During 2013 the estimation of the ecological prosperity of nine aquatic ecosystems located in various park areas Chisinau: three lakes Rose Valley (Botanica), three lakes Riscanovca park and three lakes of park «La izvor» (Buiucani). Problems with ecological prosperity in lakes revealed by degradation of the oxygen regime of aquatic ecosystems, the direction of redox processes and the absence of hydrogen peroxide. Measurements were made at different periods of the annual cycle using four methods: classical [1] standard [2], by Clark [3] and the procedure "rules Nernst" [4]. During the winter, the classic and standard methods showed good agreement between the results, indicating mainly in contaminated water quality class. For the studied aquatic ecosystems values of the redox potential ranged from 252 to 453 mv, and the parameter of aerobic aquatic phase rH2 varied in the range from 25.4 to 32.8 depending on the object of study and the time of year. Irreversible ecological disorders in aquatic ecosystems have been identified by us, mainly in the autumn season. Research results make it possible to arrange the cascades of lakes Chisinau with increasing ecological disorders in the next order: lakes of Rose Valley, lakes of Riscanovca park and lakes of park «La izvor».