The Kapiti Coast District Council has started adding bore water to the supply for Waikanae, Paraparaumu and Raumati..
But the Council has warned residents boiled bore water can leave scale on jugs.
And it can cause popping sounds — this is because bore water coming to the boil makes more noise than ordinary river water.
Dave Bassett, the Water Treatment Plant Manager, says: “This low percentage of bore water shouldn’t make much of a difference to how the water tastes.
“However, people should avoid washing cars or windows in direct sunlight, as minerals in bore water potentially leave white marks behind when drying off in the sun.”
The KCDC says about 10 per cent of the supply will be from bores at present and it will take another day or so for the bore water to get from the Treatment Plant in Waikanae to everybody’s taps.
The Waikanae River has been flowing at 940 litres per second.
And Mr Bassett says Council would have to stop taking water from the river if the flow drops to 750 litres per second, at which time it would have to use 100% bore water.