Watercare is increasing the price of water and wastewater in Auckland by 2.5 per cent.
The company announced the hike today, just days after Auckland Council voted for a rates increase.
It estimates the average household's combined water and wastewater charges will increase by about $1.75 a month from July 1.
Watercare chief financial officer Brian Monk said the adjustment was necessary "due to the increased costs of service delivery and the need to invest in infrastructure to cater for Auckland's growing population".
"We are planning to spend $4.7 billion over the next 10 years on new water and wastewater infrastructure," he said.