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Drinking Water Facts and Statistics

Published by National Center for Emerging and Zoonotic Infectious Diseases (NCEZID), Division of Foodborne, Waterborne, and Environmental Diseases (DFWED) | U.S. Department of Health & Human Services | Catalog Last Checked: September 28, 2026 at 08:25 PM
Cites CDC's estimate that ~1.1 million people/year get sick from drinking-water germs in the US (~1 in 300), with Legionella the top cause of tap-water outbreaks. Lists top-5 causes of outbreaks (2010-2022) separately for public/community water (Legionella, Campylobacter, Giardia, norovirus, Pseudomonas) and private water (Legionella, norovirus, E. coli, Cryptosporidium, Giardia).

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