Drinking tap water in Belgium: safe?

Reading time: ~12 minutes

You're in a gîte in the Ardennes, an apartment in Antwerp, or a hotel in Brussels, you turn on the tap and hesitate for a moment: can this water go straight into your glass? It's one of the most frequently asked questions about Belgium, partly because Belgians themselves buy a remarkable amount of bottled water. This leads to a persistent misunderstanding, because according to the Flemish Institute for Healthy Living, tap water in Belgium is completely safe.

In this guide, you'll read how strictly Belgian tap water is controlled, what the situation is with PFAS and limescale, how it differs from Dutch tap water, and when it's smart to filter at home. All based on figures from the Flemish Environment Agency, AquaFlanders, and the water companies themselves, without scaremongering.

1. Can you drink tap water in Belgium?

Yes. Tap water in Belgium is safe to drink, for residents and tourists alike. From a tap in Ghent to a fountain in Brussels: you can confidently fill a glass of water from it, without boiling or treating. Brushing teeth, making ice cubes, and cooking with tap water can also be done anywhere in the country without worries.

The Flemish Environment Agency is concise about it: tap water is perfectly drinkable. The water is first pumped up from the ground or a river, then filtered and purified, and only then fed into the pipeline network. Those accustomed to Dutch tap water will notice no difference in terms of safety.

2. How safe is it? Standards and daily control

Tap water in Belgium is the most strictly controlled foodstuff you have in your home. According to the sector federation behind the #ikdrinkkraanwater campaign, it is checked on no fewer than 67 points. No bottle of spring water in the supermarket comes close to that frequency of control.

Water companies check tap water daily and are obliged to measure a fixed list of substances. This list is drawn up based on the recommendations of the World Health Organization. Think of bacteria, nitrates, pesticides, and heavy metals such as lead and copper.

With new testing methods, water companies are also looking for substances that are not yet included in the standard. For example, hormone-disrupting substances: according to the VMM, these have not yet been found in Flemish tap water. Do you want to know exactly what comes out of your tap? Request the water quality report for your supply area from your water company, or use the street list of De Watergroep if they serve your street.

3. PFAS in Belgian tap water: the real figures

Since the PFAS issues of recent years, this is the question that is most pressing. The honest answer from the Flemish Environment Agency: PFAS have permeated deep into the environment and are found in very low concentrations almost everywhere in Flemish tap water. The water does comply with the European standard, so these are very small amounts and there is no reason to stop drinking tap water.

What exactly are these standards? Since the revised European Drinking Water Directive, implemented into Flemish legislation in January 2023, the following applies:

• Sum of PFAS: a maximum of 100 nanograms per liter for the sum of 20 of the most relevant and most common PFAS.
• Total PFAS: a maximum of 500 nanograms per liter for the sum of all PFAS.
• Target value: EFSA recommended in 2020 a limit of 4 nanograms per liter for the sum of four compounds (PFOA, PFOS, PFNA, and PFHxS). Flanders adopted this as a precautionary target value, with the aim of achieving this concentration by 2028.

This target value is the real story behind the nuance: the standard is met, but science is lowering the bar. PFAS hardly break down and can accumulate in the body with repeated intake. Experts do assume that the amount of PFAS you ingest via Flemish tap water is limited compared to food.

If you want to bridge that last margin yourself, you filter at the point where you drink. On our page about a water filter against PFAS, we explain which filtering techniques demonstrably remove PFAS, and which do not. In short: a common filter jug does little, but a certified multi-stage under-sink filter does.

4. Water hardness in Belgium: how much limescale is in it?

This is where Belgians notice their tap water the most. In large parts of the country, the water is calcareous, and you can see this in your kettle, on your shower head, and in your coffee machine. Hardness is the sum of the calcium and magnesium present, and according to AquaFlanders, these are minerals that your health actually needs. Limescale is therefore not a health problem, but it is a comfort problem.

In Belgium, hardness is expressed in French degrees (°F). On appliances and in manuals, you sometimes see German degrees (°D). The conversion is simple: 1 °F is 0.56 °D, and one French degree represents 4 milligrams of calcium per liter.

Above 30 °F, meaning hard to very hard water, real comfort problems can arise. Limescale primarily precipitates when water is heated above 55 °C or when it comes into contact with air, for example, at the showerhead. Limescale in your boiler means higher energy consumption, and with a dishwasher or washing machine, you lose efficiency. More about the approach can be found in our guide on filtering limescale from your tap water.

Be careful with the classic solution. A water softener lowers the hardness but replaces calcium and magnesium with sodium. As a result, the water may not be suitable for people on a low-sodium diet, according to AquaFlanders, and without annual maintenance, bacteria can develop in the device. If water companies soften the water themselves, a minimum residual hardness of 10 °F must remain: completely limescale-free water does not exist in the pipeline network. We compare the options in water softener or water filter.

5. Tap water Belgium vs. the Netherlands

Both countries supply safe drinking water that must comply with the same European directive. The difference mainly lies in hardness and how centrally purification is regulated.

In the Netherlands, the hardness of tap water is around 8 °D, which amounts to soft to medium-hard. Water harder than 18 °D does not occur, because the drinking water companies centrally soften water in almost all areas. By law, Dutch drinking water must maintain at least 5.6 °D, unless it is naturally softer.

In Belgium, the situation is more mixed. There is no maximum water hardness stipulated, and the hardness varies greatly by supply area and even by street. In limestone-rich areas, the hardness is therefore higher than what a Dutch person is used to. This is why the complaint "my tap is full of limescale within a week" is heard more often in Belgium than across the border. For comparison: how this works out in the Netherlands, we describe in hard water in the Netherlands and per city in our analysis of tap water quality in Amsterdam.

