA Triathlon is the sanctioning authority for more than 2,000 diverse events ranging from grass-roots to high profile races nationwide. The organization works to create interest and participation in a variety of programs including camps, clinics, races and educational opportunities.  Tri Zones Training and most local races require their participants to be a member of USAT.  The USAT web site offers tons of information about the sport of triathlon.
http://www.usatriathlon.org/