WHO Guidelines for Drinking-water Quality

4th Edition. WHO, 2011 - 541 p.This edition considers:
drinking-water safety, including minimum procedures and specific guideline values and how these are intended to be used;
approaches used in deriving the Guidelines, including guideline values;
microbial hazards, which continue to be the primary concern in both developing and developed countries;
climate change, which results in changing water temperature and rainfall patterns, severe and prolonged drought or increased flooding, and its implications for water quality and water scarcity, recognizing the importance of managing these impacts as part of water management strategies;
chemical contaminants in drinking-water, including information on chemicals not considered previously, such as pesticides used for vector control in drinking-water; revisions of existing chemical fact sheets, taking account of new scientific information;
those key chemicals responsible for large-scale health effects through drinking water exposure, including arsenic, fluoride, lead, nitrate, selenium and uranium, providing guidance on identifying local priorities and on management;
the important roles of many different stakeholders in ensuring drinking-water safety;
guidance in situations other than traditional community supplies or managed utilities, such as rainwater harvesting and other non-piped supplies or dual piped systems.