This study is a planned continuation of the complex analysis of the Borisov pond water, which began on May 26, 2019.The purpose of the spring-summer study was to identify the causes of abnormal mortality of higher aquatic organisms, the main purpose of this study was to test the hypothesis about the normalization of the hydrochemical and hydrobiological state of Borisov pond. In this work, based on the results of research on the algoflora of the Borisov ponds, a diverse algae community was established. The most numerous groups in the pond were: diatoms algae and cyanobacteria. Also, the nature of the composition of organisms-indicators of saprobity has undergone a change, and, as a consequence, a general change in the saprobity of the reservoir. In spring, the saprobity of the Borisov pond can be characterized as transitioning from α to β-mesasaprobic. The saprobity of the pond in the autumn-winter period was characterized as β-oligosaprobic, with a large bias in β-mesasaprobicity.