Hundreds of miles of clay and concrete sewer pipes in Sacramento, Calif., are more than 100 years old, posing "a bigger potential for catastrophic failures," says Dave Brent, interim director of the city's Department of Utilities. The city spends $3.7 million a year to upgrade the lines, but at that rate, it would take 650 years to replace the system. The city needs $2.4 billion to replace all the pipes, which means that residents' utility bills will increase. "We're almost at emergency mode," said Councilwoman Sandy Sheedy.

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