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Music video by Rihanna performing Pon de Replay. YouTube view counts pre-VEVO: 4166822. (C) 2005 The Island Def Jam Music Group.
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Drinking water or potable water is water safe enough to be consumed by humans or used with low risk of immediate or long term harm. In most developed countries, the water supplied to households, commerce and industry meets drinking water standards, even though only a very small proportion is actually consumed or used in food preparation. Typical uses (for other than potable purposes) include toilet flushing, washing and landscape irrigation.
Over large parts of the world, humans have inadequate access to potable water and use sources contaminated with disease vectors, pathogens or unacceptable levels of toxins or suspended solids. Drinking or using such water in food preparation leads to widespread acute and chronic illnesses and is a major cause of death and misery in many countries. Reduction of waterborne diseases is a major public health goal in developing countries.
Water has always been an important and life-sustaining drink to humans and is essential to the survival of all known organisms. Excluding fat, water composes approximately 70% of the human body by mass. It is a crucial component of metabolic processes and serves as a solvent for many bodily solutes. The United States Environmental Protection Agency in risk assessment calculations previously assumed that the average American adult ingests 2.0 litres per day. However, the United States Environmental Protection Agency now suggests that either science-based age-specific ranges or an all ages level (based on National Health and Nutrition Examination Survey 2003-2006 data) be used. Bottled water is sold for public consumption throughout the world.
Some health authorities have suggested that people drink at least eight glasses, eight fl oz each (240 mL), of water per day (64 fl oz, or 1.89 litres), and the British Dietetic Association recommends 1.8 litres. This common misconception is not supported by scientific research. Various reviews of all the scientific literature on the topic performed in 2002 and 2008 could not find any solid scientific evidence that recommended drinking eight glasses of water per day. In the US, the reference daily intake (RDI) for water is 3.7 litres per day (L/day) for human males older than 18, and 2.7 L/day for human females older than 18 including water contained in food, beverages, and drinking water. The amount of water varies with the individual, as it depends on the condition of the subject, the amount of physical exercise, and on the environmental temperature and humidity. An individual's thirst provides a better guide for how much water they require rather than a specific, fixed quantity.
In terms of mineral nutrients intake, it is unclear what the drinking water contribution is. Inorganic minerals generally enter surface water and ground water via storm water runoff or through the Earth's crust. Treatment processes also lead to the presence of some minerals. Examples include calcium, zinc, manganese, phosphate, fluoride and sodium compounds. Water generated from the biochemical metabolism of nutrients provides a significant proportion of the daily water requirements for some arthropods and desert animals, but provides only a small fraction of a human's necessary intake. There are a variety of trace elements present in virtually all potable water, some of which play a role in metabolism. For example sodium, potassium and chloride are common chemicals found in small quantities in most waters, and these elements play a role in body metabolism. Other elements such as fluoride, while beneficial in low concentrations, can cause dental problems and other issues when present at high levels.
Profuse sweating can increase the need for electrolyte (salt) replacement. Water intoxication (which results in hyponatremia), the process of consuming too much water too quickly, can be fatal.
Although covering some 70% of the Earth's surface, most water is saline. Freshwater is available in almost all populated areas of the earth, although it may be expensive and the supply may not always be sustainable. Sources where water may be obtained include:
- ground sources such as groundwater, hyporheic zones and aquifers.
- precipitation which includes rain, hail, snow, fog, etc.
- surface water such as rivers, streams, glaciers
- biological sources such as plants.
- the sea through desalination
- water supply network
Spring water is groundwater that rises to the ground surface. Springs are often used as sources for bottled waters. Tap water, delivered by domestic water systems in developed nations, refers to water piped to homes and delivered to a tap or spigot. For these water sources to be consumed safely they must receive adequate treatment and meet drinking water regulations.
The most efficient way to transport and deliver potable water is through pipes. Plumbing can require significant capital investment. Some systems suffer high operating costs. The cost to replace the deteriorating water and sanitation infrastructure of industrialized countries may be as high as $200 billion a year. Leakage of untreated and treated water from pipes reduces access to water. Leakage rates of 50% are not uncommon in urban systems.
