Natural mineral water vs tap water: which is better?

Is tap water or mineral water better for you?

Both are healthy ways to stay hydrated. UK tap water is safe, closely regulated and much cheaper. Natural mineral water may contain more of some minerals, but there is no clear evidence that it is better for your health. The British Nutrition Foundation says we need about 6 to 8 cups or glasses of fluid a day, and water is one of the healthiest choices.

Is tap water safe to drink in the UK?

Yes. Tap water is tested regularly and must meet strict standards. In England and Wales, the Drinking Water Inspectorate provides independent reassurance that water supplies are safe. Scotland has the Drinking Water Quality Regulator, and Northern Ireland has its own Drinking Water Inspectorate.

Tap water can sometimes taste or smell different. The Drinking Water Inspectorate explains that you may notice a slight taste or smell of chlorine, which is used to keep water safe, and that household plumbing is the most common cause of unusual tastes. This is usually no cause for concern about safety.

Always drink from the cold tap. The Drinking Water Inspectorate says water from the hot tap is not recommended for drinking, because it can contain higher levels of metals such as copper.

What is natural mineral water?

Natural mineral water comes from a protected underground source and is bottled at the source. It keeps its natural minerals and can only have a few limited treatments. Each brand has its own mix of minerals, depending on the rocks the water passes through, which is why different brands can taste different. For more about bottled waters, read mineral water vs spring water.

Which minerals are in drinking water?

Both tap water and bottled water can contain minerals such as calcium, magnesium and sodium. The amounts vary depending on where the water comes from. Water with more calcium and magnesium is known as hard water. It can leave limescale in your kettle, and the Drinking Water Inspectorate notes there is only limited evidence of any link between water hardness and heart health.

Some water also contains fluoride. The UK Chief Medical Officers say appropriate levels of fluoride can reduce how common and how severe tooth decay is. Water gives you only a small part of the minerals you need. Most come from a balanced diet.

Should you filter tap water?

You do not need to. The Drinking Water Inspectorate says there is no need to install extra treatment in the home. Some people use a filter jug because they prefer the taste. If you do, follow the manufacturer's advice on how often to change the cartridge.

What about plastic bottles?

Most bottled water comes in plastic bottles, which create waste. Bottled water can also contain tiny pieces of plastic, called microplastics. The government's Committee on Toxicity has said it is not yet possible to fully assess the potential risks to health, so research is ongoing. A refillable bottle filled from the tap avoids both the waste and the question.

Which should you choose?

Choose whichever helps you drink enough. Tap water is safe, cheap and better for the environment. If you prefer the taste of mineral water, or need water when tap water is not available, it is a good alternative.