Tararua District Council has issued a boil water notice for the Dannevirke water supply on Friday.
The notice will continue for three days while further tests are taken. E.coli was detected in the town’s supply during a routine network sample.
A council spokesperson said it had notified residents through the “usual digital channels”.
“Our team is working on this issue in partnership with Taumata Arowai to ensure our testing is conducted accurately and as swiftly as possible, the earliest we can remove the Boil Water Notice is after three days clear testing and an update will be provided on Monday.
The spokesperson said electric jugs with a cut-off switch can be used as long as they are full – allow the water to come to the boil and wait for it to switch off (do not hold the switch down to increase the boiling time).