Hydrogeochemical characteristics and spatial distribution of groundwater quality in Arusha well fields, Northern Tanzania

• DOI: 10.1007/s13201-018-0760-4
• Publication Date: 2018-07-09T06:40:40Z
• Authors: Nyamboge Chacha; Karoli N. Njau; George V. Lugomela; Alfred N. N. Muzuka
• Keywords: Lithology; Sodium adsorption ratio

Arusha aquifers have been exploited intensively serving as the main source of domestic water supply in city. But quality groundwater is not clearly documented for future planning and management. Hydrogeochemical assessment was carried out to establish its spatial distribution with aid geostatistical techniques. Groundwater samples were collected analyzed major cations anions using conventional methods analysis. Well lithology geological map considered hydrogeological interpretation area. The results piper diagram revealed Na–K–HCO3 type sodium bicarbonate ions dominating all samples. High fluoride concentrations general chemistry are mainly controlled by aquifer than anthropogenic activities. levels pollution indicators such nitrate, chloride sulfate deep wells generally low most likely coming from natural sources. sections indicate two potential (volcanic sediment weathered/fractured formation) both yield containing significant concentration fluoride. Fluoride higher WHO guidelines (1.5 mg/l) Tanzanian standards (4.0 82 36% samples, respectively. southern part study area yields better human consumption northern zones which at high elevation on foot Mt. Meru. With exception fluoride, suitable drinking purpose other socioeconomic uses.