Abstract: The aim of this theises was to develop an application for the chemical analysis of water for human consumption and irrigation. The application was made in the PHP programming language. The purpose of the application is to improve the processing of laboratory data, to better assess the quality of groundwater and surface water and to classify precisely irrigation water in terms of its physical, chemical and biological characteristics. The data entered was analyzed according to the MCLs and the physicochemical parameters, important for the classification of irrigation water, were obtained by entering major anions and cations in the application. The application calculates the values of electrical conductivity (EC), total hardness (TH), non-carbonate hardness (NCH), total dissolved solids (TDS), percent sodium (Na%), sodium adsorption ratio (SAR), residual sodium carbonate (RSC), permeability index (PI) and total salts concentration (TSC). In addition to the abovementioned parameters, the application has the ability to check for potential encrustation and corrosion problems as a result of analyzed water usage. The application’s functionality was presented by the analysis of crude water from the water well Bikan in Virovitica.