People in Martinborough have been warned to boil their water after e-coli bacteria was found in the town's supply.

Photo: 123RF

South Wairarapa District Council warned that all drinking water must be boiled including that used for food preparation, washing and cleaning teeth.

It said babies, young children, pregnant women, the elderly and people with weakened immune systems were most at risk of getting sick.

The council said there were no reports of illness so far.