Drinking tap water in Belgium: safe?

Reading time: ~12 minutes

You are standing in a gîte in the Ardennes, a flat in Antwerp or a hotel in Brussels, you turn on the tap and pause for a moment: can this water go straight into your glass? It is one of the most frequently asked questions about Belgium, partly because Belgians themselves buy a striking amount of bottled water. That feeds a persistent misunderstanding, because according to the Vlaams Instituut Gezond Leven (the Flemish institute for healthy living), tap water in Belgium is perfectly safe.

In this guide you will read how strictly Belgian tap water is monitored, how things stand with PFAS and limescale, where it differs from Dutch tap water, and when it makes sense to filter at home. All based on figures from the Vlaamse Milieumaatschappij, AquaFlanders and the water utilities themselves, without scaremongering.

1. Can you drink tap water in Belgium?

Yes. Tap water in Belgium is safe to drink, for residents and visitors alike. From a tap in Ghent to a fountain in Brussels: you can pour yourself a glass with complete confidence, without boiling or treating it. Brushing your teeth, making ice cubes and cooking with tap water are equally worry-free anywhere in the country.

The Vlaamse Milieumaatschappij puts it succinctly: tap water is perfectly drinkable. The water is first abstracted from the ground or from a river, then filtered and purified, and only then sent into the mains network. If you are used to Dutch tap water, you will notice no difference in terms of safety.

2. How safe is it? Standards and daily monitoring

In Belgium, tap water is the most strictly monitored foodstuff you have in the house. According to the sector federation behind the #ikdrinkkraanwater campaign, it is checked against no fewer than 67 parameters. Not a single bottle of spring water in the supermarket comes close to that monitoring frequency.

The water utilities check tap water every day and are required to measure a fixed list of substances. That list is drawn up on the basis of World Health Organization recommendations. Think of bacteria, nitrate, pesticides and heavy metals such as lead and copper.

With new testing methods, the water utilities also look for substances that are not yet covered by the standard. Endocrine disruptors, for example: according to the VMM, these have not yet been found in Flemish tap water. Would you like to know exactly what comes out of your tap? Request the water quality report for your supply area from your water utility, or use the street list from De Watergroep if it serves your street.

3. PFAS in Belgian tap water: the real figures

Since the PFAS cases of recent years, this is the question that comes up most. The honest answer from the Vlaamse Milieumaatschappij: PFAS have penetrated deep into the environment and are found in very low concentrations in almost all Flemish tap water. The water does meet the European limit, so these are very small quantities and there is no reason to stop drinking tap water.

What exactly are those limits? Since the revised European Drinking Water Directive, transposed into Flemish law in January 2023, the following applies:

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

That target value is the real story behind the nuance: the standard is being met, but the science is moving the bar downwards. PFAS barely break down and can accumulate in the body with repeated intake. Experts do assume that the amount of PFAS you take in through Flemish tap water is limited compared with food.

If you want to close that last margin yourself, you filter at the point where you drink. On our page about a water filter for PFAS we explain which filter technologies demonstrably remove PFAS, and which do not. In short: an ordinary filter jug does little, whereas 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 most. In large parts of the country the water is high in limescale, and you see that in the kettle, on the shower head and in your coffee machine. Hardness is the sum of the calcium and magnesium present, and according to AquaFlanders those are minerals your health actually needs. Limescale is therefore not a health issue, but it is a comfort issue.

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

Above 30 °fH, so hard to very hard water, genuine comfort problems can arise. Limescale precipitates mainly when you heat water above 55 °C or when it comes into contact with air, at the shower head for instance. Limescale in your boiler means higher energy use, and in a dishwasher or washing machine you lose efficiency. You can read more about how to tackle it in our guide to filtering limescale out of your tap water.

Be careful with the classic solution. A water softener lowers the hardness, but replaces calcium and magnesium with sodium. According to AquaFlanders, that may make the water unsuitable for people on a low-salt diet, and without annual maintenance bacteria can develop inside the unit. Where water utilities soften the water themselves, a minimum residual hardness of 10 °fH must remain: completely limescale-free water does not exist in the mains network. We compare the options in water softener or water filter.

5. Belgian vs Dutch tap water

Both countries supply safe drinking water that has to meet the same European directive. The difference lies mainly in hardness and in how centrally the treatment is arranged.

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

In Belgium the picture is more mixed. There is no maximum water hardness laid down, and hardness varies strongly by supply area and even by street. In limestone-rich areas, hardness therefore climbs higher than a Dutch resident is used to. That 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: we describe how this plays out in the Netherlands in hard water in the Netherlands, and city by city in our analysis of tap water quality in Amsterdam.

6. Chlorine smell, brown water and lead pipes

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

Chlorine smell

A small amount of chlorine is sometimes added to keep the water clean while it travels through the pipes. The VMM calls a chlorine smell unpleasant but harmless: let the water stand for a while in a carafe or an uncapped bottle and the smell disappears by itself. If a sharp smell lingers and does not go away, call your water utility. If you would like to remove the taste permanently, read our explanation of filtering chlorine out of tap water.

