Ground water use is lower in the McLaren Vale region, as vines mature and land use changes.
A report says the use of ground water in the McLaren Vale area, south of Adelaide, has declined by more than two-thirds in just over a decade.
The figures from the Adelaide and Mount Lofty Natural Resources Management Board show 2,900 megalitres of water were used in the 2005-06 season.
In 1994-95, the figure had been 9,100 megalitres.
A trend of wetter spring months is credited for the decline, along with changing land use and irrigation practices, maturing vines and greater use of reclaimed water.
