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Drinking water or potable water is water that is safe for ingestion, either when drunk directly in liquid form or consumed indirectly through food preparation. It is often (but not always) supplied through taps, in which case it is also called tap water.
The amount of drinking water required to maintain good health varies, and depends on physical activity level, age, health-related issues, and environmental conditions.<ref name="WHO2004">Template:Cite book This 2004 article focuses on the USA context and uses data collected from the US military.</ref><ref name="EPA2011">Template:Cite book</ref> For those who work in a hot climate, up to Template:Convert a day may be required.<ref name=WHO2004/>
About 1 to 2 billion people lack safe drinking water.<ref name=WHO2018>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Water can carry vectors of disease and is a major cause of death and illness worldwide.<ref name=":3">Template:Cite news</ref> Developing countries are most affected by unsafe drinking water.
SourcesEdit
Potable water is available in almost all populated areas of the world, although it may be expensive, and the supply may not always be sustainable. Sources where drinking water is commonly obtained include springs, hyporheic zones and aquifers (groundwater), from rainwater harvesting, surface water (from rivers, streams, glaciers), or desalinated seawater.
For these water sources to be consumed safely, they must receive adequate water treatment and meet drinking water quality standards.<ref>Hall, Ellen L.; Dietrich, Andrea M. (2000). "A Brief History of Drinking Water." Template:Webarchive Washington: American Water Works Association. Product No. OPF-0051634, Accessed 13 June 2012.</ref>
An experimental source is solar-powered atmospheric water generators.<ref name="10.1038/s41586-021-03900-w">Template:Cite journal</ref>
Springs are often used as sources for bottled waters.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
SupplyEdit
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The most efficient and convenient 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.<ref>United Nations. World Water Assessment Programme (2009). "Water in a Changing World: Facts and Figures." Template:Webarchive World Water Development Report 3. p. 58 Accessed 13 June 2012.</ref>
Tap water, delivered by domestic water systems refers to water piped to homes and delivered to a tap or spigot.
QuantityEdit
Usage for general household useEdit
In the United States, the typical water consumption per capita, at home, is Template:Convert of water per day.<ref>Mayer, P.W.; DeOreo, W.B.; Opitz, E.M.; Kiefer, J.C.; Davis, W.Y.; Dziegielewski, B.; & Nelson, J.O., 1999. Residential End Uses of Water. AWWARF and AWWA, Denver.</ref><ref>William B. DeOreo, Peter Mayer, Benedykt Dziegielewski, Jack Kiefer. 2016. Residential End Uses of Water, Version 2. Water Research Foundation. Denver, Colorado.</ref> Of this, only 1% of the water provided by public water suppliers is for drinking and cooking.<ref name=":0">Joseph Cotruvo, Victor Kimm, Arden Calvert. "Drinking Water: A Half Century of Progress." Template:Webarchive EPA Alumni Association. 1 March 2016.</ref> Uses include (in decreasing order) toilets, washing machines, showers, baths, faucets, and leaks.
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Usage for drinkingTemplate:AnchorEdit
AnimalsEdit
The qualitative and quantitative aspects of drinking water requirements on domesticated animals are studied and described within the context of animal husbandry. For example, a farmer might plan for Template:Convert per day for a dairy cow, a third of that for a horse, and a tenth of that for a hog.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
However, relatively few studies have been focused on the drinking behavior of wild animals.
QualityEdit
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According to the World Health Organization's 2017 report, safe drinking water is water that "does not represent any significant risk to health over a lifetime of consumption, including different sensitivities that may occur between life stages".<ref name="WHO_2017" />Template:Rp
According to a report by UNICEF and UNESCO, Finland has the best drinking water quality in the world.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
Parameters to monitor qualityEdit
Parameters for drinking water quality typically fall within three categories: microbiological, chemical, physical.
Microbiological parameters include coliform bacteria, E. coli, and specific pathogenic species of bacteria (such as cholera-causing Vibrio cholerae), viruses, and protozoan parasites. 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).<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Microbial pathogenic parameters are typically of greatest concern because of their immediate health risk.
Physical and chemical parameters include heavy metals, trace organic compounds, total suspended solids, and turbidity. 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.
