Alcohol and other drug abuse is a major problem for children and families involved with public child welfare. Substance abuse compromises appropriate parenting practices and increases the risk of child maltreatment. A substantial proportion of substantiated child abuse and neglect reports involve parental substance abuse. Once in the system, children of substance-abusing families experience significantly longer stays in foster care and significantly lower rates of reunification. To address these problems, child welfare systems are developing service integration models that incorporate both substance abuse and child welfare services. This study provides an initial examination of the effectiveness of one service integration model that emphasizes the provision of intensive case management to link substance abuse and child welfare services. The authors used an experimental design and focused particular attention on two outcomes: access to substance abuse services and family reunification. The findings indicate that the families assigned to the experimental group used substance abuse services at a significantly higher rate and were more likely to achieve family reunification than were families in the control group.