Welsh Water admits spilling untreated sewage near dolphin habitat for decade

The worst-performing treatment plant was Cardigan, which releases water into the River Teifi and its estuary, a bottlenose dolphin habitat. Photograph: Alex Ramsay/Alamy

Welsh Water has admitted to spilling untreated sewage near a rare dolphin habitat for at least a decade.

A BBC investigation found the water company had been illegally discharging untreated wastewater at dozens of sewage plants, often for years at a time.