Z and Caltex petrol stations have closed their car washes in Auckland in a bid to conserve water.
The closures come as Auckland has been told it needs to save more water otherwise drastic measures will be taken.
The service station chain has stopped operating more than 20 of its car washes in the Auckland region from the end of last week, and had also asked its subsidiary Caltex, whose stations are independently owned, to follow suit.
Z senior communications advisor Jeremy Clarke said the company wanted to play its part in reducing water demand.
BP, however, is continuing it car wash operations because a proportion of the car wash water at its company-owned sites is recycled.