Natural Resources Wales is investigating and has warned visitors not to go into the water.
Beachgoers are being warned not to swim at two spots along the Ceredigion coast after an "abnormal" pollution incident.
Natural Resources Wales said it was alerted to discoloured water flowing from the river Hawen on to Llangrannog beach at about 08:00 BST on Friday. Dr Carol Fielding, team leader of NRW's Ceredigion Environment Team, said: "We have acted quickly to investigate and to make sure steps are being taken to stop the pollution at its source.
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