A fresh assessment from the European Environment Agency (EEA) confirms that the vast majority of Europe's monitored swimming spots meet high health standards. Across the European Union, 96 percent of bathing sites comply with minimum safety requirements, and nearly 85 percent achieve the top classification of 'excellent'. The data, covering the 2024 bathing season, underscores the long-term impact of EU environmental legislation, particularly the Bathing Water Directive, which has driven steady improvements since its revision in 2006.
Yet the picture is not uniformly pristine. Approximately 1.5 percent of monitored waters are still rated 'poor', meaning they pose a risk of gastrointestinal illness or other waterborne infections. These problematic sites cluster in inland areas of France, the Netherlands, and Belgium, where dense populations and intensive farming create persistent pollution challenges. Coastal waters fare best—88 percent are 'excellent'—thanks to the diluting effect of large water volumes. Inland lakes achieve 78 percent 'excellent', while rivers lag at just 47 percent, vulnerable to upstream runoff from agriculture and urban areas.
Three Persistent Threats
The EEA identifies three main sources of contamination that continue to plague Europe's waters. First, agricultural runoff: overuse of chemical fertilisers and manure washes nitrates and phosphorus into streams and lakes, triggering eutrophication. This process fuels toxic cyanobacterial blooms that deplete oxygen and can poison swimmers. Second, sewage overflows: many older European cities rely on combined sewer systems that mix rainwater with domestic waste. During heavy downpours, these systems are overwhelmed and discharge untreated sewage directly into rivers and coastal waters. Third, emerging chemical contaminants such as PFAS (forever chemicals), microplastics, heavy metals, and pharmaceutical residues are increasingly detected in rivers and groundwater, though the current Bathing Water Directive only tests for faecal bacteria like E. coli and enterococci.
Climate change exacerbates all three issues. Warmer water temperatures accelerate algal blooms, while droughts reduce river volumes, concentrating pollutants. Flash floods then wash accumulated toxins into swimming areas all at once. The EU is responding with stricter legislation, including updated chemical rules and the Nitrates Directive, and has allocated over €15 billion for water-system improvements, including upgrades to municipal treatment plants to remove microplastics and pharmaceuticals.
Monitoring Gaps and Forecasting
Despite progress, the monitoring system has limitations. Eline Boelee, an expert advisor on water and health at the Dutch research institute Deltares, points out that testing is infrequent: 'If you take a sample, you do your analysis, a couple of days later, you have your results. But people have already swum in that water for weeks. So that is tricky. But doing more frequent monitoring is super costly.' To address this, Deltares develops water quality models that can forecast long-term impacts of climate change, helping authorities take proactive measures rather than relying solely on reactive sampling.
Under the Bathing Water Directive, member states must create bathing water profiles for each site, detailing geological characteristics, pollution sources, and bacterial proliferation risks. They are also required to inform the public about water quality ratings, warnings, and swimming bans. Boelee suggests simple public messaging: 'Don't swim after a heavy rainfall or check if you see a film of algae.'
If a site is rated 'poor' for five consecutive years, authorities must identify the causes and either prohibit swimming or advise against it. Between 2000 and 2024, 57 bathing spots were classified as 'poor', and only four upgraded to 'sufficient' in 2025. Of the 332 sites rated 'poor' in 2024, just 88 improved to at least 'sufficient' the following year.
Best and Worst Performers
Among EU member states, Cyprus leads with 100 percent of its bathing sites rated 'excellent', followed by Greece (97.1 percent), Bulgaria (96.9 percent), and Austria (96.5 percent). The overall share of 'excellent' sites rose from 80.7 percent in 2006 to 84.8 percent in 2025, while 'poor' sites fell from 2.4 percent to 1.5 percent. The number of monitored bathing sites has also grown, from 10,852 in 1991 to 22,010 in 2025, reflecting better water management and increased public interest in natural swimming.
For travellers planning a summer dip, the data offers reassurance: most European waters are safe. But as the EEA report makes clear, the battle against pollution is far from over. EU law has been instrumental in driving improvements, but persistent challenges in inland areas and emerging chemical threats require continued investment and vigilance.
