Lake Tahoe has water purity about the same as distilled water

 

North shore Lake Tahoe, Nevada. The water quality here is renowned for its clarity and purity. It's one of the clearest lakes in the world, with visibility exceeding 70 feet. The lake's high-altitude at 6,230 ft-msl and the surrounding environment contribute to the remarkable water purity, which hovers around 99.7%, or about the same as distilled drinking water.