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According to data provided by the city, roughly 6.7 percent of the city's underground water pipes were constructed between the 1880s and 1910s.

Another 23.7 percent were constructed between the 1920s and 1950s, 28.8 percent were constructed in the 1960s, 31.5 percent were constructed between the 1970s and 1990s, and 9.3 percent have been constructed since 2000.

mLive, September 2013 - Ann Arbor's increasing sewage overflows and aging sewer system a concern of officials
The city maintains roughly 363 miles of sanitary sewer pipes — more than two-thirds of which were built in the 1960s or earlier.

About 13 percent of the pipes in use today were built in the 1910s, and another 14 percent were built in the '20s, '30s and '40s.

Only about 3 to 4 percent were built since the year 2000, while 25 percent were put in place in the 1970s, '80s and '90s.