"HYDROSTROY ® – SOFIA" Ltd. is a bulgarian construction company established in 1959 as a division of the State Economic Association "HYDROSTROY" and since 22/12/1992 - its official assignee. During its long business activity the State Economic Association "HYDROSTROY" has been involved in the construction of various important engineering projects, both in Bulgaria and abroad – Syria, Iran, Iraq, Libya, Morocco, Algeria, Germany and USSR. Some of the main sites are: Pumped – Storage hydroelectric power plant “Chaira”, Industrial Water – Supply of Nuclear Power Station "Kozloduy", 27 Treatment Plants for potable and waste water, more than 50 big and 200 small dams, over 250 km hydrotechnical, road and railroad tunnels and other hydrotechnical projects.

"HYDROSTROY ® – SOFIA" Ltd. is certified according to EN ISO 9001:2008, ISO 14001:2004, ISO 18001:2007 and has implemented an integrated management system. It is registered in the Central Register of Professional Builders (Bulgarian Construction Chamber).

The main goal of "HYDROSTROY ® – SOFIA" Ltd. is giving the top priority to its clients, striving to meet their specific requirements, offering the most advanced solutions while continuously improves the quality of performed works, the services and production and with continuously provided healthy and safe labor conditions and environmental protection.