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  It created a new system of water delivery. It also made them global leader in plumbing.
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  Pipes from this time built from hallowed out trees..
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  Between 1868-1920 Chicago installs first city water tower, Homes instaled water heaters, worlds first drinking water treatment system built. In 1906 Willaim E. Sloan invents the flushometer valve. Waste removal from toliets can now be discharged by pressure not by gravity.
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  During the 1930s to 1940s Dr Roy B. Hunter research of plumbing systems, Current plumbing codes are based on his research, after Herbert Hoover to instigate the code
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  shortage of copper pipes leade to usstage of plastic pipe for modern plumbing in 1996
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  Standards for drinking water quality are set by this act.
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  requires the testing for and remedy lead contamination in drinking water in schools and daycare centers.
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  Conserve water mandating maximum water consumption for toliets and showerheads
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  Harmonize lead law by reducing lead content in certain plumbing fixture. President Obama signs the law to take effect january 4, 2014.
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  Reducing lead content in plumbing fixtures from 8.0% to maximum 0.25%