Sea foam may look sinister but it is mostly harmless and natural
Sea foam, often seen along Britain's coast, is a natural phenomenon caused by algae and weather conditions. It is formed when breaking waves churn up water containing organic material, creating foam that may appear sinister but is mostly harmless. While some may mistake it for pollution, the foam is a common occurrence and part of the marine ecosystem.
- ▪Sea foam is produced by a combination of algae and weather conditions.
- ▪The most common type of algae involved is phaeocystis, which is not toxic.
- ▪When algal blooms die, they leave behind organic material that creates foam when disturbed by waves.
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Breaking waves churn up water which contains a brown scum of organic material, creating the foam. Photograph: Charles McQuillan/Getty ImagesView image in fullscreenBreaking waves churn up water which contains a brown scum of organic material, creating the foam. Photograph: Charles McQuillan/Getty ImagesWeatherwatchEnvironmentSea foam may look sinister but it is mostly harmless and naturalPhenomenon, often seen around Britain’s coast at this time of year, is caused by a combination of algae and weatherDavid HamblingFri 22 May 2026 01.00 EDTSharePrefer the Guardian on GoogleAt this time of year a sinister-looking substance can often be sighted around Britain’s coast: a frothy foam piled up along the shoreline or appearing in long ribbons offshore.
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