In recent years a great deal of attention has been given to developing innovations in therapeutic interventions for drug abuse treatment. At the same time findings from the major drug abuse treatment outcomes studies have shown dramatic declines in basic treatment and support services; factors which are highly predictive of retention and completion of drug abuse treatment. This study examines the relationship between program and client characteristics and the availability of social support services in the Alcohol and Drug Services Study (ADSS). A sample of 391 long-term residential (LTR), 311 outpatient methadone (OMT), and 949 outpatient drug free (OPD) programs were drawn from this nationally representative sample of treatment facilities. The ADSS data included measures of program characteristics such as modality, size, professionalization, ownership/sponsorship, licensing/accreditation, and core services (such as assessment and diagnosis, individual and group counseling, detox, relapse prevention and self-help groups, etc.). The client characteristics examined included measures of diversity of gender, age, mental health status, race, etc. A hierarchical OLS multiple regression analysis was used to examine the relationships between program and client characteristics, the provision of social support services (family counseling, child care, transportation, employment and vocational services, HIV/AIDS testing and counseling, treatment for co-occurring substance abuse and mental health disorders, screening for tuberculosis, prenatal care, mental health treatment, and substance abuse prevention). The findings demonstrate that program characteristics of size, professionalization, revenue diversity, core services and client-level characteristics of percent of females clients, percent of clients who are dually diagnosed, and percent of clients under the age of 24 were the best predictors of the availability of social support services. The implications for social work practice and practice relevant research in the addictions will be discussed.