WATER catchments across the region are spilling following the weekend's rain in a rare climate event.
The last time Coliban Water's reservoirs filled in July was in 2012.
Usually, they do not start overflowing until September or October.
The Upper Coliban reservoir began spilling last week, and Malmsbury after the weekend's rain, Coliban's executive general manager of climate and population adaptation Steve Healy said.
"The spilling at Upper Coliban and Malmsbury has meant that these reservoirs are closed to on-water recreation, for the safety of our users, and we will reassess this in the coming weeks," he said.
The storages are two of the region's three main water sources and supply people from Kyneton to Bendigo.
Lauriston's reservoir remains open for on-water recreation.
Mr Healy warned that people should not be lulled into treating water as if it is anything but a finite resource.
"We know that at some point in the future there will be more drought, much of the work we do is planning for the next 50 years and a changing climate," he said.
"We urge our customers to remember the five Permanent Water Savings Rules that use water efficiently and avoid waste."
The Bureau of Meteorology believes the wetter than average climate conditions will continue through to October.
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