Because of the high initial investments, many less wealthy nations cannot afford to develop or sustain appropriate infrastructure, and as a consequence people in these areas may spend a correspondingly higher fraction of their income on water. 2003 statistics from El Salvador, for example, indicate that the poorest 20% of households spend more than 10% of their total income on water. In the United Kingdom authorities define spending of more than 3% of one's income on water as a hardship.
The World Health Organization/UNICEF Joint Monitoring Program (JMP) for Water Supply and Sanitation  is the official United Nations mechanism tasked with monitoring progress towards the Millennium Development Goal (MDG) relating to drinking-water and sanitation (MDG 7, Target 7c), which is to: "Halve, by 2015, the proportion of people without sustainable access to safe drinking-water and basic sanitation". The JMP is required to use the following MDG indicator for monitoring the water component of this: Proportion of population using an improved drinking-water source.
According to this indicator on improved water sources, the MDG was met in 2010, five years ahead of schedule. Over 2 billion more people used improved drinking water sources in 2010 than did in 1990. However, the job is far from finished. 780 million people are still without improved sources of drinking water, and many more still lack safe drinking water: complete information about drinking water safety is not yet available for global monitoring of safe drinking water. Continued efforts are needed to reduce urban-rural disparities and inequities associated with poverty; to dramatically increase coverage in countries in sub-Saharan Africa and Oceania; to promote global monitoring of drinking water quality; and to look beyond the MDG target towards universal coverage.
In the U.S, the typical single family home uses 69.3 gallons (262 litres) of water per day. This includes (in decreasing order) toilet use, washing machine use, showers, baths, faucet use, and leaks. In some parts of the country there are water supplies that are dangerously low due to drought, particularly in the West and the South East region of the U.S.[better source needed]
Improving availability 
Solar water disinfection is a low-cost method of purifying water that can often be implemented with locally available materials. Unlike methods that rely on firewood, it has low impact on the environment.
One organisation working to improve the availability of safe drinking water in some the world's poorest countries is WaterAid International. Operating in 26 countries, WaterAid is working to make lasting improvements to peoples' quality of life by providing long-term sustainable access to clean water in countries such as Nepal, Tanzania, Ghana and India. It also works to educate people about sanitation and hygiene.
The Global Framework for Action (GF4A) is an organization that brings together stakeholders, national governments, donors and NGOs (such as Water aid) to define manageable targets and deadlines. 23 Countries are off-track to meet the MDG goals for improved water availability.
Well contamination 
Some efforts at increasing the availability of safe drinking water have been disastrous. When the 1980s were declared the "International Decade of Water" by the United Nations, the assumption was made that groundwater is inherently safer than water from rivers, ponds, and canals. While instances of cholera, typhoid and diarrhea were reduced, other problems emerged.
Sixty million people are estimated to have been poisoned by well water contaminated by excessive fluoride, which dissolved from granite rocks. The effects are particularly evident in the bone deformations of children. Similar or larger problems are anticipated in other countries including China, Uzbekistan, and Ethiopia. Although helpful for dental health in low dosage, fluoride in large amounts interferes with bone formation.
Half of the Bangladesh's 12 million tube wells contain unacceptable levels of arsenic due to the wells not being dug deep enough (past 100 metres). The Bangladeshi government had spent less than US$7 million of the 34 million allocated for solving the problem by the World Bank in 1998. Natural arsenic poisoning is a global threat, 140 million people affected in 70 countries on all continents. These examples illustrate the need to examine each location on a case by case basis and not assume what works in one area will work in another.
