This paper discusses the results of a comprehensive survey of one of t
he largest drug-user treatment systems in the United States-the system
in Los Angeles County, California, which contains more than 300 progr
ams, covers over 4,000 square miles, and serves clients from a notably
heterogeneous population of almost nine million people. The survey re
ported on here was distinct from similar surveys in that it provided s
imultaneously comprehensive and in-depth descriptions of formal treatm
ent programs in a defined local area. The authors believe that this su
rvey is the first local drug-user treatment program survey of its scop
e and magnitude in the United States.