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 its been unable to meet Health Ministry targets 95 percent of the time.

Its blaming equipment issues, treatment plant outages and workplace health and safety improvements.

Chief Executive Tonia Haskell says a new part for one of the plants is coming from Germany in May to June.

She says in the meantime, they're keeping it going as best they can, but the problem is its a bit intermittent.