Diarrhea as a major health effect among children 
Over 90% of deaths from diarrheal diseases in the developing world today occur in children under 5 years old. Malnutrition, especially protein-energy malnutrition, can decrease the children's resistance to infections, including water-related diarrheal diseases. From 2000-2003, 769,000 children under five years old in sub-Saharan Africa died each year from diarrheal diseases. As a result of only thirty-six percent of the population in the sub-Saharan region having access to proper means of sanitation, more than 2000 children's lives are lost every day. In South Asia, 683,000 children under five years old died each year from diarrheal disease from 2000-2003. During the same time period, in developed countries, 700 children under five years old died from diarrheal disease. Improved water supply reduces diarrhea morbidity by twenty-five percent and improvements in drinking water through proper storage in the home and chlorination reduces diarrhea episodes by thirty-nine percent.
Water quality and contaminants 
Parameters for drinking water quality typically fall under three categories:
Chemical parameters tend to pose more of a chronic health risk through buildup of heavy metals although some components like nitrates/nitrites and arsenic can have a more immediate impact. Physical parameters affect the aesthetics and taste of the drinking water and may complicate the removal of microbial pathogens.
Originally, fecal contamination was determined with the presence of coliform bacteria, a convenient marker for a class of harmful fecal pathogens. The presence of fecal coliforms (like E. Coli) serves as an indication of contamination by sewage. Additional contaminants include protozoan oocysts such as Cryptosporidium sp., Giardia lamblia, Legionella, and viruses (enteric). Microbial pathogenic parameters are typically of greatest concern because of their immediate health risk.
Throughout most of the world, the most common contamination of raw water sources is from human sewage and in particular human faecal pathogens and parasites. In 2006, waterborne diseases were estimated to cause 1.8 million deaths each year while about 1.1 billion people lacked proper drinking water. It is clear that people in the developing world need to have access to good quality water in sufficient quantity, water purification technology and availability and distribution systems for water. In many parts of the world the only sources of water are from small streams often directly contaminated by sewage.
There is increasing concern over the health effects of engineered nanoparticles (ENPs) released into the natural environment. One potential indirect exposure route is through the consumption of contaminated drinking waters. In order to address these concerns, the U.K. Drinking Water Inspectorate (DWI) has published a "Review of the risks posed to drinking water by man-made nanoparticles" (DWI 70/2/246). The study, which was funded by the Department for Food and Rural Affairs (Defra), was undertaken by the Food and Environment Research Agency (Fera) in collaboration with a multi-disciplinary team of experts including scientists from the Institute of Occupational Medicine/SAFENANO. The study explored the potential for ENPs to contaminate drinking water supplies and to establish the significance of the drinking water exposure route compared to other routes of exposure.
Safety indicators 
Access to safe drinking water is indicated by proper sanitary sources. These improved drinking water sources include household connection, public standpipe, borehole condition, protected dug well, protected spring, and rain water collection. Sources that don't encourage improved drinking water to the same extent as previously mentioned include: unprotected wells, unprotected springs, rivers or ponds, vender-provided water, bottled water (consequential of limitations in quantity, not quality of water), and tanker truck water. Access to sanitary water comes hand in hand with access to improved sanitation facilities for excreta. These facilities include connection to public sewer, connection to septic system, pour-flush latrine, and ventilated improved pit latrine. Unimproved sanitation facilities are: public or shared latrine, open pit latrine, or bucket latrine. (See Sanitation.)
Water treatment 
Most water requires some type of treatment before use, even water from deep wells or springs. The extent of treatment depends on the source of the water. Appropriate technology options in water treatment include both community-scale and household-scale point-of-use (POU) designs. A few large urban areas such as Christchurch, New Zealand have access to sufficiently pure water of sufficient volume that no treatment of the raw water is required.
Over the past decade, an increasing number of field-based studies have been undertaken to determine the success of POU measures in reducing waterborne disease. The ability of POU options to reduce disease is a function of both their ability to remove microbial pathogens if properly applied and such social factors as ease of use and cultural appropriateness. Technologies may generate more (or less) health benefit than their lab-based microbial removal performance would suggest.
The current priority of the proponents of POU treatment is to reach large numbers of low-income households on a sustainable basis. Few POU measures have reached significant scale thus far, but efforts to promote and commercially distribute these products to the world's poor have only been under way for a few years.
