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The drinking water demand of most Estonian communities is covered by groundwater abstracted from the sedimentary rocks. Due to the climate and small population, EstoniaпїЅs fresh water resources are sufficient. However, Estonia faces a number of problems with natural groundwater quality in some areas. Fluoride concentrations up to 7 mg/l are recorded in western Estonia and deeper portion of the Silurian-Ordovician aquifer system, which consists of diverse limestone and dolomite. Fluorine contents in carbonate rock...