The Philharmonie de Paris is participating in the development of new HEQ (High Environmental Quality) standards for concert halls. The four priority targets are energy, water, maintenance and acoustic comfort. For example, the design of the water supply and drainage systems required thousands of hours of study and work. Energy-efficient pumps ensure economical pumping of drinking water and disposal of waste water. Rainwater recovery is used for watering green areas, maintaining the premises and supplying the public toilets.