In emergency situations when conventional treatment systems have been compromised, water borne pathogens may be killed or inactivated by boiling but this requires abundant sources of fuel, and can be very onerous on consumers, especially where it is difficult to store boiled water in sterile conditions and is not a reliable way to kill some encysted parasites such as Cryptosporidium or the bacterium Clostridium. Other techniques, such as filtration, chemical disinfection, and exposure to ultraviolet radiation (including solar UV) have been demonstrated in an array of randomized control trials to significantly reduce levels of water-borne disease among users in low-income countries, but these suffer from the same problems as boiling methods.
European Union 
The EU sets legislation on water quality. Directive 2000/60/EC of the European Parliament and of the Council of 23 October 2000 establishing a framework for Community action in the field of water policy, known as the water framework directive, is the primary piece of legislation governing water. The Drinking water directive relates specifically to water intended for human consumption.
Each member state is responsible for establishing the required policing measures to ensure that the legislation is implemented. For example, in the UK the Water Quality Regulations prescribe maximum values for substances that affect wholesomeness and the Drinking Water Inspectorate polices the water companies.
United States 
In the United States, the Environmental Protection Agency (EPA) sets standards for tap and public water systems under the Safe Drinking Water Act (SDWA). The Food and Drug Administration (FDA) regulates bottled water as a food product under the Federal Food, Drug, and Cosmetic Act (FFDCA). Bottled water is not necessarily more pure, or more tested, than public tap water. There is evidence that the United States federal drinking water regulations do not ensure safe water, as some of the regulations have not been updated with more recent science. Dr. Peter W. Preuss, who became the head of the U.S. EPA's division analyzing environmental risks in 2004, has been "particularly concerned", and has faced controversy in studies which suggest that regulations against certain chemicals should be tightened.
In 2010 the EPA showed that 54 active pharmaceutical ingredients and 10 metabolites had been found in treated drinking water. An earlier study from 2005 by the EPA and the Geographical Survey states that 40% of water was contaminated with nonprescription pharmaceuticals, and it has been reported that of the 8 of the 12 most commonly occurring chemicals in drinking water are estrogenic hormones. Of the pharmaceutical components found in drinking water, the EPA only regulates lindane and perchlorate. In 2009, the EPA did announce another 13 chemicals, hormones, and antibiotics that could potentially be regulated. The decision on whether or not they are sufficiently harmful to be regulated may not be decided upon until 2012 as it takes time for testing.
Russian Federation 
A list of normative documents that regulate the quality of drinking water in Russia:
- Sanitary norms and rules SanPin 126.96.36.1994-01 "Drinking Water. Hygienic requirements for water quality of centralized drinking water supply. Quality Control. "
- Sanitary norms and rules SanPin 188.8.131.526-02 "Drinking Water. Hygienic requirements for water quality, packaged in a container. Quality Control. "
Preferences of animals 
The qualitative and quantitative aspects of drinking water requirements of domesticated animals are studied and described within the context of animal husbandry. However, relatively few studies have been focused on the drinking behavior of wild animals. A recent study has shown that feral pigeons do not discriminate drinking water according to its content of metabolic wastes, such as uric acid or urea (mimicking faeces-pollution by birds or urine-pollution by mammals respectively).
See also 
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- U.S. Environmental Protection Agency (EPA). Dallas, TX (2000-05)."Chapter 3: Exposure Scenario Selection". Retrieved 2007-02-19. RCRA Delisting Technical Support Document. p. 8.
- U.S. Environmental Protection Agency (EPA). Washington, DC (EPA/600/R-09/052F)."Exposure Factors Handbook: 2011 Edition". Retrieved 2012-09-06.
- "The Benefits of Water". Cleveland Clinic. Archived from the original on 2007-01-16. Retrieved 2007-02-19.
- Research debunks health value of guzzling water. Reuters, April 2008.
- H. Valtin, Drink at least eight glasses of water a day." Really? Is there scientific evidence for "8 × 8"? Am J Physiol Regul Integr Comp Physiol 283: R993-R1004, 2002.
