摘要：Groundwater generally have better natural condition than surface water. However, because of lithological diversity, they present variable chemical composition, which can also be modified by contaminant loads. This study aimed to evaluate the hydrochemistry, the natural vulnerability of aquifers to contamination and the potentiometric surface of the Serra Geral Aquifer in the municipality of Ametista do Sul, RS. The data was obtained from the Groundwater Information System. There was selected eleven captures information with electrical conductivity, pH, sodium, potassium, calcium, magnesium, chloride, carbonate, bicarbonate, sulfate, fluoride, total alkalinity, static level profiles geological and geographical coordinates. From the Qualigraf 1.1 program, there were generated Piper diagrams for chemical classification and diagrams Stiff and Schoeller-Berkaloff to check the tendency of water. The vulnerability was determined from the GOD system. The pH was between 7.4 and 10.2. As for the chemical classification, ten samples showed up with sodium bicarbonate and sodium as mixed. Five samples showed fluoride concentrations greater than the Maximum Allowed 1.5 mg L-1 established by the Ministry of Health and the natural vulnerability of the aquifer to contamination ranged from insignificant to low.
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