Hydrochemical studies of the Suzdal lakes revealed seasonal and spatial patterns in the formation of water chemistry.The hydrological studies included monthly determinations of water discharge for 2018-2019, followed by the calculation of the main elements of the water balance of the Lower Suzdal Lake, which receives the waters of the Starozhilovka River, the channel from the Middle and Upper Lakes and consumes water through the Kamenka River. The work studies the water-saline balance of the Suzdal lakes located in the northern part of St. Petersburg. The annual external load corresponding to the allochthonous supply of nutrients to the lake: Ptotal = 0.5 g m-2, Ntotal = 28.2 g m-2. Substances were deposited in the lake: P-PO4 up to 107 kg, N-NH4 - up to 3000 kg.