Quality control of groundwater in the region of Thessaly (Greece)

In this study, the distribution of physical parameters (electric conductivity, pH and total hardness) and major ions (nitrate, nitrite and chloride) of groundwater in the region of Thessaly, Central Greece, is reported. Samples were collected from three representative areas (lowland-urban, semi-mountainous and coastal one) for the period 1994 to 2004. The results reveal that in some sample-sites of the above areas the determined values of total hardness, nitrate and nitrite exceeded the maximum allowable limits. The values differ significantly among the studied areas, too. Results provide an overview of the hydrochemical functioning of a major water supply system for the region of Thessaly.