July 16, 2026 - 330 views
People across Wales are being reminded to take care when swimming in rivers, lakes and the sea this summer, as rising temperatures encourage more people to head outdoors to cool off.
Natural Resources Wales (NRW) and Public Health Wales (PHW) say open water can provide major benefits for physical and mental wellbeing, but conditions can change quickly and natural waters carry different risks to swimming pools.
With the school summer holidays approaching, the organisations are urging people to be aware of dangers including cold-water shock, strong currents, sudden changes in depth, hidden underwater obstacles and blue-green algae blooms.
They say that while some coastal locations and a small number of river sites are designated bathing waters and monitored during the bathing season, many rivers and lakes across Wales are not.
Water quality can also change over short periods, particularly after heavy rainfall, with possible impacts from surface water run-off, drainage systems, wildlife and wastewater discharges. Even water that looks clean can contain bacteria, viruses or other contaminants which may cause illness.
NRW Environment Team Leader Hamish Osborn said Wales has many “fantastic places to connect with nature”, but people should remember that natural waters are different from managed swimming environments.
He said: “Conditions can change quickly. Most rivers and lakes in Wales are not designated bathing waters, so we encourage people to make informed choices about where and when they enter the water, follow the Wild Swimming Code and take sensible steps to protect their health and safety.”
Public Health Wales consultant Alice Munro warned that even in warm weather, water temperatures can remain extremely cold.
She said: “The weather, tides, currents and water depth can all change quickly so it is important to be aware of these before you enter the water and when you are in it.
“Getting in slowly and wearing a flotation device can reduce these risks when swimming in unfamiliar waters.”
People are being advised to choose recognised swimming locations where possible, avoid swallowing water, cover cuts and grazes with waterproof dressings, wash hands before eating and shower after swimming.
They are also being encouraged to avoid swimming after heavy rainfall when water quality may have deteriorated, and to stay out of the water if they have recently had diarrhoea or vomiting.
NRW and Public Health Wales say anyone who develops symptoms including diarrhoea, vomiting, stomach cramps or fever after swimming should seek medical advice.
