These links should provide ...

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These links should provide all the answers that you seek:

http://www.lenntech.com/periodic/water/lead/lead-and-water.htm

http://cen.acs.org/articles/94/i7/Lead-Ended-Flints-Tap-Water.html

https://www.scientificamerican.com/video/corrosive-chemistry-how-lead-ended-up-in-flint-s-drinking-water1/

http://www.waterrf.org/PublicReportLibrary/4409.pdf (very detailed, PDF)