The urban development in line with a population of mixed socio-economic status and intensive agriculture practice pollutes the water resource in developing countries. Water quality is vital determinant of availability because water that is not fit for use is in effect unavailable. It is clear, that decision-makers require scientifically sound information with which to base their priorities. So, the aim this work is to assess the present status of the groundwater quality on the basis of seasonal variation in Hawella Tulla sub-city, Hawassa. Groundwater samples were collected during the wet and dry seasons of August 2014 and February 2015 from boreholes (n=7). Fluoride, pH, alkalinity, total dissolved solids, nitrate, phosphate, chloride and chromium were assessed. Moreover, metal concentrations (Fe, Cr, Mn) were also determined using atomic absorption spectrophotometer. Fluoride, chloride, sulphate, nitrate and phosphate were measured by colorimeter apparatus using standard solutions. The acquired results imply ground water samples were generally of good quality. The result presents that, virtually all the parameters lies within the maximum permissible limit prescribed by WHO and Ethiopian drinking water standard except, alkalinity, but this value has less impression for the water to use for drinking. Statistical analyses indicate easy going differences among all parameters tested for in the samples at 95% confidence level. However, it is highly essential to examine the quality of potable purpose to grant the health of large community.
Key Words: Hawella Tulla, Physico-chemical, Fluoride, Water quality