Pesticides are also potential drinking water contaminants of the category chemical contaminants. Pesticides may be present in drinking water in low concentrations, but the toxicity of the chemical and the extent of human exposure are factors that are used to determine the specific health risk.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
Perfluorinated alkylated substances (PFAS) are a group of synthetic compounds used in a large variety of consumer products, such as food packaging, waterproof fabrics, carpeting and cookware. PFAS are known to persist in the environment and are commonly described as persistent organic pollutants. PFAS chemicals have been detected in blood, both humans and animals, worldwide, as well as in food products, water, air and soil.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Animal testing studies with PFAS have shown effects on growth and development, and possibly effects on reproduction, thyroid, the immune system and liver.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> As of 2022 the health impacts of many PFAS compounds are not understood. Scientists are conducting research to determine the extent and severity of impacts from PFAS on human health.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> PFAS have been widely detected in drinking water worldwide and regulations have been developed, or are under development, in many countries.<ref>Template:Cite journal</ref>
Drinking water quality standardsEdit
Health issues due to low qualityEdit
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The World Health Organization considers access to safe drinking-water a basic human right. Contaminated water is estimated to result in more than half a million deaths per year.<ref name="WHO2014" /> More people die from unsafe water than from war, then-U.N. secretary-general Ban Ki-moon said in 2010.<ref name=":3" /> Contaminated water together with the lack of sanitation was estimated to cause about one percent of disability adjusted life years worldwide in 2010.<ref>Template:Cite journal</ref> According to the WHO, the most common diseases linked with poor water quality are cholera, diarrhea, dysentery, hepatitis A, typhoid, and polio.<ref name=":1">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
One of the main causes for contaminated drinking water in developing countries is lack of sanitation and poor hygiene. For this reason, the quantification of the burden of disease from consuming contaminated drinking water usually looks at water, sanitation and hygiene aspects together. The acronym for this is WASH - standing for water, sanitation and hygiene.
Diarrhea, malnutrition and stuntingEdit
Consumption of contaminated groundwaterEdit
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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.<ref name="Pearce">Template:Cite book</ref>
Long-term consumption of water with high fluoride concentration (> 1.5 ppm F) can have serious undesirable consequences such as dental fluorosis, enamel mottle and skeletal fluorosis, bone deformities in children. Fluorosis severity depends on how much fluoride is present in the water, as well as people's diet and physical activity. Defluoridation methods include membrane-based methods, precipitation, absorption, and electrocoagulation.<ref name=":13">Template:Cite book</ref>
Natural arsenic contamination of groundwater is a global threat with 140 million people affected in 70 countries globally.<ref>Template:Cite journal</ref>
Examples of poor drinking water quality incidentsEdit
Some well-known examples of water quality problems with drinking water supplies include:<ref name=":03">Template:Cite journal File:CC-BY icon.svg Text was copied from this source, which is available under a Creative Commons Attribution 4.0 International License</ref>
- In 1854, a cholera outbreak in London's Soho district was identified by John Snow as originating from contaminated water from the Broad Street pump. This can be regarded as a founding event of the science of epidemiology.
- Contamination of groundwater with arsenic in Bangladesh; considered to be "the largest-scale mass poisoning of a population" (began in the 1970s–1980s, officially recognized in 1993)
- Hinkley groundwater contamination (Chromium-6 contamination of private groundwater wells in Hinkley, California, United States (settled in 1996).
- Walkerton E. coli outbreak (Escherichia coli O157:H7 and Campylobacter contamination of water supply in Walkerton, Ontario, Canada in 2000). In 2000, an E. coli outbreak occurred in Walkerton, Ontario, Canada. Seven people died from drinking contaminated water. Hundreds suffered from the symptoms of the disease, not knowing if they too would die.<ref name="walkon">{{#invoke:citation/CS1|citation
|CitationClass=web }}</ref>
- Flint water crisis (lead and Legionella contamination of water supply in Flint, Michigan, United States, started in 2014)
- Jackson, Mississippi water crisis, United States (2022)
Water supply can get contaminated by pathogens which may originate from human excreta, for example due to a breakdown or design fault in the sanitation system, or by chemical contaminants.
