February 23, 1893: Interstate Quarantine Act becomes law. “In 1893 Congress passed the Interstate Quarantine Act to reduce the spread of communicable diseases through interstate commerce. The act gave the Department of the Treasury broad powers to establish regulations preventing the spread of disease from one state to another in the following clause (Cumming 1932; Kraut 1994):
‘The Secretary of the Treasury shall, if in his judgment it is necessary and proper, make such additional rules and regulations as are necessary to prevent the introduction of such diseases (communicable) into the United States from foreign countries, or into one State or Territory or the District of Columbia from another State or Territory or the District of Columbia ….’
This clause was not immediately perceived as requiring any regulations relating to drinking water. In fact, methods of bacteriological analysis and water treatment were not sufficiently developed at this time for the establishment of quantitative standards.”
Reference: Fischbeck, Paul S. and R. Scott Farrow eds. Improving Regulation: Cases in Environment, Health and Safety. Washington, DC:Resources for the Future. 2001, p. 52.
Commentary: However, in 1912 the common cup was banned on interstate carriers using this law as the basis for regulation by the Treasury Department. In 1914, the first microbiological drinking water regulations were adopted under the Interstate Quarantine Act that governed the quality of water served aboard interstate carriers (trains, riverboats and Great Lakes steamers).
http://query.nytimes.com/mem/archive-free/pdf?res=F10B10FA3C5911738DDDAB0894D8415B8985F0D3 this is where the date is stated.