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Is London Tap Water Safe to Drink? Unveiling the Truth

The safety of tap water has been a topic of debate for many. In this article, we aim to answer the question: Is tap water safe to drink in London? Let’s delve into the guidelines from reputable sources, explore the state of London’s tap water, and examine recent research to better understand the potential health concerns associated with consuming tap water.

Health Guidelines and Water Distillation

The European Food Safety Authority and the NHS recommend an average daily fluid intake of 1.6-2.5 liters. For simplicity, let’s consider a target of 2 liters per day, which amounts to 8 liters every 4 days.

A water distiller can produce 8 liters of distilled water in 2 cycles, removing 99.9% of impurities. This method allows you to witness what was present in the water before distillation. The results may be shocking. Sediments, such as yellowish color and sediment at the bottom, are left behind after distilling 8 liters of London tap water.

Quality of London Tap Water

According to, the answer to whether you can drink tap water in the UK is a resounding yes. British tap water is highly regulated, with millions of tests conducted annually to ensure the best quality for consumers. Despite this assurance, residues found after distillation raise concerns about the tap water’s purity.

Recent Research into London Tap Water

In recent years, researchers have focused on evaluating the quality of London’s tap water. Some studies have reported traces of pharmaceuticals, pesticides, and other contaminants in the water supply. While the concentrations of these substances are typically low and fall within safety guidelines, their mere presence raises questions about the long-term effects of consuming tap water.

One study conducted by King’s College London in collaboration with the London School of Hygiene and Tropical Medicine analyzed the occurrence of pharmaceuticals in tap water. The research identified various compounds from medications, such as anti-inflammatories, antiepileptics, and antibiotics. Although the concentrations were below the safe limit set by regulatory bodies, the potential cumulative effect of chronic exposure to these substances remains a subject of ongoing investigation.

Possible Health Concerns About Drinking Tap Water

Apart from pharmaceutical residues, tap water may contain other impurities that raise health concerns. For instance, London’s aging water infrastructure can lead to the leaching of heavy metals like lead and copper into the water supply. Long-term exposure to these metals can have adverse effects on health, particularly for vulnerable populations such as children and pregnant women.

Moreover, chlorination, a common water treatment method, can create disinfection by-products (DBPs) when reacting with organic matter. Some of these DBPs, such as trihalomethanes and haloacetic acids, have been linked to an increased risk of certain cancers and reproductive issues.

Distilled Water for Health

Given the potential concerns surrounding tap water, water distillation has gained popularity as a method to ensure water purity. Distillation effectively removes contaminants, including pharmaceutical residues, heavy metals, and chlorine by-products. Drinking distilled water can provide peace of mind and reduce the risk of ingesting potentially harmful substances.


While authorities assert the safety of London’s tap water, recent research highlights the presence of pharmaceutical residues and other impurities. Although the concentrations of these substances are generally within safety limits, the long-term effects of chronic exposure are still being investigated. Concerns about heavy metals and chlorine by-products further warrant consideration.

Water distillation remains a reliable method to obtain pure and contaminant-free water. Individuals concerned about potential health risks can opt for distilled water to ensure a safer hydration choice. Ultimately, the decision to drink tap water or choose distilled water lies with the consumer, who must weigh the factors and make an informed choice.


  1. European Food Safety Authority
  2. NHS – Adequate Daily Fluid Intakes
  3. – Can I Drink Tap Water in the UK?
  4. King’s College London – Occurrence of Pharmaceuticals in Tap Water
  5. US EPA – Lead and Copper in Drinking Water
  6. American Cancer Society – Disinfection By-products and Cancer Risk
  7. Nature – EU Proposal to Reduce Ethinyl Estradiol Levels in Water
  8. Water Distillers – A Comprehensive Guide