Abstract
The article presents the results of summer dry-season areal surveys of subsoil water chemistry in the drainage basin of the Ivankovo Reservoir in the Volga segment from Tver City to Dubna City over period 1981–2019. The zone of subsoil water pollution by nutrients has shifted from the anthropogenic landscapes of agricultural fields to residential areas: horticultural and cottage settlements. Local zones of subsoil water pollution by nutrients still persist under fertilized fields and large cattle farms. The long-term dynamics of the major diffuse pollution sources and the regime of nutrients in the Ivankovo Reservoir are discussed.
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