Abstract
The research was conducted on samples of water in Kielce from two intakes: Białogon and Zagnańsk. The results of selected indicators for these waters were presented, among others, the most important ones influencing its chemical stability i.e. calcium or magnesium. Then, using the PHREEQC program, stability indices were calculated for water in Kielce from the two shots in question. In the next stage, the correctness of the water test method was checked by means of a program through the ionic balance of the water and comparison of pH of the water determined with the value determined by calculation. For the above mentioned activities, tables and calculations were prepared on the basis of which appropriate conclusions were made.