When it comes to tap water safety, Europe is a continent of stark contrasts. While Nordic countries and several Western European states boast some of the cleanest drinking water on the planet, significant portions of the EU's groundwater remain contaminated with harmful chemicals, according to the latest data from the European Environment Agency and the Water Atlas compiled by the Heinrich Böll Foundation.
More than 20% of groundwater across the bloc is classified as being in poor chemical status, meaning levels of substances such as mercury, cadmium, and nitrates exceed limits set by the EU Water Framework Directive. The social and economic costs are enormous: treating nitrates alone—often originating from agricultural fertilisers—costs the EU an estimated €320 billion annually. The EU's legal limit for nitrates is 50 milligrams per litre, yet 14% of Europe's groundwater monitoring stations have recorded levels above that threshold.
Who Has the Safest Tap Water?
Despite these challenges, Europe's heavy investment in water sanitation has paid off. According to the Environmental Performance Index, 19 of the world's top 20 countries for sanitation and drinking water quality are European, with Japan as the sole non-European exception. Finland, Iceland, the Netherlands, Norway, Switzerland, and the United Kingdom each achieved a perfect score of 100 for protecting human health from unsafe drinking water and sanitation.
At the other end of the spectrum, the worst rates on the continent were found in Moldova (50 points), Georgia (51.7), and Albania (54.1). Three EU member states also ranked among Europe's ten lowest: Latvia (59.10), Lithuania (58.40), and Romania (56). These scores highlight persistent infrastructure and regulatory gaps, particularly in parts of Eastern and Southeastern Europe.
The EU is not standing still. In January 2022, it adopted the first drinking water watchlist, targeting two endocrine-disrupting compounds—beta-estradiol and nonylphenol—that can mimic or interfere with human hormones. The list is part of a broader effort to tighten monitoring and enforcement under the Water Framework Directive.
Groundwater Pollution: A Persistent Threat
Groundwater supplies roughly 65% of drinking water and 25% of agricultural irrigation in the EU, making its chemical status a matter of direct public health concern. The Water Atlas, which maps groundwater bodies based on EU standards, reveals troubling figures for several countries. In Luxembourg, 79% of mapped groundwater bodies failed to achieve a good chemical status in 2025. The Czech Republic followed with 55%, Belgium with 41%, and Germany with 40%.
Pesticides remain a primary threat. Trifluoroacetic acid (TFA), a breakdown product of certain pesticides and refrigerants, was detected in 94% of 36 tap water samples collected across 11 EU countries. Many pesticides also contain per- and polyfluoroalkyl substances (PFAS), known as forever chemicals, which have been found at 23,000 locations across Europe. These substances persist in the environment and accumulate in the human body, with potential links to cancer, liver damage, and immune system disruption.
The Heinrich Böll Foundation's researchers note that "around 80% of all wastewater worldwide enters water bodies without undergoing treatment." They add that "the idea that rivers would clean themselves soon proved to be an illusion: rivers and lakes became stinking, toxic cesspools." The statement underscores the urgency of continued investment in wastewater treatment and stricter regulation of agricultural and industrial runoff.
For European consumers, the message is mixed. In countries like Finland or Switzerland, tap water is not only safe but often superior to bottled water in quality and environmental impact. In Luxembourg, parts of Belgium, and the Czech Republic, however, residents may want to consider filtration or check local advisories. The broader challenge for the EU is to harmonise water quality standards and enforcement across its 27 member states, ensuring that the right to clean drinking water is not a privilege of geography.
