tap water

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The water that emerges from taps in homes, public buildings, etc., and standpipes in low-income countries, where a single standpipe may service many families. Tap water usually comes from a reservoir. It may or may not have been partly purified by filtration and disinfected by chlorination, but it may still contain toxic or other chemicals and some pathogens, e.g., Giardia, cryptosporidium, and sometimes more dangerous pathogens such as Salmonella typhi. When there is doubt, water should be further tested and treated by boiling before it is used for drinking, cleaning vegetables, or cooking.

Subjects: Public Health and Epidemiology.

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