Wellington Water has again failed to meet fluoridation targets.
The water provider says there's been a drop in fluoride levels across the region over the past four months, so it has been unable to meet targets 95 percent of the time.
It's blaming equipment issues, treatment plant outages and workplace health and safety improvements.
Chief Executive Tonia Haskell says there's been maintenance issues at a couple of plants.
"We put the new kit in Gear Island treatment plant- it was over Covid and it wasn't up to the level that we wanted, but we needed something in there in a hurry. We're now going to have to go back and buy something good, that's coming from Germany."
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