The Blue Lagoon holds nine million liters of geothermal seawater which is naturally renewed every 40 hours. Regular sampling of this natural resource—which is rich in salt, silica, and other minerals—shows that foreign bacteria do not thrive in the lagoon's ecosystem. Thus, disinfectants such as chlorine are not needed. In essence, the lagoon is a self-cleaning ecosystem.
For the past 10 years, Blue Lagoon has been awarded the Blue Flag—one of the world’s most recognized voluntary eco-labels awarded to beaches, marinas, and sustainable boating tourism operators. In order to qualify for the Blue Flag, a series of stringent environmental, educational, safety, and accessibility criteria must be met and maintained.