The average number of fibres found in each 500ml sample ranged from 4.8 in the US to 1.9 in Europe.
Credit: Michael Heim/Alamy

Microplastic contamination has been found in tap water in countries around the world, leading to calls from scientists for urgent research on the implications for health.

Scores of tap water samples from more than a dozen nations were analysed by scientists for an investigation by Orb Media, who shared the findings with the Guardian. Overall, 83% of the samples were contaminated with plastic fibres.