6. Chlorine smell, brown water, and lead pipes

Three things that often startle Belgian tap water drinkers, and what you should really do about them.

Chlorine smell

Sometimes a small amount of chlorine is added to keep the water in the pipes clean. The VMM calls the chlorine smell unpleasant but harmless: let the water sit in a carafe or uncapped bottle for a while, and the smell will disappear on its own. If a pungent smell lingers that doesn't go away, call your water company. If you want to permanently remove the taste, read our explanation on filtering chlorine from tap water.

Brown or reddish-brown water

If brownish water comes out of a tap that hasn't been used for a while, it usually contains some rust or iron. Let the tap run for a moment, and it will become clear again on its own. If it keeps coming back, the cause is often structural; we describe the approach in filtering iron from tap water.

Lead pipes in old buildings

This is the most important point of attention in this entire guide. Many old Belgian buildings still have lead water pipes, and lead is toxic: especially young children get sick from it. The VMM advises replacing these pipes. If you live in an old building or rent a holiday home, let the tap run briefly in the morning until the water is cold, so that standing water is flushed out. Those who want to tackle lead permanently at the source can install a certified filter; see filtering lead from tap water.

7. Why do Belgians buy so much bottled water?

If tap water is so good, why are Belgian supermarkets full of cases of water? Because it's a habit, not a safety issue. Belgium is among the countries with the highest bottled water consumption worldwide, with 131.7 litres per person per year.

That costs money. If you switch from bottled water to tap water for just 1 litre per day, according to the same source, you save approximately 320 euros per year. For a family of four, this quickly adds up, even before you consider the hassle of carrying cases and the plastic waste. We've explained how this calculation works out if you filter tap water instead of buying bottles in tap water vs. bottled water.

8. Comparison table: tap, bottle, jug or filter

Four ways to get drinking water in Belgium, side by side.

The difference between a jug and an inline system lies primarily in certification and convenience. A filter jug improves taste but is rarely tested for substances like PFAS or lead. An under-sink filter is permanently connected to the cold water line and provides filtered water from your existing tap. Which variant suits which household is outlined in our guide to the best water filter and in our review of the best under-sink water filter.

9. When is home filtering in Belgium useful?

If you're traveling for a few days, you don't need a filter: Belgian tap water is fine. Filtering becomes interesting if you live there and drink from that tap daily. At PureFilter, we see that Belgian customers primarily choose an under-sink filter for three reasons.

• Hard water: in areas with hard water above 30 °F, limescale is visible, and the taste is chalky. Filtration makes the water softer and fresher without de-salting it with sodium.
• Micro-contaminants: now that Flanders' target value for PFAS is set to 4 nanograms per liter, people don't want to wait until 2028 to achieve lower levels themselves.
• Old pipes: in buildings with potentially lead or copper internal pipes, a certified system filters out lead at the last point before your glass.

The PureFilter Mineral+ is built for this. This five-stage under-sink filter removes more than 100 contaminants, including PFAS, microplastics, heavy metals such as lead and copper, fluoride, nitrates, medicine residues, and chlorine, and is certified to NSF 42, 53, 61, and 372. Unique is the second step: via Swedish Mineral Rock™ it adds back calcium, magnesium, and potassium, so the water does not become flat as with reverse osmosis. If you are looking for a complete overview of what is available for households, please see our selection of water filters for home.

Practical for Belgian orders: installation takes 5 to 10 minutes and does not require a plumber or tools. Delivery to Belgium takes an average of 2 to 4 working days after dispatch, you can pay with Bancontact, and you have 40 days free returns plus 5 years warranty. A replacement filter costs 49.90 euros and lasts up to 12 months, which amounts to approximately 0.14 euros per day.

10. Tap water with a baby and on holiday in the Ardennes

Two situations where the question arises particularly often.

Preparing baby formula with Belgian tap water

Tap water in Belgium is generally suitable for baby formula, as it meets the same strict standards as all drinking water. The points of concern are in the home, not in the network: always use cold water from the cold tap, let the tap run briefly after a night of stagnation, and be extra careful in buildings where lead pipes may still be present. Never use hot water from the hot tap; we explain why in drinking hot tap water. More about the choice of water for bottle feeding can be found in our guide on a water filter for baby formula.

The Ardennes, gîtes and second circuit

Even in the Ardennes, controlled tap water comes from the tap. One thing to look out for in holiday homes and old rural properties: sometimes there is a second circuit with rainwater or well water for the toilet or garden. This water is not drinking water. If in doubt, check for a label near the tap and ask the landlord. If a property has been vacant for a long time, let all taps run for a few minutes upon arrival; this flushes stagnant water from the pipes.

11. Frequently asked questions about tap water in Belgium

12. Conclusion

Drinking tap water in Belgium is worry-free. It is checked at 67 points daily, PFAS concentrations remain below the European standard of 100 nanograms per litre, and the VMM calls the water perfectly drinkable. For tourists, there is no reason to buy bottles: just refill your bottle at the tap.

If you live in Belgium, there are two practical reasons to look further. The water in many regions is hard without a legal maximum, and the target value for PFAS is moving towards 4 nanograms per litre by 2028. If you want softer, mineral-rich, and purer water from your own tap now, a certified under-sink filter is the most convenient solution. Check out the PureFilter Mineral+, compare options on best water filter, or read our frequently asked questions.