PARIS – A deadly surge in drownings has swept across France as record-breaking heatwaves drive residents toward unsupervised rivers and lakes.
French authorities reported this week that 40 people have died while swimming in non-monitored areas since June 18.
The deaths have prompted an urgent government warning regarding the dangers of “wild swimming” in areas lacking professional oversight.
“There is a tragic scourge of drownings,” Prime Minister Sébastien Lecornu said on Tuesday. “The latest figures we’ve received are 40 deaths since 18 June. Most of the victims are young people.”
The current crisis highlights a critical gap between the demand for cooling during extreme heat and the availability of safe, monitored bathing sites.
Public health officials warn that unsupervised waters often conceal lethal hazards, including strong currents, submerged debris like tree branches, and fluctuating water quality.
EU Water Quality Standards and Safety
To mitigate these risks, the European Environment Agency (EEA) monitors inland waters under the EU Bathing Water Directive, the bloc’s main legal framework for recreational water.
This directive requires member states to regularly test designated bathing sites for pollutants and bacteria, publicly classify their status, and take remedial measures when standards are not met, ensuring they are safe for human contact.
A recent analysis based on EEA data identifies the countries with the highest concentration of “excellent” rated bathing lakes – waters that meet the directive’s strictest benchmarks.
The following percentages represent the proportion of inland bathing waters rated as excellent in 2025:
- Austria: 96.5%
- Finland: 94.7%
- Germany: 91.5%
- Italy: 87.7%
- Switzerland: 84.4%
- Sweden: 82.1%
- France: 71%
- Netherlands: 70.4%
- Hungary: 64%
- Poland: 56.7%
Officials note that these figures cover only officially designated bathing waters and do not include the kind of informal riverbanks and quarries where many of France’s recent drownings have occurred.
Alpine and Nordic High-Quality Zones
Austria leads Europe in water purity, with 96.5% of its bathing waters rated excellent. This is attributed to the Alps covering two-thirds of the country, creating natural reservoirs of pristine water and giving local authorities a relatively small number of sites to monitor intensively.
Key Austrian sites include Lake Klopein, which reaches 26°C, and Attersee, where summer visibility extends to 9 metres. In Hallstatt, designated safety is reinforced through the Badeinsel Hallstatt artificial island, where access points, ladders and demarcated swimming zones are clearly laid out.
Finland, known as the land of a thousand lakes, maintains a 94.7% excellence rate across its 187,000 bodies of water larger than 500 square metres. Municipalities coordinate closely with national health authorities to open and close official bathing spots as water quality changes during the season.
The labyrinthine Saimaa lake, the fourth largest in Europe, is noted for its 14,000 islands and the presence of wild ringed seals. In the south, Lake Tuusula serves as a warmer alternative, reaching 22°C and drawing families to supervised public beaches and piers.
Central European Bathing Infrastructure
Germany utilizes a network of “Strandbäder” or lidos to manage public swimming. These facilities combine high water quality with safety amenities, including lifeguards, changing rooms and clear zoning for swimmers, water sports and boating.
Lake Griessee is the country’s warmest spot, often exceeding 25°C, while Lake Walchensee in Bavaria is characterized by turquoise waters caused by dissolved calcium carbonate. At both, strict local bylaws limit motor traffic and regulate access points to protect water quality.
Switzerland’s “Badi” culture provides a similar regulated environment in cities like Zurich and Geneva. Local authorities treat lakes and rivers as part of the public transport and public health systems, investing in pontoons, safety ladders and seasonal lifeguard patrols. Lake Lugano remains the warmest Swiss option, peaking at 26°C in August.
Southern and Eastern European Trends
In Italy, the Mediterranean climate results in higher water temperatures and a long season for lake tourism. Lake Kaltern in South Tyrol can reach 28°C, while Lakes Como, Garda, and Maggiore remain primary hubs for monitored open-water swimming, with local prefectures empowered to close sections quickly when water tests deteriorate.
Hungary specializes in thermal bathing, with Lake Hévíz recognized as the world’s largest swimmable thermal lake. Its temperatures fluctuate between 22°C in winter and 36°C in summer, and access is tightly managed through ticketed facilities that double as health spas.
Lake Balaton, the largest freshwater lake in Central Europe, hosts the “Balaton Átúszás,” a 5.2 km competitive swimming event that proceeds only when water quality and weather conditions meet thresholds set by local authorities and safety services.
Risk Factors in France and Poland
France’s inland water excellence rate stands at 71%. Despite the presence of high-quality sites like Lake Annecy and Lake Aiguebelette-the latter reaching 28°C and heavily patrolled during peak season-the volume of unsupervised swimming in off-grid locations has contributed to the current fatality rate.
French mayors have wide-ranging powers to regulate bathing locally, including temporary bans, but enforcement in remote river stretches is patchy. Emergency responders say people often underestimate sudden drops in depth or cold currents flowing beneath apparently calm surfaces.
Poland reports a 56.7% excellence rate. The country’s largest lake, Śniardwy, is frequently referred to as the Masurian Sea due to its scale and exposure to wind, which can generate rapid changes in surface conditions.
Safety officials in Poland note that while Lake Licheńskie reaches 24°C, the national average for natural lakes is lower, at approximately 20°C, increasing the risk of cold-water shock when swimmers jump in suddenly after prolonged heat.
Guidelines for Safe Wild Swimming
Authorities emphasize that water clarity or color-such as the tea-like hue found in some Swedish lakes due to organic forest material-is not a reliable indicator of safety or purity. Even visually pristine water can hide bacterial spikes after heavy rain or agricultural runoff.
To avoid the hazards cited by the French government, swimmers are advised to:
- Swim exclusively in sites officially designated and monitored under the EU Bathing Water Directive, which national and local authorities list on their seasonal public information portals.
- Verify the presence of active lifeguard supervision before entering the water, particularly when swimming with children or weak swimmers.
- Adhere strictly to posted warning signs regarding currents, sudden depth changes and submerged hazards.
- Avoid jumping or diving into unknown waters where submerged debris may be present, and enter gradually to test depth and temperature.
The European Environment Agency continues to update water quality metrics as part of the ongoing implementation of the EU Bathing Water Directive. In France, officials say the immediate test in the coming weeks will be whether public information campaigns and targeted local bans can redirect people from informal river spots to safer, regulated bathing areas as the heat persists.
