While the water in Loch Ness is technically fresh and remarkably clean due to its massive volume and lack of industrial pollution, it is not recommended to drink directly from the loch without filtration or treatment. The water has a very distinctive dark, tea-like color caused by a high concentration of peat that washes in from the surrounding Highland hills. While peat is not toxic, it makes the water cloudy and provides a habitat for various microscopic organisms and bacteria that can cause stomach upset in humans. Additionally, like any large body of open water, Loch Ness is susceptible to environmental contaminants such as agricultural runoff or waste from the numerous boats that traverse the Caledonian Canal. However, the water is used commercially; a premium brand called "Loch Ness Water" is professionally filtered, UV-treated, and bottled for sale. If you are visiting and want to "taste the legend," it is far safer to buy a bottle of this purified version than to scoop a cup directly from the shoreline.