Work is under way to ensure Manawatu's drinking water supplies are up to scratch, after the debilitating Havelock North gastro outbreak.
But someone familiar with the inquiry says it is too early to say if every water source in the country will need to be treated or not.
A report into the 2016 Havelock North gastro outbreak, released a week ago, made a swathe of recommendations about how drinking water should be handled.
It also found at least 750,000 people were drinking from "not demonstrably safe" water supplies. Read more