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Is tap water safe to drink in the UK? – Patient.info

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We drink it every day, and sometimes we swim in it. Access to clean water is a fundamental human right, but growing concerns over sewage pollution have shone a spotlight on UK water. From impurities in drinking water to pollutants in our rivers and seas, we find out how the UK cleans up.
In part 1 of this series, we start in the home and explore the potential safety concerns of our tap water.
You’ve likely been told to drink plenty of water. This life-sustaining liquid fuels our bodies and minds and helps prevent many health problems. Without it, the average person would die within three days. Yet, water can also carry substances that harm us and make us ill. To prevent this, authorities treat water before it can be drunk and manage common pollutants.
Nutritionist Gabi Zaromskyte helps us explore drinking water safety here in part 1 of our UK water quality series. In part 2, we travel out the home and into our rivers and seas to discover the state of water pollution.
The UK has stringent water quality standards to protect your safety, and your tap water is filtered of toxins in treatment plants before it reaches your home. This doesn’t totally get rid of all impurities in the water – but the amounts left in are generally considered safe in the UK.
In fact, the UK is one of only six nations worldwide to achieve the maximum score possible for drinking water sanitation in the 2022 Environmental Performance Index1.
When it reaches our homes, nutritionist Gabi explains that water can still carry:
To insert graphic image of glass of blue water with arrows of above four labels.
UK tap water shouldn’t make you ill because harmful levels of toxins have been filtered out before it reaches your taps. However, domestic water filters claim to remove many of the remaining impurities and improve taste.
The levels of both beneficial and un-beneficial substances in your water will depend on where you live. Also, different filters have different functions – no single water filter can get rid of every type of contaminant. It’s also worth noting that water filters can remove minerals that are good for you, like calcium, magnesium, and fluoride which support healthy bones and teeth2.
The World Health Organization (WHO) have rated a range of water filter brands based on how good they are at keeping out bacteria. You can find this handy guide here.
Water filters could help people with sensitivities to chlorine or who have weakened immune systems and are therefore more vulnerable to the effects of bad bacteria.
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“The choice between hard and soft water largely depends on personal preference and regional water quality,” says Gabi. “Both types are generally safe for consumption, and for most people any potential health effects are relatively minor.”
The hardness or softness of water depends on its mineral content. Gabi says: “Hard water contains higher levels of essential minerals like calcium and magnesium, which contribute to your daily mineral intake. Soft water has a lower mineral content and tends to have higher concentrations of salt.”
From a dietary perspective, this makes hard water slightly healthier, but if you eat enough calcium and magnesium through a healthy diet, the levels in your water are unlikely to make a difference.
However, if you are more vulnerable to heart related diseases like high blood pressure, there’s some evidence that living in regions with hard water may offer some protection4. It’s thought that this might be because soft water contains more salt and causes more stiffness in your arteries5. More robust research is needed, and your diet and lifestyle are considered to be by far the most important factors for heart health.
There’s a great deal of interest in the potential link between nitrates in drinking water and bowel cancer risk – but more research is needed.
“Nitrates are chemical compounds that can be found in groundwater and surface water due to agricultural runoff, sewage contamination, and other sources,” says Gabi. “Our bodies convert nitrates to nitrites, which can lead to the formation of nitrosamines in the gut.”
Nitrosamines are common in both food and water, but some experts believe that high levels caused by prolonged nitrate exposure may increase a person’s cancer risk. One study in New Zealand suggested that high levels of nitrates in drinking water may be contributing to their national cases of bowel cancer6.
So how much nitrate in our drinking water is too much? The UK standard is based on WHO’s guidance for safe nitrate levels, which is up to 50 mg per litre7. Drinking levels below 50mg/L do not appear to cause common health problems associated with ingesting toxins, including thyroid problems and infant methemoglobinemia – a very rare condition where toxins lower blood oxygen levels in babies. Critics, however, argue that these guidelines don’t take long-term cancer risk into account6.
“Nonetheless, it’s important to know that the potential risk appears to be associated with long-term exposure to high levels of nitrates,” Gabi adds. “Moreover, bowel cancer is a complex disease influenced by multiple factors, including genetics, diet, lifestyle, and other environmental exposures.” It”s therefore difficult to know the effects of drinking water nitrates in isolation.
It’s good to know about the trace toxins in our tap water, but bear in mind that UK tap water is considered to be among the most sanitised and safe in the world. Further research into the potential toxic affect of nitrates and other substances, at certain levels, can help to maintain or improve our water quality standard in the future.
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Disclaimer: This article is for information only and should not be used for the diagnosis or treatment of medical conditions. Egton Medical Information Systems Limited has used all reasonable care in compiling the information but make no warranty as to its accuracy. Consult a doctor or other health care professional for diagnosis and treatment of medical conditions. For details see our conditions.
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Our clinical information meets the standards set by the NHS in their Standard for Creating Health Content guidance. Read our editorial policy.
Patient aims to help the world proactively manage its healthcare, supplying evidence-based information on a wide range of medical and health topics to patients and health professionals.
Our clinical information meets the standards set by the NHS in their Standard for Creating Health Content guidance. Read our editorial policy.
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