Its catchment storages are 88 per cent full as it prepares for peak summer demand.

Coliban has been able to capitalise on a wet winter in the southern half of Victoria, where many of the water systems that feed its storages come from, executive general manager of climate and population adaption Steve Healy said.

"Spring hasn't been great but as long as one season is good we are OK," he said.

Despite that, Mr Healy said now is not the time to forget permanent water saving restrictions.

"(They) are water saving rules to ensure we use water efficiently and avoid wastage to conserve it for the future," he said.

"The rules are easy to follow. The main ones are to use a leak-free hose fitted with a trigger nozzle and only use watering systems between 6pm and 10am on any day.

People do follow the rules during summer, Mr Healy said.

"It's been a big change since the Millennium Drought, compared to the way people used water in the 1990s, that's for sure," he said.

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Coliban Water has another 18 months of water available from Lake Eppalock and three years of supply from its southern storages should dry times continue into autumn and beyond, Mr Healy said.

"So it's not as though you would have a dry autumn, winter and spring and go straight into greater restrictions," he said.

"We are pretty well off, certainly when compared to some other areas of the state."

The latest Bureau of Meteorology climate outlook has predicted a drier than average summer, followed by an easing of conditions in central Victoria.

"While outlooks for drier than average conditions may ease for some areas heading into 2020, several months of above average rainfall would be needed to see a recovery from current long-term rainfall deficiencies," the bureau warned.