Drinking water contamination by chromium and lead in industrial lands of Karachi.

Objectives: To identify and quantify chromium and lead as contaminant in water sources of Karachi.

Methods: This water assessment survey was conducted from June 2007 to February 2008 in all the 18 towns of Karachi. In total 216 water samples were collected from ground (n=108) and surface water sources (n = 108).