Wild Swimming Is Booming — But Are You Swimming Safely?
There’s something truly magical about plunging into a cool river, lake, or coastal cove on a warm summer’s day. Wild swimming has captured the hearts of hundreds of thousands of people across the UK, offering a sense of freedom, connection with nature, and a powerful boost to mental and physical wellbeing. But as more of us head to natural waterways, it’s more important than ever to understand the health considerations that come with swimming outside of a chlorinated pool.
The good news? With a little knowledge and preparation, you can enjoy wild swimming safely all year round. Here’s what every open-water enthusiast should know before they take the plunge.
Understanding the Risks in Natural Water
Natural bodies of water — rivers, lakes, reservoirs, and the sea — are wonderful environments, but they’re also home to a range of microorganisms and pollutants that don’t exist in a treated swimming pool. Being aware of these risks isn’t about putting you off swimming; it’s about empowering you to make informed choices.
Bacteria and Pathogens
One of the most common health concerns for wild swimmers is exposure to harmful bacteria. E. coli and Enterococci are indicators of faecal contamination, often introduced into waterways through agricultural run-off, sewage overflows, or urban drainage. Swallowing even small amounts of contaminated water can cause stomach upsets, vomiting, and diarrhoea.
Leptospirosis (also known as Weil’s disease) is another risk, spread through the urine of infected animals — particularly rats — entering water sources. While relatively rare, it can be serious if left untreated, so covering any cuts or grazes before swimming and showering afterwards are sensible precautions.
Blue-Green Algae
During warm weather, particularly in still or slow-moving freshwater, blue-green algae (cyanobacteria) can bloom rapidly. These blooms can produce toxins harmful to humans and animals alike. If you spot a greenish, paint-like scum on the surface of a lake or reservoir, it’s best to stay out entirely and keep dogs away too. Symptoms from exposure can include skin rashes, eye irritation, and gastrointestinal illness.
Pollution and Run-Off
Heavy rainfall can dramatically worsen water quality in a very short space of time. Storm water washes pollutants, agricultural chemicals, and sewage overflow into rivers and coastal waters. Many experienced wild swimmers follow a simple rule: avoid swimming for at least 48 hours after significant rainfall, particularly near farmland, urban areas, or river mouths.
How to Check Water Quality Before You Swim
One of the best habits you can develop as a wild swimmer is to check water quality before you enter any natural body of water. There are several ways to do this:
- Check the Environment Agency’s Bathing Water Quality results — these are published for designated bathing sites around England and are rated Excellent, Good, Sufficient, or Poor.
- Use the Safer Seas and Rivers Service app from Surfers Against Sewage, which provides real-time alerts about sewage discharges near coastal and inland spots.
- Test the water yourself — this is where having a reliable water quality test kit makes a genuine difference. If you regularly swim at a favourite spot that isn’t an official bathing site, or if you want reassurance after a period of heavy rain, testing the water for bacterial contamination gives you real, actionable information rather than guesswork.
At Wild Swimming Tests, our test kits are designed specifically with open-water swimmers in mind — straightforward to use, accurate, and able to detect key indicators of water contamination so you can make confident decisions about where and when to swim.
Practical Tips to Protect Your Health
Beyond checking water quality, there are several simple steps that significantly reduce your risk when wild swimming:
- Don’t swallow the water — keep your mouth closed and avoid dunking your head if you’re unsure of water quality.
- Cover cuts and abrasions with waterproof dressings before entering the water.
- Shower or rinse off thoroughly after every swim, paying attention to your face, ears, and any open skin.
- Wear ear plugs to reduce the risk of swimmer’s ear or infections caused by bacteria entering through the ear canal.
- Wash your hands before eating or drinking after a swim.
- Be alert to symptoms — if you develop a fever, rash, or gastrointestinal illness within a few days of swimming, mention your swim to your GP.
Don’t Let Caution Kill the Joy
It’s worth saying clearly: wild swimming is, for the vast majority of people, an incredibly rewarding and safe activity. The benefits — reduced stress, improved mood, better cardiovascular fitness, and a deeper connection to the natural world — are well documented and genuinely transformative. The goal of understanding health risks isn’t to frighten you away from the water; it’s to ensure that every swim you take is one you can feel confident and good about.
The wild swimming community is a knowledgeable, generous, and safety-conscious group. By sharing good practice, checking conditions before we swim, and using tools like water quality test kits to stay informed, we all help to keep our beloved waterways safe and accessible for everyone.
Ready to Swim Smarter?
Whether you’re a seasoned open-water swimmer or just starting to explore your local rivers and lakes, having the right information is everything. Browse our range of easy-to-use water quality test kits at wildswimmingtests.co.uk/shop and swim with confidence this season. Your health — and your love of wild swimming — is worth protecting.
📷 Photo by Todd Quackenbush on Unsplash
