Surfing After Rainfall: What You Need to Know

When we get a proper downpour here in Cornwall, all that rainwater has to go somewhere and most of it ends up flowing straight into the sea. As it travels over fields, roads, and drains, it can pick up all sorts along the way. We're talking mud from farmland, fertilisers, animal waste, and in some cases, sewage from water systems that can’t handle the sudden volume.

That kind of runoff tends to collect near river mouths, harbours, and other sheltered spots where the water doesn’t move around as much. And when it lingers, so can the bacteria.

That said, not every beach is affected the same way. Cornwall has plenty of open, west-facing beaches that flush out quickly thanks to tides and strong Atlantic swell. These spots stay cleaner and are usually safer to surf even after heavy rain, if you know where to go.

That’s something we take seriously. Whenever you surf with us, we’ll always pick the best and cleanest location for the day. We check the conditions daily, and after a storm, we steer clear of any areas where runoff might be an issue. Whether you’re brand new to surfing or just looking to refine your surfing skills, we’ll make sure you're in safe water so you can focus on having fun and catching waves.

And if you're ever checking things for yourself, the Safer Seas & Rivers Service app by Surfers Against Sewage is a great tool. It gives live updates on water quality at beaches all over Cornwall and beyond.