The core activity of Gujer AG includes engineering services and services in the field of construction and infrastructure, particularly: * Civil engineering and infrastructure (deep and road construction, sewer and pipeline construction, hydraulic engineering, concrete renovation) * Wastewater treatment and purification * Drinking water supply (drinking water intake plants, reservoir construction, general planning) * Asset management and financial and investment planning * Construction and legal services (building police, QS, fire protection, private control, BUS, neighborhood and design planning) * Surveying and geoinformation * Settlement drainage and general drainage planning. The company thus offers comprehensive services for the planning, implementation and maintenance of infrastructure projects, particularly in the field of water and wastewater.