Christina -
All 26 National Panhellenic Conference sororities are by definition "dry" - they do not allow alcohol at sorority sponsored functions and alcohol is not allowed in sorority sponsored housing.
For a list of these groups and links to their home pages, see:
http://www.greeklife.org/npc/members.htm
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Fraternally,
Barbara
Zeta Tau Alpha Alumna
If you have to go around telling everyone you're in charge you're not much of a leader.