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Campaigners have accused Welsh Water of showing a lack of ambition when it comes to reducing water pollution.
Latest figures show the water company released sewage into rivers, lakes and the sea for more than 968,000 hours last year, compared to more than 916,000 hours the year before.
Giles Bristow, CEO of environmental group Surfers Against Sewage, said the levels were "catastrophic" and accused Welsh Water of having "no shame" over the amount of sewage being released.
Welsh Water said it was investing £2.5bn over the next five years to improve the environment.
