Identifying the sources of waterborne pathogens and determining their impact on health, paying particular attention to the role of recently recognized pathogens, including protozoa and viruses. Developing quantitative methods for risk characterization for infectious agents. Establishing accurate estimates of the disease burden from low-level microbial contamination of drinking- and recreational water, leading to better control measures.
Each year, 3 million people throughout the world die as a direct result of drinking unsafe water. Even in the WHO European Region, there are 120 million people who do not currently enjoy an uninterrupted supply of microbiologically safe drinking-water. In Washington in 1996, city health officials advised people with weakened immune systems to boil their drinking water to eliminate bacteria.
This strategy features in the framework of Agenda 21 as formulated at UNCED (Rio de Janeiro, 1992), now coordinated by the United Nations Commission on Sustainable Development and implemented through national and local authorities. Agenda 21 recommends improving, systematically sampling and evaluating drinking-water quality by introducing appropriate specific measures, including diagnosis of water-borne pathogens and pollutants.
Article 4(2)a of the [Draft Protocol on Water and Health to the 1992 Convention on the Protection and Use of Transboundary Watercourses and International Lakes], requires parties to take all appropriate measures for the purpose of ensuring: Adequate supplies of wholesome drinking water which is free from any micro-organisms, parasites and substances which, owing to their numbers or concentration, constitute a potential danger to human health. This shall include the protection of water resources which are used as sources of drinking water, treatment of water and the establishment, improvement and maintenance of collective systems.