The core activity of H.R. Müller AG is the provision of engineering services in the field of civil engineering, particularly in the areas of: water supply (planning, construction and renovation of water supply systems), wastewater disposal (planning, construction and renovation of wastewater systems), road construction (planning, construction and renovation of roads and paths), and development (planning and construction of development infrastructure). The company offers its services from project planning to implementation, for both small and large projects.