Geochemical Characteristics of Alluvial Aquifer in the Varaždin Region

The variation in the major groundwater chemistry can be controlled by dissolution and precipitation of minerals, oxidation-reduction reactions, sorption exchange transformation organic matter, but it also occur as a result anthropogenic influence. alluvial aquifer represents main source potable water for public supply town Varaždin surrounding settlements. Sampling campaigns were carried out from June 2017 until 2019 to collect samples nine observation wells. Major cations anions, dissolved carbon nutrients analyzed Hydrochemical Laboratory Croatian Geological survey. sampled waters belong CaMg-HCO3 hydrochemical type, except well P-4039 that belongs NaCa-HCO3 type. It was identified is mainly hydrogeological environment (natural mechanism), influence not negligible. results this research have significant implications on sustainable coexistence between agricultural production supply.