The main problem is that the pollution loads (according to BDS7, SM, total nitrogen, general phosphorus) in the waste water treatment plant in the city of Vilnius exceed the average annual nitrogen concentration in the existing design, treatment and discharge of waste water, and the infrastructure of the waste water treatment plant built several decades ago is wearing, therefore, adequate waste water treatment is not ensured in Vilnius city and part of Vilnius district. The aim of the project is to increase the quality of the wastewater management services provided to residents, companies, institutions and guests of Vilnius city and Vilnius district, ensuring that the average annual concentrations of pollutants in the waste water discharges comply with the requirements laid down in the Law on Drinking Water Supply and Wastewater Management and Sub-statutory Legislation and the specific waste water discharge conditions established for the Company, which are contained in the pollution permits issued to the companies.