The River Wey is hugely popular for water sports like rowing, paddleboarding and wild swimming.
But one man says a public health emergency should be declared.
Andrew Stanley is treasurer of Weybridge Sailing Club and says some of the things he’s seen recently have been grim.
He claims the storm drains can’t cope, and he’s seen effluent and weeds “covering” the river.
Thames Water says it is the first company to provide storm overflow alerts for inland waters with ‘near real-time’ data on its website.
The Environment Agency removed more than 200 tonnes of floating pennywort from the River Wey in December.