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This paper examines the nitrate concentration in the Aynalem and Mekelle groundwater sources of drinking water for Mekelle city. A total of 15 water samples taken frorn the two well fields showed that significant differences in nitrate concentration. The lowest concentration 6.6 mg"1 and highest concentration 46.8 mg/1 were found in the Aynalem groundwater wells. The highest nitrate concentration among thc 1e wclls of Aynalem was found downstream ofthe well field in an animal feedlot. On the other hand, with exception ofone, Mekelle well located upstream from the main area of the city with a level of 1 1.7 mgl1, the downstream wells contained cencentrations of 54.6, 65.7, 97.5. and 209 mgl], These samples exeeed the maximum nitrate level of50 mgll for drinking water, a guideline set by the World Health Organization (WHO, 1996). Such anthropogenic sources as animal fecdlets and municipal wastes are considered possible seurces for the high cencentration ofnitrates in the Mekelle wells. Further study is needed to identify the sourees ef nitrate pollution in both groundwater well fields concentrating on geology, precipitation, land topology, soil profile, and its health impact on users. Kaywortts: Mleketle; PVlaterqualio'; Nitrate; Potturion; Mlethaemoglobinaemia

Nitrate Concentration in Drinking Groundwater Wells of Mekelle, Ethiopia (I)