Brown or reddish-brown water

If brownish water comes out of a tap that has not been used for a while, there is usually some rust or iron in the water. Let the tap run for a moment and it will clear by itself. If it keeps coming back, the cause is often structural; we describe the approach in filtering iron out of tap water.

Lead pipes in older properties

This is the most important point of attention in this entire guide. Plenty of older Belgian buildings still have lead water pipes, and lead is toxic: young children in particular are affected by it. The VMM advises replacing those pipes. If you live in an older property or are renting a holiday home, let the tap run briefly in the morning until the water is cold, so that standing water is flushed away. If you want to tackle lead permanently at the source, you can fit a certified filter; see filtering lead out of tap water.

7. Why do Belgians buy so much bottled water?

If the tap water is so good, why are Belgian supermarkets full of crates of water? Because it is a habit, not a safety matter. Belgium is among the countries with the highest bottled water consumption in the world, at 131.7 litres per person per year.

That costs money. If you switch just 1 litre a day from bottled water to tap water, the same source says you save roughly 320 euros a year. For a family of four that adds up quickly, before you even count the lugging of crates and the plastic waste. We have worked out how the sums look when 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, set side by side.

The difference between a jug and an inline system lies mainly in certification and convenience. A filter jug improves the taste, but is rarely tested for substances such as PFAS or lead. An under-sink filter sits permanently on the cold water line and delivers filtered water from your existing tap. We set out which type suits which household on best water filter and in our test of the best under-sink water filter.

9. When is filtering at home worthwhile in Belgium?

If you are travelling for a few days, you do not need a filter: Belgian tap water is fine. Filtering becomes interesting when you live there and drink from that tap every day; our water filter guide helps you work out which water filter you need. At PureFilter we see Belgian customers choosing an under-sink filter for three reasons above all.

• Water high in limescale: in areas with hard water above 30 °fH the deposits are visible and the taste is chalky. Filtration makes the water softer and fresher without desalinating it with sodium.
• Micropollutants: now that the Flemish target value for PFAS is heading towards 4 nanograms per litre, people do not want to wait until 2028 to get below it themselves.
• Older pipework: in properties that may have lead or copper internal pipes, a certified system filters out lead at the very last point before your glass.

The PureFilter Mineral+ is built for exactly that. This five-stage under-sink filter removes more than 100 contaminants, including PFAS, microplastics, heavy metals such as lead and copper, fluoride, nitrates, pharmaceutical residues and chlorine, and is certified to NSF 42, 53, 61 and 372. The second stage is what sets it apart: via Swedish Mineral Rock™ it adds calcium, magnesium and potassium back in, so the water does not turn flat as it does with reverse osmosis. If you would like a complete overview of what is available for households, take a look at our selection of a water filter for the home.

Practical notes for Belgian orders: installation takes 5 to 10 minutes and needs no plumber or tools. Delivery to Belgium takes 2 to 4 working days on average after dispatch, you can pay with Bancontact, and you have 40 days of free returns plus a 5-year warranty. A replacement filter costs 65.00 euros and lasts up to 12 months, which works out at less than one cent per litre.

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

Two situations in which the question comes up especially often.

Preparing baby formula with Belgian tap water

In principle, tap water in Belgium is suitable for baby formula, because it meets the same strict standards as all drinking water. The points of attention are in the property, not in the network: always use cold water from the cold tap, let the tap run briefly first after a night of standing, and take extra care in properties where lead pipes may still be present. Never use hot water from the hot tap; we explain why in drinking hot tap water. There is more on choosing water for bottle feeding in our guide to a water filter for baby formula.

The Ardennes, gîtes and second circuits

In the Ardennes too, what comes out of the tap is simply monitored mains water. One thing to watch for in holiday homes and older rural properties: there is sometimes a second circuit with rainwater or well water for the toilet or the garden. That water is not drinking water. If in doubt, check whether there is a label by the tap and ask the owner. If a property has stood empty for a long time, run all the taps for a few minutes on arrival; that flushes standing water out of the pipes.

11. Frequently asked questions about tap water in Belgium

12. Conclusion

You can drink tap water in Belgium without worry. It is checked against 67 parameters and monitored daily, PFAS concentrations stay below the European limit of 100 nanograms per litre, and the VMM calls the water perfectly drinkable. For visitors there is no reason at all to buy bottles: simply refill your bottle at the tap.

If you live in Belgium, there are two practical reasons to look further. In many regions the water is high in limescale with no legal maximum, and the target value for PFAS is heading towards 4 nanograms per litre by 2028. If you would like softer, mineral-rich and purer water from your own tap today, a certified under-sink filter is the calmest solution. Take a look at the PureFilter Mineral+, compare the options on best water filter, or read our frequently asked questions.