When Flint left the Detroit water system last year, it was after years of frustration over the cost and with the anticipation that the city had a cheaper, independent solution. On Thursday, Michigan Gov. Rick Snyder called for Flint to switch back to Detroit's system to address a public health emergency over lead in the water supply. By the numbers, a look at what happened:

$16 million: The amount Flint expected to pay Detroit in 2015 if it had stayed with that system.

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$12.5 million: The amount Flint expected to pay annually under new water authority expected to open in 2016.

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$5 million: The amount Flint expected to save in about two years by temporarily tapping the Flint River until transitioning to the new authority. The decision was made when the city was being run by a state-appointed emergency manager.

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$12 million: The amount it will cost to hook up to Detroit's system through next summer because of lead in the Flint River supply. The state would pay $6 million, Flint $2 million and the Charles Stewart Mott Foundation $4 million.

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$4.6 million: State money Gov. Rick Snyder is seeking or has committed to pay for water filters, testing and additional staffing to address the crisis.

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$30 million: The amount Flint Mayor Dayne Walling is requesting from the state to repair and update citywide water infrastructure, including replacing lead service lines.