- Negoianu, Dan; Goldfarb, Stanley (2008). "Just add water" (PDF). J. Am. Soc. Nephrol 19 (6): 1041–1043. doi:10.1681/ASN.2008030274. PMID 18385417.
- "US daily reference intake values". Iom.edu. Retrieved 2011-12-05.
- Maton, Anthea bj; Jean Hopkins, Charles William McLaughlin, Susan Johnson, Maryanna Quon Warner, David LaHart, Jill D. Wright (1993). Human Biology and Health. Englewood Cliffs, New Jersey, USA: Prentice Hall. ISBN 0-13-981176-1.
- World Health Organization (WHO). Geneva, Switzerland. Joyce Morrissey Donohue, Charles O. Abernathy, Peter Lassovszky, George Hallberg. "The contribution of drinking-water to total dietary intakes of selected trace mineral nutrients in the United States." Draft, August 2004.
- Noakes TD, Goodwin N, Rayner BL, et al. (1985). "Water intoxication: a possible complication during endurance exercise". Med Sci Sports Exerc 17 (3): 370–375. PMID 4021781.
- Noakes TD, Goodwin N, Rayner BL, Branken T, Taylor RK (2005). "Water intoxication: a possible complication during endurance exercise, 1985". Wilderness Environ Med 16 (4): 221–7. doi:10.1580/1080-6032(2005)16[221:WIAPCD]2.0.CO;2. PMID 16366205.
- Schardt, David (2000). "Water, Water Everywhere." Center for Science in the Public Interest, Washington, D.C. Accessed 2010-10-26.
- Hall, Ellen L.; Dietrich, Andrea M. (2000). "A Brief History of Drinking Water." Washington: American Water Works Association. Product No. OPF-0051634, Accessed 2012-06-13.
- United Nations. World Water Assessment Programme (2009). "Water in a Changing World: Facts and Figures." World Water Development Report 3. p.58 Accessed 2012-06-13.
-  BBC News The water vendors of Nigeria Referenced 2008-10-20
-  page 51 Referenced 2008-10-20
- WHO and UNICEF JMP website homepage, WHO, Geneva and UNICEF, New York, accessed on June 10, 2012
- United Nations:World Water Assessment Program, accessed on February 27, 2010
- WHO and UNICEF Progress on Drinking-water and Sanitation: 2012 Update, WHO, Geneva and UNICEF, New York
- "Cashing in on climate change". IBISWorld. 29 May 2008. Archived from the original on 4 October 2008.
- Africa and the Millennium Development Goals [www.un.org/millenniumgoals/docs/MDGafrica07.pdf]
- Conroy, RM.; Meegan, ME.; Joyce, T.; McGuigan, K.; Barnes, J. (October 1999). "Solar disinfection of water reduces diarrhoeal disease: an update". Arch Dis Child 81 (4): 337–8. doi:10.1136/adc.81.4.337. PMC 1718112. PMID 10490440.
- Conroy, R.M.; Meegan, M.E.; Joyce, T.M.; McGuigan, K.G.; Barnes, J. (2001). "Solar disinfection of drinking water protects against cholera in children under 6 years of age". Arch Dis Child 85 (4): 293–295. doi:10.1136/adc.85.4.293. PMC 1718943. PMID 11567937.
- Rose, A; Roy, S; Abraham, V; Holmgren, G; George, K; Balraj, V; Abraham, S; Muliyil, J et al. (2006). "Solar disinfection of water for diarrhoeal prevention in southern India". Arch Dis Child 91 (2): 139–141. doi:10.1136/adc.2005.077867. PMC 2082686. PMID 16403847.
- Hobbins M. (2003). The SODIS Health Impact Study, Ph.D. Thesis, Swiss Tropical Institute Basel
- "Where we work". WaterAid. 2011-10-26. Retrieved 2011-12-05.
- "water and sanitation for all - International site". WaterAid. 2011-11-30. Retrieved 2011-12-05.
- World Health Organization. Global Framework for Action on Sanitation and Water Supply (2009-07-21). "Frequently Asked Questions." Working document.
