The European Environment Agency (EEA) published its annual bathing water assessment this month, covering more than 22,200 monitored sites across the EU-27, Albania, and Switzerland for the 2025 season. The headline number is strong: 85% of EU bathing waters were rated excellent, and 96% met at least the minimum requirements of the EU Bathing Water Directive (BWD). Only 1.5% of sites remained classified as poor.

That top-line figure reflects genuine progress built over several decades. Systematic monitoring requirements under the BWD, combined with sustained investment in urban wastewater treatment infrastructure, have steadily reduced the discharge of untreated sewage into waters where people swim. Austria, Bulgaria, Cyprus, and Greece each recorded 95% or more of their sites at excellent quality in 2025. It's a long way from where many European countries stood in the 1990s, when poor classification was far more common.

Coastal Waters and Inland Lakes Perform Well, But River Quality Remains Below 50% Excellent

The 2025 data draws a clear line between water types. Coastal bathing waters performed best, with 88% classified as excellent across the EU. Inland lake sites came in at 78% excellent. Rivers are the outlier: only 47% of approximately 1,200 officially designated river bathing sites across Europe achieved excellent quality in 2025, making them by far the most challenging category to manage.

The EEA report explains why rivers are harder to protect. Unlike relatively stable coastal or lake environments, rivers integrate pollution from entire upstream catchments and respond quickly to rainfall. Combined sewer overflows, agricultural runoff from manure and fertilizers, and legacy contamination from industrial activity can all spike bacteria counts at a swimming site within hours of a heavy rain event. Short-term variability is the central problem: a river can test clean on a monitoring day and become unsafe within 48 hours.

Despite these challenges, there is real momentum around urban river swimming. Budapest, Berlin, Paris, Utrecht, Vilnius, and Riga have all expanded organized river bathing access in recent years, driven partly by public demand for outdoor recreation during increasingly hot summers. According to the EEA's 2025 assessment, these initiatives depend on sustained investment in upstream wastewater infrastructure alongside real-time public warning systems that can close sites quickly when pollution events occur.

New EU Water Pollution Rules Expand What Gets Monitored Starting in 2026

The BWD's monitoring framework has always focused on bacterial contamination: Escherichia coli (E. coli) and intestinal enterococci are the two indicators measured at every site. Those parameters capture sewage-related risks well. What they don't capture is chemical contamination, and that's the gap that EU Directive 2026/805, which entered into force on May 11, 2026, begins to address.

The new directive revises the EU's official lists of pollutants monitored in surface water and groundwater under the Water Framework Directive (WFD). Per- and polyfluoroalkyl substances (PFAS), including trifluoroacetic acid (TFA), are now subject to stricter controls. Agricultural pesticides and pharmaceutical residues face tighter environmental quality standards. Microplastics and indicators of antimicrobial resistance (AMR) have been added to EU watchlists for the first time, meaning monitoring for those substances is now required even if the exposure thresholds are still being established. Member States have until December 22, 2027 to transpose these changes into national law.

It's worth being precise about what this means in practice. The BWD and the WFD operate as separate legal instruments. An excellent BWD classification at a bathing site does not guarantee the water meets WFD chemical quality standards, and the reverse is also true. A river can have acceptable bacterial counts for swimming while still containing PFAS at concentrations that exceed health-protective thresholds. The 2025 bathing water data reflects only the bacterial dimension. The chemical picture, which the updated WFD rules are designed to clarify, will take years of monitoring to fully develop.

Persistent Poor-Quality Sites and What the Directive Requires

The report identified 324 EU bathing waters rated poor in 2025. For any site that carries a poor rating, the BWD requires member states to issue public warnings, impose bathing prohibitions or advice against swimming, and identify and act on the sources of contamination. Sites rated poor for five or more consecutive years face a mandatory permanent prohibition or permanent advisory against bathing.

Fifty-seven EU bathing sites met that five-year threshold for the period 2020 to 2024, with the majority located in Italy and France. Of those, only four had improved to at least sufficient quality by 2025. The EEA noted that bathing prohibitions or advisories were in place for roughly two-thirds of the remaining poor sites, but the underlying pollution sources had not been resolved at most of them. France, with 112 poor-rated sites representing 3.3% of its total bathing waters, the Netherlands at 4.1%, and Estonia at 4.6% recorded the highest shares of poor classifications among EU countries in 2025.

The EU Water Resilience Strategy, adopted by the European Commission in June 2025, frames these persistent failures within a broader goal: securing clean water as critical infrastructure rather than an environmental amenity. Over 50 implementation actions are underway, targeting enforcement of existing law, governance reform, and more integrated catchment management. Whether that translates into measurable improvement at the river sites that have been chronically poor is the more significant test ahead.