Further examples of contamination include:
- In 1987, a cryptosporidiosis outbreak is caused by the public water supply of which the filtration was contaminated, in western Georgia<ref name="lcoc">Template:Cite journal</ref>
- In 1993, Milwaukee Cryptosporidium outbreak
- In 1998, an outbreak of typhoid fever in northern Israel, which was associated with the contaminated municipal water supply<ref name="aotf">Template:Cite journal</ref>
- In 1997, 369 cases of cryptosporidiosis occurred, caused by a contaminated fountain in the Minnesota zoo. Most of the sufferers were children<ref name="ocaw">Template:Cite journal</ref>
- In 1998, a non-chlorinated municipal water supply was blamed for a campylobacteriosis outbreak in northern Finland<ref name="aloc">Template:Cite journal</ref>
- In 2000, a gastroenteritis outbreak that was brought by a non-chlorinated community water supply, in southern Finland<ref name="aognc">Template:Cite journal</ref>
- In 2004, contamination of the community water supply, serving the Bergen city centre of Norway, was later reported after the outbreak of waterborne giardiasis<ref name="alcow">Template:Cite journal</ref>
- In 2007, contaminated drinking water was pinpointed which had led to the outbreak of gastroenteritis with multiple aetiologies in Denmark<ref name="osgm">Template:Cite journal</ref>
Examples of chemical contamination include:
- In 1988, many people were poisoned in Camelford, when a worker put 20 tonnes of aluminium sulphate coagulant in the wrong tank.
- In 1993, a fluoride poisoning outbreak resulting from overfeeding of fluoride, in Mississippi<ref name="oafp">Template:Cite journal</ref>
- In 2019 oil for an electric transformer oil entered the water supply for the city of Uummannaq in Greenland. A cargo ship in harbour was able to maintain a minimum supply to the city for two days until the mains supply was restored and flushing of all the pipework was started.<ref>{{#invoke:citation/CS1|citation
|CitationClass=web }}</ref>
TreatmentEdit
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Most water requires some 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.<ref name="cawstHWT">Centre for Affordable Water and Sanitation Technology. Calgary, Alberta. "Household Water Treatment Guide," March 2008. Template:Webarchive.</ref> Only 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.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
In emergency situations when conventional treatment systems have been compromised, waterborne pathogens may be killed or inactivated by boiling<ref>World Health Organization, Geneva (2004). "Guidelines for Drinking-water Quality. Volume 1: Recommendations." Template:Webarchive 3rd ed.</ref> 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. 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,<ref>Template:Cite journal</ref> but these suffer from the same problems as boiling methods.
Another type of water treatment is called desalination and is used mainly in dry areas with access to large bodies of saltwater.
Publicly available treated water has historically been associated with major increases in life expectancy and improved public health. Water disinfection can greatly reduce the risks of waterborne diseases such as typhoid and cholera. Chlorination is currently the most widely used water disinfection method, although chlorine compounds can react with substances in water and produce disinfection by-products (DBP) that pose problems to human health.<ref>Template:Cite book</ref> Local geological conditions affecting groundwater are determining factors for the presence of various metal ions, often rendering the water "soft" or "hard".Template:Citation needed
In the event of contamination of drinking water, government officials typically issue an advisory regarding water consumption. In the case of biological contamination, residents are usually advised to boil their water before consumption or to use bottled water as an alternative. In the case of chemical contamination, residents may be advised to refrain from consuming tap water entirely until the matter is resolved.
Point of use methodsEdit
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The ability of point of use (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.
Solar water disinfection is a low-cost method of purifying water that can often be implemented with locally available materials.<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref><ref>Template:Cite journal</ref><ref>Hobbins M. (2003). The SODIS Health Impact Study, Ph.D. Thesis, Swiss Tropical Institute Basel</ref> Unlike methods that rely on firewood, it has low impact on the environment.
Addition of fluorideEdit
In many areas, low concentration of fluoride (< 1.0 ppm F) is intentionally added to tap water to improve dental health, although in some communities water fluoridation remains a controversial issue. (See water fluoridation controversy).
