PFAS in Dutch tap water: what the 2026 findings mean for you

On 22 September 2026, the Netherlands found out what was in its tap water, postcode by postcode. Greenpeace Netherlands combined public measurements from all ten drinking water companies, covering 183 extraction points, and published the result: just over a third of the population drinks water that exceeds RIVM's health advice for PFAS.

NRC, NH Nieuws, DutchNews and NL Times all ran the story the same day. One week later, RIVM published a second piece of news: 71% of Dutch adults have more PFAS in their blood than the health-based limit.

Below we go through what the 2026 figures actually say, which areas are most affected, what the law requires, and what you can sensibly do at home. Every number comes from a source published or confirmed in 2026, listed at the end.

What are PFAS? A short recap

PFAS are a family of thousands of synthetic chemicals used in non-stick pans, waterproof clothing, food packaging, firefighting foam and some pesticides. They are called "forever chemicals" because they barely break down in nature. Once they reach rivers, soil or groundwater, they stay there for decades.

We covered the science in detail in PFAS in European Tap Water: What You Need to Know. This article focuses on the Netherlands.

How much PFAS is in Dutch tap water?

RIVM advises a maximum of 4.4 nanograms of PFAS per litre of drinking water. That figure is calculated by weighting each PFAS by how toxic it is, and Greenpeace used the same method for its analysis. Here are the ten municipalities with the highest levels:

Source: Greenpeace Netherlands, 22 September 2026, based on public data from the ten Dutch water companies. The "times RIVM advice" column is our own calculation against 4.4 ng/L.

According to DutchNews, Zaandam, Purmerend and IJmuiden all recorded 14.3 ng/L, and in 32% of the country's areas the level is at least one and a half times the advice. Drenthe, Friesland and Groningen, on the other hand, show almost no PFAS in their drinking water.

Want to check your own address? Greenpeace launched a postcode check based on the same data. Your water company also publishes its measurements.

Why the west is worse than the north

It comes down to where the water comes from. The north mostly pumps up groundwater, while the big cities in the west rely heavily on rivers and lakes. "Ground water contains less pollution than surface water," Patricia van der Linden of Vewin, the association of Dutch drinking water companies, told DutchNews. "In places where we use surface water for drinking water, we have to take more steps to purify the water."

About 40% of Dutch drinking water comes from surface water, mainly the Rhine and the Meuse. Much of the pollution enters those rivers before they even reach the Netherlands. "That is where things go wrong, largely before the river flows into the Netherlands at all," Koen Zuurbier of PWN told NH Nieuws. PWN is now building an extra installation at its Heemskerk plant to filter out more PFAS.

The problem will not go away quickly. In June 2026, RIVM calculated that PFAS will stay in Rhine and Meuse water for around 30 years, even if the EU bans the whole group. Under weaker rules, that becomes 40 years.

There are local sources too. In September, the regional environmental agency classed 2.7 million cubic metres of groundwater around the Chemours plant in Dordrecht as seriously contaminated, an area the size of about 25 football pitches. And farming adds its own share: the Dutch inspectorate ILT estimates that PFAS pesticides release at least 21,000 kg of TFA, a small and very mobile PFAS, into the environment every year. The pesticide regulator Ctgb is reviewing 46 of these products, calling the situation "a runaway train coming toward Dutch agriculture".

What Dutch and EU rules say

Two different numbers are doing the rounds, and they are easy to confuse.

In short, Dutch tap water is legal everywhere, but in large parts of the west it does not meet the country's own health advice. That gap is why water companies are investing in extra treatment, and why they and Greenpeace both want action at the source rather than at the tap.

The Netherlands is one of the countries behind a proposal to ban the entire PFAS group under EU chemicals law. RIVM spokesperson Coen Berends told NRC: "We can see that banning individual types of PFAS makes a difference, but really the whole group should be banned."

Dutch households agree on who should pay. In an AVROTROS Radar poll of 832 people in April 2026, 97% said the industries that discharge PFAS should fund the extra filtering, and 89% wanted to know exactly how much PFAS comes out of their own tap.

Why health experts are paying attention

PFAS build up in the body over the years. RIVM lowered its drinking water advice after new evidence showed PFAS affect the immune system more than previously thought, and long-term exposure has also been linked to cancer, fertility problems and harm to unborn babies.

On 29 September 2026, RIVM and the blood bank Sanquin published new measurements from 967 blood donors. The findings:

• 71% of Dutch adults have more PFAS in their blood than the health-based limit. In blood from 2016 and 2017, almost everyone did.
• PFOS was found at the highest levels, followed by PFOA.
• In Zeeuws-Vlaanderen, measured for the first time, PFOS and PFHpS were up to seven times higher than in the rest of the country.
• Around Dordrecht, PFOA was slightly elevated.

The drop is good news, and RIVM links it to the EU bans on PFOS and PFOA. RIVM researcher Joke Herremans said a ban "seems to work", while adding that it is too early to call it a lasting trend.

It is also worth keeping drinking water in proportion. RIVM says people in the Netherlands take in PFAS mainly through food and drinking water, and food accounts for more than three times as much as tap water. Near known sources, food grown or raised at home can carry more: in March 2026, RIVM confirmed that worms picked up by backyard chickens are a major source of PFAS in home-laid eggs.

What you can do at home

None of this calls for panic, but there are a few sensible steps:

• Check your area. Use the Greenpeace postcode check or look up your water company's published measurements.
• Don't switch to bottled water. RIVM and Vewin both advise against it. Tap water still meets the legal limit everywhere, and bottled water brings its own problem: plastic.
• Follow local food advice. If you live near a known PFAS source such as Chemours or the Westerschelde, check your municipality's advice on home-grown vegetables, home-laid eggs and self-caught fish.
• Eat a varied diet. Since food is the biggest source, variety spreads the risk.
• Don't boil it away. Boiling does not remove PFAS. It evaporates water and leaves the chemicals behind.
• If you use a filter, maintain it. In October 2026, the Consumentenbond warned about hundreds of filter adverts making unsupported PFAS claims. Experts also warn that a neglected filter can grow bacteria and even release substances it captured earlier. Replace parts on schedule (here is how to maintain an Ecofiltro), and look for brands that publish independent lab reports, not just promises.

Where Ecofiltro stands

As the Consumentenbond put it, the fears about PFAS are understandable, but some companies are exploiting them. We would rather give you the facts and let you decide.

Ecofiltro is a ceramic gravity filter that works without electricity and without plastic bottles. Our filters have been tested by independent laboratories, including the ISO/IEC 17025 accredited Measurlabs in Helsinki, and we publish the reports with the substances tested, the test conditions and the measured results, so you can read them for yourself rather than take our word for it.

The bottom line

Dutch tap water is legal and, according to RIVM, safe to drink. But in 2026 the data made it clear that a third of the country drinks water above its own health advice, mostly in the west, and that the pollution will take decades to clear from the rivers. The real fix lies at the source: bans, stricter discharge permits and polluters paying for the clean-up. Until then, knowing what is in your own glass is the best place to start.