NDATUS is a voluntary survey designed to be a census of all known drug abuse and alcoholism treatment units in the United States. Survey data encompass the scope, use, and other characteristics of the treatment and prevention units. Units in both public and private sectors are included, regardless of funding sources. From treatment units, NDATUS also collected data on types of care provided, clients and capacity on the point-prevalence data, client demographic characteristics, specialized programs, funding amounts and sources, staffing, waiting lists, IV drug users, HIV testing and HIV-positive clients, and pregnant clients. Following a brief section that describes all reporting units, including both treatment and prevention units, the remainder of the reports presents data only on units that provide treatment services. Topics addressed include numbers of clients in treatment by diagnosis and type of care, capacity and use rates, methadone treatment units and+ client in treatment by unit location and ownership, and number of clients in the 12 months ending with the point-prevalence data. Other information pertains to special treatment populations; financial support for treatment; services by funding source; staffing; and numbers of units, client census, and treatment capacity by State, More comprehensive information will be provided in the Main Findings Report to be published later in the year. 17 tables