Global accessEdit
According to the World Health Organization (WHO), "access to safe drinking-water is essential to health, a basic human right and a component of effective policy for health protection."<ref name="WHO_2017">Template:Cite report</ref>Template:Rp In 1990, only 76 percent of the global population had access to drinking water. By 2015 that number had increased to 91 percent.<ref name="ourworldindata_Hannah_2018">Template:Citation</ref> In 1990, most countries in Latin America, East and South Asia, and Sub-Saharan Africa were well below 90%. In Sub-Saharan Africa, where the rates are lowest, household access ranges from 40 to 80 percent.<ref name="ourworldindata_Hannah_2018" /> Countries that experience violent conflict can have reductions in drinking water access: One study found that a conflict with about 2,500 battle deaths deprives 1.8% of the population of potable water.<ref>Template:Cite journal</ref>
Typically in developed countries, tap water meets drinking water quality standards, even though only a small proportion is actually consumed or used in food preparation. Other typical uses for tap water include washing, toilets, and irrigation. Greywater may also be used for toilets or irrigation. Its use for irrigation however may be associated with risks.<ref name="WHO2014" />
Globally, by 2015, 89% of people had access to water from a source that is suitable for drinkingTemplate:Sndcalled improved water sources.<ref name="WHO2014">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> In sub-Saharan Africa, access to potable water ranged from 40% to 80% of the population. Nearly 4.2 billion people worldwide had access to tap water, while another 2.4 billion had access to wells or public taps.<ref name="WHO2014" />
By 2015, 5.2 billion people representing 71% of the global population used safely managed drinking water services.<ref name="WHO_UNICEF_Progress_2017">Template:Cite report</ref> As of 2017, 90% of people having access to water from a source that is suitable for drinkingTemplate:Sndcalled improved water sourceTemplate:Sndand 71% of the world could access safely managed drinking water that is clean and available on-demand.<ref name="WHO2014" /> Estimates suggest that at least 25% of improved sources contain fecal contamination.<ref name="PLoS_Bain_2014" /> 1.8 billion people still use an unsafe drinking water source which may be contaminated by feces.<ref name="WHO2014" /> This can result in infectious diseases, such as gastroenteritis, cholera, and typhoid, among others.<ref name="WHO2014" /> Reduction of waterborne diseases and development of safe water resources is a major public health goal in developing countries. In 2017, almost 22 million Americans drank from water systems that were in violation of public health standards, which could contribute to citizens developing water-borne illnesses.<ref>U.S. Environmental Protection Agency. Report on the environment: drinking water. Available at: https://cfpub.epa.gov. Accessed March 3, 2023. Template:Webarchive</ref>Template:Full citation needed Safe drinking water is an environmental health concern. Bottled water is sold for public consumption in most parts of the world.
Improved sources are also monitored based on whether water is available when needed (5.8 billion people), located on premises (5.4 billion), free from contamination (5.4 billion), and within a 30-minute round trip.<ref name="WHO_UNICEF_Progress_2017" />Template:Rp While improved water sources such as protected piped water are more likely to provide safe and adequate water as they may prevent contact with human excreta, for example, this is not always the case.<ref name="ourworldindata_Hannah_2018" /> According to a 2014 study, approximately 25% of improved sources contained fecal contamination.<ref name="PLoS_Bain_2014" />
The population in Australia, New Zealand, North America and Europe have achieved nearly universal basic drinking water services.<ref name="WHO_UNICEF_Progress_2017" />Template:Rp
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.<ref>Template:Cite news</ref> 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.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }} page 51 Referenced 20 October 2008</ref>
Global monitoring of accessEdit
The WHO/UNICEF Joint Monitoring Program (JMP) for Water Supply and Sanitation<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> 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".<ref>United Nations:World Water Assessment Program Template:Webarchive, accessed on 27 February 2010</ref>
Access to safe drinking water is indicated by safe water sources. These improved drinking water sources include household connection, public standpipe, borehole condition, protected dug well, protected spring, and rain water collection. Sources that do not 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, such as connection to public sewer, connection to septic system, or a pit latrine with a slab or water seal.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
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 people still lack safe drinking water. Estimates suggest that at least 25% of improved sources contain fecal contamination<ref name="PLoS_Bain_2014">Template:Cite journal</ref> and an estimated 1.8 billion people globally use a source of drinking water that suffers from fecal contamination.<ref>Template:Cite journal</ref> The quality of these sources varies over time and often gets worse during the wet season.<ref>Template:Cite journal</ref> Continued efforts are needed to reduce urban-rural disparities and inequities associated with poverty; to dramatically increase safe drinking water 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.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
RegulationsEdit
{{#invoke:Labelled list hatnote|labelledList|Main article|Main articles|Main page|Main pages}} Guidelines for the assessment and improvement of service activities relating to drinking water have been published in the form of drinking water quality standards such as ISO 24510.<ref>ISO 24510 Activities relating to drinking water and wastewater services. Guidelines for the assessment and for the improvement of the service to users</ref>
European UnionEdit
For example, 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.<ref name="waterframework">Template:Cite journal</ref> This 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.
