September 26, 1908: First day of operation of the chlorination facility at Boonton Reservoir for Jersey City, NJ. This was the first continuous use of chlorine in the U.S. for drinking water disinfection. Dr. John L. Leal was responsible for this breakthrough in public health. A more complete description of his contribution is covered in my blog safedrinkingwaterdotcom.September 26, 1855: The St. James Board of Commissioners of Paving voted 10 to 2 to reopen the Broad Street pump at the urging of local residents. Dr. John Snow had prevailed upon them a year earlier to remove the pump handle after he presented his evidence that cholera deaths were geographically clustered around the well site.
Reference: Vinten-Johansen, Peter, Howard Brody, Nigel Paneth, Stephen Rachman and Michael Rip. Cholera, Chloroform, and the Science of Medicine. New York:Oxford University, 2003, 310.