- Pearce, Fred (2006). When the Rivers Run Dry: Journeys Into the Heart of the World's Water Crisis. Toronto: Key Porter. ISBN 978-1-55263-741-8.
- Bagla, Pallava (2003-06-05). "Arsenic-Laced Well Water Poisoning Bangladeshis". National Geographic News (Washington: National Geographic Society).
- Bagchi, Sanjit (2007-11-20). "Arsenic threat reaching global dimensions". Canadian Medical Association Journal 177 (11): 1344–45. doi:10.1503/cmaj.071456. ISSN 1488-2329. PMC 2072985. PMID 18025421.
- WHO/UNICEF, Water for life: making it happen
- EPA. Washington, D.C. "Drinking Water Contaminants: Microorganisms." 2010-09-21.
- U.S. Centers for Disease Control and Prevention. Atlanta, Georgia. "Safe Water System: A Low-Cost Technology for Safe Drinking Water." Fact Sheet, World Water Forum 4 Update. March 2006.
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- Centre for Affordable Water and Sanitation Technology. Calgary, Alberta. "Household Water Treatment Guide," March 2008.
- Christchurch City Council. Christchurch, NZ. "Our water - Water supply." Accessed 2010-10-26.
- World Health Organization, Geneva (2004). "Guidelines for Drinking-water Quality. Volume 1: Recommendations." 3rd ed.
- Clasen, T.; Schmidt, W.; Rabie, T.; Roberts, I.; Cairncross, S. (2007-03-12). "Interventions to improve water quality for preventing diarrhoea: systematic review and meta-analysis". British Medical Journal 334 (7597): 782. doi:10.1136/bmj.39118.489931.BE. PMC 1851994. PMID 17353208.
- ISO 24510 Activities relating to drinking water and wastewater services. Guidelines for the assessment and for the improvement of the service to users
- Maria, Kaika (April 2003). "The Water Framework Directive: A New Directive for a Changing Social, Political and Economic European Framework". European Planning Studies, (Taylor and Francis Group) 11 (3): 299–316. doi:10.1080/09654310303640. Retrieved 2009-02-10.
- Pub.L. 93-523; 42 U.S.C. § 300f et seq. December 16, 1974.
- June 25, 1938, ch. 675, 52 Stat. 1040; 21 U.S.C. § 301 et seq.
- EPA. "Ground water and drinking water - Customer Service." Accessed 2010-10-26.
- Duhigg, Charles (2009-12-16). "That Tap Water Is Legal but May Be Unhealthy". New York Times. p. A1.
- Biological Water Filters says:. "Pharmaceuticals in the Water Supply: Is this a threat? – Water Matters - State of the Planet". Blogs.ei.columbia.edu. Retrieved 2011-12-05.
- SanPin 184.108.40.2064-01 "Drinking Water. Hygienic requirements for water quality of centralized drinking water supply. Quality Control."
- SanPin SanPin 220.127.116.116-02 "Drinking Water. Hygienic requirements for water quality, packaged in a container. Quality Control. "
- Olah G, Rózsa L (2006). "Nitrogen metabolic wastes do not influence drinking water preference in feral pigeons" (pdf). Acta Zoologica Academiae Scientiarum Hungaricae 52 (4): 401–406.
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- U.S. Centers for Disease Control and Prevention (CDC) Healthy Water - Drinking Water One-stop resource for drinking water
- National Pesticide Information Center - Pesticide in Drinking Water Fact Sheet
- National Pesticide Information Center - Antimicrobials for Food Processing and Drinking Water Systems
- US Environmental Protection Agency - National drinking water program - General info, regulations & technical publications
- WHO - Water Sanitation and Health: drinking water quality
- WHO - Water Sanitation and Health: potabilization systems
- The International Water Association
- Waterwedrink - Links to worldwide drinking water quality websites
- UNICEF State of the World's Children 2009 Full Report with Statistics
- In Historic Vote, UN Declares Water a Fundamental Human Right - video report by Democracy Now!
- Many beverages provide important for human hydration