The Whirinaki water supply has today been chlorinated and a Boil Water Notice issued after low levels of e-Coli were found in the network.
The Boil Water Notice has been issued to the 280 properties that are connected to the Council-run Whirinaki water supply.
The instruction to boil water will stay in place until further notice, said Hastings District Council water services manager Brett Chapman.
The notices were being hand-delivered to all properties this afternoon and the information had been sent to Panpac and Contact Energy for sharing with staff.
Council started chlorinating the supply when the results were received today and that would also continue until further notice.