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Abstract
Drilling of private wells in Greater Beirut has increased sharply in the past few decades, thus inducing a marked rise in seawater infiltration, as the amount of extracted groundwater gradually exceeded the amount of natural recharge water. This phenomenon provoked a number of studies on groundwater in Greater Beirut, including the present one, which involved a survey of 75 private wells based on a questionnaire to obtain information pertaining to these wells. Samples of water from 42 of the wells were collected and examined to determine the quality of the groundwater in the study area, particularly regarding the magnitude of seawater infiltration at the time of the investigation. The results obtained and their interpretation are reported and discussed, including the deteriorating quality of the groundwater and associated problems which call for a continuous monitoring program.