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Data of Flint water pH has become more acidic. Monthly average pH measurements dropped from 8.07 in December 2014 to 7.34 in August 2015 (P 3,4)

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Smith says they consider a pH of 7.5 to be acceptable, but

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Smith says they consider a pH of 7.5 to be acceptable, but Marc Edwards and Daniel Giammar recommend pH of 8 or above to minimize lead

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Smith says

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Liane Shekter Smith, head of DEQ’s Office of Drinking Water and Municipal Assistance, says

"Absolutely, we've been monitoring the pH data. We monitored it prior to the switch to the Flint River and we monitored it since. And we've compared the pH data and there has not been a significant change."
(P 2)

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If using lime for corrosion control, you need to make sure water hits a certain pH (P 2)

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Lead levels in children's blood have spiked since the with to the Flint River (P 3, 4)

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The water softening treatment Flint is using is actually making Flint's water more corrosive. (P 2)

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Flint claimed to use Lime Daniel Giammar, professor of environmental engineering at Washington University in St. Louis, Missouri, says "Simply claiming to have lime addition as corrosion control is insufficient". (P 2)

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State regulators told federal regulators that Flint is not using corrosion control. Despite this, Michigan Dept. of Environmental Quality Director Dan Wyant said, "Know that when the city switched from Detroit sewer and water, that the city utilized corrosion controls". (P 2,3,4)