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In the United States and Canada, underground water infrastructure was installed during three main time periods because of population growth in the 1800s, 1900-1945, and post 1945. Pipes made<br>of iron constructed in each of these three eras will all start to fail at nearly the same time over the next couple of decades due to the corrosion of the iron pipes. Additionally, the life span of the materials used since the 1960's has changed. Grey cast iron pipes are no longer manufactured and the new ductile iron material has been made thinner to reduce costs, but as a result, the pipe life expectancy
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