Where does this come from, and can I check it?

Mapping deaths around Broad Street in 1854 pointed to contaminated water. The figure is taken from Wellcome Collection, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

Is this really a history fact?

Yes. It sits on the History shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

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The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.

Mondo Knows Facts

John Snow traced cholera to a single water pump

Mapping deaths around Broad Street in 1854 pointed to contaminated water During a cholera outbreak in Soho in 1854, the physician John Snow plotted deaths on a street map and found them clustered around the Broad Street pump. He persuaded local officials to remove the handle, and the outbreak faded. Later work confirmed that the well had been contaminated by a nearby cesspit. It sits in Mondo's history collection, one of 200 facts that each trace back to the reference below.

Where this comes from

Wellcome Collection

Facts that can change over time are reviewed and updated. If something here looks wrong, Mondo would rather know than be confidently incorrect.

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Tags: cholera, epidemiology, london

John Snow traced cholera to a single water pump: the short answers

Where does this come from, and can I check it?: Mapping deaths around Broad Street in 1854 pointed to contaminated water. The figure is taken from Wellcome Collection, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a history fact?: Yes. It sits on the History shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.