JapanEdit
To improve water quality, Japan's Ministry of Health revised its water quality standards, which were implemented in April 2004.<ref name=":2">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Numerous professionals developed the drinking water standards.<ref name=":2" /> They also determined ways to manage the high quality water system. In 2008, improved regulations were conducted to improve the water quality and reduce the risk of water contamination.<ref name=":2" />
New ZealandEdit
Template:See also The Water Services Act 2021 brought Taumata Arowai' into existence as the new regulator of drinking water and waste water treatment in New Zealand. Initial activities including the establishment of a national register of water suppliers and establishing a network of accredited laboratories for drinking water and waste water analysis<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
SingaporeEdit
Template:See also Singapore is a significant importer of water from neighbouring Malaysia but also has made great efforts to reclaim as much used water as possible to ensure adequate provision for the very crowded city-state. Their reclaimed water is marketed as NEWater. Singapore updated its water quality regulation in 2019, setting standards consistent with the WHO recommended standards. Monitoring is undertaken by the Environmental Public Health Department of the Singaporean Government<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
United KingdomEdit
Template:See also In the United Kingdom regulation of water supplies is a devolved matter to the Welsh and Scottish Parliaments and the Northern Ireland Assembly.
In England and Wales there are two water industry regulatory authorities.
- Water Services Regulation Authority (Ofwat) is the economic regulator of the water sector; it protects the interests of consumers by promoting effective competition and ensuring that water companies carry out their statutory functions. Ofwat has a management board comprising a chairman, Chief Executive and Executive and Non-Executive members. There is a staff of about 240.<ref>{{#invoke:citation/CS1|citation
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- The Drinking Water Inspectorate (DWI) provides independent assurance that the privatised water industry delivers safe, clean drinking water to consumers. The DWI was established in 1990 and comprises a Chief Inspector of Drinking Water and a team of about 40 people.<ref>{{#invoke:citation/CS1|citation
|CitationClass=web }}</ref> The current standards of water quality are defined in Statutory Instrument 2016 No. 614 the Water Supply (Water Quality) Regulations 2016.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
The functions and duties of the bodies are formally defined in the Water Industry Act 1991 (1991 c. 56) as amended by the Water Act 2003 (2003 c. 37) and the Water Act 2014 (2014 c. 21).<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
In Scotland water quality is the responsibility of independent Drinking Water Quality Regulator (DWQR).<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
In Northern Ireland the Drinking Water Inspectorate (DWI) regulates drinking water quality of public and private supplies.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> The current standards of water quality are defined in the Water Supply (Water Quality) Regulations (Northern Ireland) 2017.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
United StatesEdit
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HistoryEdit
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In drinking water access, quality and quantity are both important parameters but the quantity is often prioritized.<ref name=":03" /> Throughout human history, water quality has been a constant and ongoing challenge. Certain crises have led to major changes in knowledge, policy, and regulatory structures. The drivers of change can vary: the cholera epidemic in the 1850s in London led John Snow to further our understanding of waterborne diseases. However, London's sanitary revolution was driven by political motivations and social priorities before the science was accepted.<ref name=":03" />
See alsoEdit
- Boil-water advisory
- Human right to water and sanitation
- List of countries by access to clean water
- List of water supply and sanitation by country
- Water filter
- Water fluoridation
- Water intoxication
- Water security
ReferencesEdit
External linksEdit
Template:Sister project Template:Sister project Template:Sister project Template:Wikivoyage Template:Sister project Template:Scholia
- WHO fact sheet on drinking water
- WHO Guidelines for drinking-water quality (2022)
- Drinking Water - US Centers for Disease Control and Prevention. General info, data and publications.
- Ground water and drinking water - US Environmental Protection Agency. General info, regulations & technical publications.