San Francisco is often said to have some of the best drinking water in the nation. Fed by snow on the peaks at Yosemite, the cold, unspoiled supplies are so crisp and clean that the water requires no filtration before being piped 160 miles to Bay Area taps. Celebrity water sommelier Martin Riese once called the city’s water “smooth” with earthy notes and “almost like you have little lime” in the aftertaste. This beloved elixir, however, may not be as good as some people think it is. A recent taste test found that the city’s supplies were slightly inferior to water from other Bay Area providers. To be clear, the test conducted by researchers at the University of Colorado at Boulder, with Bay Area residents doing the tasting, is not the final word on San Francisco water.