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Lake Kashkadan is one of the aesthetic and recreational sites of the city of Ufa. An assessment of the ecological and hygienic condition of the reservoir was made and a system of biotechnological and bioengineering measures to optimize the conditions of recreation was developed. It was revealed that according to physicochemical and sanitarybacteriological indicators, the water in the lake corresponds to the standards for recreational water bodies. An unfavorable situation is observed in the parasitological indicators of water (viable lamblia cysts, eggs of ascaris, toxocara, fasciola and opisthorchis were found). The algological studies revealed 26 species of alga and cyanoprokaryotes of 4 clades (Bacillariophyta, Chlorophyta, Cyanophyta and Dinophyta). Moreover, these indicator-species of organic contamination account for 53.84% of the total taxonomic list. The largest number of alga and cyanobacteria belongs to β-mesosaprobionts. The saprobity index is 1.94, which corresponds to the β-meso-sparobic zone – the water is ―slightly (moderately) contaminated‖. Among the highest aquatic plants, the dominant feature is Potamogeton lucens L., which occupies about three quarters of the lake’s surface and forms a large biomass. The dominant elements in the coastal zone are Typha latifolia L. and Typha angustifolia L. Generally, the state of the ecosystem of Lake Kashkadan is characterized as relatively favorable. To maintain and improve the ecological and hygienic condition of the reservoir, two options for biotechnical measures can be considered: biotechnical measures with preservation of the lake bed and deepening of the lake bottom sections of 5-6 meters with the adoption of additional bioengineering and technical solutions. Preservation of the zone of aquatic plants thickets, arrangement of bathing area, construction of dog walking sites, maintenance of an adequate sanitary condition in the residential zone adjacent to the lake remains relevant for both options. Keywords—recreational water area, sanitary and epidemiological safety, eutrophication, phytoplankton, bioindication.

Ecological and Hygienic Assessment of the State of the Recreational Lake in the City of Ufa