Urban customers supplied by the Grampians system and rural customers connected to supply systems one and two of the Wimmera-Mallee Pipeline will move from stage four to stage one water restrictions.

Rural customers in supply systems three, four and six who are not yet connected or receiving an emergency-only supply from the pipeline will remain on stage four until fully connected to the pipeline.

Reservoir levels are 15.4 per cent, holding a total of 114,670 megalitres of water, compared with 6.4 per cent at this time last year.

GWMWater chairman Barry Clugston said there was enough water to supply the region for the next two years.

Mr Clugston said rain in September combined with savings from the pipeline allowed the GWMWater board to make the decision at a board meeting last week, after taking advice from the water authority's drought reference committee.

"Water is also being returned to some areas of the environment and allocations to some recreation lakes have recently been made, so the picture for our region is looking considerably brighter," he said.

"The pipeline has taken our region from being in one of the most vulnerable water supply situations in Victoria to one of better security."

Mr Clugston assured supply systems four and six customers that every effort was being made to connect them as quickly as possible to relieve them of water carting.

"Other arrangements to ease the burden of water carting on these customers continue to be investigated," he said.

"These could include a further increase in the frequency of the GWMWater water carting program, possibly supported by a limited and targeted summer channel run in some parts of the supply system six area, depending on pipeline progress. The situation for these customers will be carefully monitored in the lead up to summer."