Bristol Water is telling customers in the Clevedon area to boil their water before use until further notice.
The boil notice is affecting properties with the postcode BS21.
The notice is likely to be in place for at least 48 hours but those customers affected will be informed directly when the boil notices is removed.
One test result from the raw water quality samples taken at Clevedon treatment works detected Cryptosporidrum.
Therefore, the advice to boil the water is a precaution.
Bristol Water staff will be hand delivering notices to properties affected by the notice.
As part of their customer promise compensation will automatically be paid to those customers affected after the event.
We would remind people in the affected areas to follow the advice from Bristol Water and boil their drinking water and allow to cool before use. The levels of Cryptosporidium detected in the water supply is low and the advice to boil the water is as a precaution. If people feel unwell or experience symptoms of diarrhoea and vomiting they should contact NHS 111. If your symptoms become severe, you should contact your GP.
More top news
The banking giant will keep 594 branches open across the country.
Traditional Cornish baked pastry is being celebrated this week culminating with the World Pasty Championships at the Eden Project.
A ginger cat was found tied to a fence with a rope around her neck in addition to other injuries near Bristol.