What Is Seltzer Water? A Refreshing Guide for UK Drinkers

Seltzer water is having a real moment in the UK. From trendy cafes in London to supermarket shelves up and down the country, it’s everywhere. But what is seltzer water exactly? Is it just another name for sparkling water? And how does it differ from soda water or tonic? If you’re a bit fizzled out by all the bubbly terminology, don’t worry — you’re not alone.

In this guide, we’ll break down what seltzer water is, its origins, health benefits, how it compares with other carbonated waters, and how it fits into UK drinking culture. Whether you’re curious about switching to a healthier fizzy option or just want to sound clever in the pub, we’ve got you covered.

Seltzer water is plain water that has been carbonated, meaning carbon dioxide gas has been added under pressure to give it that fizzy, bubbly texture. Unlike tonic water or soda water, seltzer water contains no added minerals or sweeteners. It’s simply fizzy water — clean, crisp, and refreshing.

While the word “seltzer” might sound a bit American, the product itself is pretty universal and increasingly popular in the UK.

The term “seltzer” comes from the German town of Selters, known for its natural mineral springs. Back in the 18th century, water from this region was so famously fizzy and pure that it was bottled and exported across Europe. Eventually, the word “Selters” became “seltzer” in English, especially in the United States, where the term stuck.

Today, most seltzer water is artificially carbonated, but the name has lived on.

Here’s where it can get confusing. Let’s set the record straight with a simple breakdown:

So if you’re just after pure, fizzy hydration, seltzer is your best bet. No minerals, no sugar, no nonsense.

Let’s be honest — the UK has long loved its fizzy drinks. But as awareness of s ugar intake and calorie consumption rises, many are looking for healthier alternatives. Enter seltzer water: fizzy, fun, and totally guilt-free.

Seltzer water contains zero calories, zero sugar, and no artificial flavorings (unless you opt for flavoured versions). It’s a solid swap for those looking to cut down on soft drinks without sacrificing bubbles.

In the UK’s booming cocktail scene, seltzer water has become a bartender’s best friend. It adds fizz without overpowering a drink’s core flavors, making it perfect for mocktails, spritzes, and light cocktails.

Although still a bit of a niche in the UK, hard seltzers — alcoholic seltzer water — are gaining traction. Popular in the US, they’re now creeping into British supermarkets and off-licences, offering a low-calorie alcoholic option for health-savvy drinkers.

Good news: yes, it is — generally speaking. Here’s why:

Seltzer water is just water with bubbles. If you’re someone who struggles to drink enough plain water, switching to seltzer could make hydration more enjoyable.

Unlike sugary fizzy drinks, seltzer water doesn’t cause tooth decay. That said, it is slightly acidic due to the carbonation process. According to the British Dental Journal , it’s still much better for your teeth than cola or juice — just don’t swish it around like mouthwash.

Some studies suggest that carbonated water can help with satiety, meaning you feel fuller after drinking it. This can be useful if you’re managing your weight or trying to avoid unnecessary snacking.

There’s a growing selection of flavoured seltzer waters available in UK supermarkets — think lemon, lime, raspberry, cucumber, and more. These usually contain natural flavors and remain sugar-free and calorie-free.

However, always check the label. Some brands sneak in sweeteners or additives, which might not align with your health goals.

For most people, seltzer water is completely safe. But here are a couple of things to be aware of:

• Bloating or gas: The bubbles can cause a bit of bloating for some people.
• Acidity: While not as harsh as colas or citrus juices, seltzer water is slightly acidic. If you have acid reflux or sensitive teeth, go easy on it.
• Confusing labels: Not all fizzy water is created equal. Always check whether it’s seltzer, soda water, or tonic.

If you’re looking for a healthy, fizzy alternative to sugary drinks, seltzer water is a no-brainer. It’s refreshing, affordable, and increasingly available across the UK. Whether you drink it plain, mix it into cocktails, or use it in the kitchen, seltzer is more than a trend — it’s a lifestyle upgrade.