Wellingtonians are facing slightly lower water bills, as the region's new water entity backs down on an initial set of prices in the face of public concern.

Residents are still in line for an average $6200 bill per year in 10 years' time - a decrease from the nearly $7000 bill suggested in March.

On Friday, Tiaki Wai announced that water charges will, on average, increase by 12.8 percent across the four cities in the coming financial year, instead of the 14.7 percent signalled in March.

That means for 2026-2027, the average water charge for households could be $2377 per year - an increase of $277 per year - rather than the $2400 per year first projected. Exact figures are set to be confirmed on 16 June.

Up to July, Wellington region's residents currently pay on average about $2100 in water charges through their rates bills.