Identifying and prioritizing chemical risks presents a challenge, especially in developing countries, because information on the presence of chemicals in water supplies is often lacking. This document provides guidance to help readers to meet that challenge. It shows how information on aspects such as geology and industrial and agricultural development, which is often readily available, can be used to identify potential chemical contaminants (and potential sources of chemicals), from catchment to consumer, and thus prioritize risks. This is a supporting document to the Guidelines for Drinking-water Quality (WHO 2008 and WHO 2011), and it is aimed at policy-makers, regulators, managers and public health practitioners at national and local level.
WHO (2007): Chemical Safety of Drinking Water Assessing Priorities for Risk Management. Geneva: World Health Organization (WHO) URL [Accessed: 12.10.2011]