These links should provide ...
Published by John Neale, Technical Specialist at Mintek
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
http://www.waterrf.org/PublicReportLibrary/4409.pdf (very detailed, PDF)