22/08/2026
On 17 August 2026, the Environment Agency identified a bloom of potentially toxic Blue-Green Algae in the River Thames around the Ham and Kingston Designated Bathing Water site.
The Environment Agency has now confirmed that the bloom is present between Sunbury Lock and Teddington Lock, spanning the stretch of the River Thames flowing through Kingston.
The algae may look like green or blue paint on the surface of the water and river bank.
You can’t tell if an algae is toxic just by looking at it, so it’s safest to assume it is. Keep pets and children away from the river and avoid entering or touching the water until further notice.
This bloom is made worse by the current drought conditions, with slower flowing warmer water.
Given the current weather forecast, the Blue-Green Algae bloom may continue for some weeks.