Bay Curious listeners Alex Kornblum, 8, and his dad, Heath Kornblum, were talking about their drinking water when they landed on this question: How long does it take for water to get from Hetch Hetchy to San Francisco? And how far does it travel?

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Reported by Sarah Craig. Bay Curious is made by Olivia Allen-Price, Katrina Schwartz and Rob Speight. Additional support from Erika Aguilar, Jessica Placzek, Kyana Moghadam, Paul Lancour, Suzie Racho, Carly Severn, Bianca Hernandez, Ethan Lindsey, Vinnee Tong and Michelle Wiley.