This section of the Water Quality Data Book (Central Somalia) consists of the basic hydro-geochemical data used in the evaluation of the water quality in Central Somalia. It Contains existing information compiled from 28 sources and new data collected in 1985-86, Totaling 1,001 sets of data (data records). A computer data Base was established to process this large volume of information, which is stored on magnetic diskettes .A variety of computer programs were used to present the data in a uniform and meaningful manner, appropriate for easy consultation.