Delivering safe and reliable drinking water is not just amatter of providing services; it also involves protecting the water resources on which water supply systems rely. Sometimes the most effective - andcost-effective - way to insure reliable supplies is to focus on protection and restoration of watersheds. For example, by protecting the Catskill/Delaware and Croton watersheds, covering nearly 5,200 square kilometers, the New York City water supply system was able to deliver safe water to its millions of residents by minimizing its filtration costs (it now filters only 10% of its water supply). Now, one of the world's largest and most influential conservation organizations, the Nature Conservancy, is promoting watershed protection as a means of securing water supplies all over the world, including in low- and middle-income countries, through its Resilient Watersheds Strategy and Water Funds. In this episode of the REAL-Water podcast, we are joined by the Nature Conservancy's Brooke Atwell to learn about how nature-based solutions are restoring freshwater yields, improving livelihoods, sequestering carbon and protecting ecosystems. More information on TNC's efforts to support nature-based solutions can be found at its Nature for Water Facility Website. We also invite listeners to hear more about the Cape Town, South Africa Water Fund as featured on the Unsung Science podcast with David Pogue.