Hundreds of people have been alarmed by the sound of popping coming from their kettles after a change to the water supply in west Cumbria.
Many took to social media to complain with some expressing fears of a health risk. Some have stopped using tap water and others assumed there was a fault with their kettles.
But United Utilities today reassured consumers that the water was safe to drink.
Here is what the popping sounds like in this video from viewer Cheryl Corlett:
This is how the water company has to say about the issue: