Residents are being urged to join a new campaign to raise awareness of river pollution.
Charity Action for the River Kennet (ARK) along with Newbury’s The Renewal Project wants volunteers to help mark drains that flow straight into the River Lambourn with their Yellow Fish plaques.
They bear the message ‘Only Rain Down the Drain’ to give a visual reminder that these drains empty straight into the River Lambourn untreated.
The project, to raise awareness of the damaging effects of pollution in rivers to our wildlife and fish, is also being supported by West Berkshire Council.
Anna Forbes, ARK Project Officer, said: “Rivers are at serious risk from pollution, as demonstrated earlier this month when diesel covered a 5.5km stretch of the River Kennet leaving 60 swans in need of rescue.
“Being careless about what goes into our rivers is also dangerous to humans and domestic pets.”
The charity said dumping chemicals such as paint, car oil, insecticides or fuels have a devastating effect.