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Life expectancy of water distribution lines

Cast iron pipes – Used during the late 19th and early 20th centuries  ​120 years
​Iron pipes – Introduced in the 1920s and thinner than cast iron pipes ​100 years
​Ductile iron pipes - In use beginning in the 1950s​100 years
​Polyvinyl Chloride (PVC) - Popular in the 1970s​70 years
​High-density Polyethylene – Popular since 1990s​70 years

A water treatment plant has a life span between 25 and 50 years - U.S. Environmental Protection Agency

Sources: American Water Works Association, U.S. Environmental Protection Agency, American Water Works Service Company