An outbreak of a diarrhoea-type illness is expected to last for “at least” a week in south Devon, with people told to boil their tap water until further notice.

Public Health said 22 cases of cryptosporidiosis had been confirmed in Brixham and up to 100 people had reported symptoms to their GP in the last week.

Infections from the parasite cryptosporidium can be caused by drinking contaminated water or swallowing it in swimming pools or streams.

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SWW’s chief customer officer, Laura Flowerdew, said there was “no indication” of cryptosporidium in the water when it left the treatment works.

She said the water met all of the UK’s standards and requirements.

“We’ve extended and enhanced our sampling given the issues that have been identified with cryptosporidium in the area,” she said.

Ms Flowerdew said it was one of the additional elements of sampling on Tuesday which first confirmed there was concern with the water supply.

“Following that we’ve immediately raised a boil notice for customers in the affected areas which are Hillhead and Alston areas,” she said.

The water company initially told affected customers they would receive £15 in compensation.

The payment, which will be made automatically, has since been increased by £100, to £115, SWW confirmed.