Changes in the Quality and Rating of Surface Waters to Our Days on a Selected Section of River Tisza

The purpose of this study is to present the changes of the water quality of River Tisza over the past decades and the results of the efforts made in order to improve the unfavorable conditions. In order to compare the different water quality examination methods and results, I will overview the previous and present rating methodologies, and will also discuss the deficiencies of rating and their potential impact on safety.