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In August 1854 , many people in London got very sick . They lived in a place called Soho . More than five hundred people died in ten days . He wanted to find the cause of the illness . Snow walked the streets and asked questions . He made a list of the people who died . Most of them drank water from one pump . The pump was on Broad Street . On 7 September , Snow spoke to the local leaders . The next day , workers took the handle off the pump . Nobody could take water from it now . The illness was already slowing , and soon it ended . Later , Snow drew a map of Soho . He put a mark on the map for every death . The marks were close together around the Broad Street pump . Not everyone believed Snow at first . Many people thought bad air made people sick . Snow 's map pointed to dirty water . Today , doctors still use maps to find the cause of an illness . They look for a pattern in the cases . Snow 's map is one of the most famous maps in medical history .
