Water stock for Pennine Sources, which supplies Bolton and the rest of Greater Manchester, is now at 35.8 per cent.
Rivington Reservoir and Belmont Reservoir are among the reservoirs across the North West with lower-than-normal water levels due to the prolonged dry weather.
Rivington, which measures across 465 acres and carries 2.8 million gallons of water, is currently undergoing works by United Utilities to move water from one part of the region to another and ensuring it goes where it is needed.
This is a normal process, usually so that the water can be used for drinking purposes. Similar works are also being carried out across Belmont Reservoir.
As of August 17, the United Utilities website notes that the water stock for Pennine Sources sits at a total of 35.8 per cent.
For comparison, levels sat at 67.3 per cent for this time last year.
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The works come as the North West has seen one of the driest starts to a year on record, with local reservoir levels lower than what would usually be expected.
A United Utilities spokesperson said: “The North West has seen one of driest starts to a year on record, and we’re asking customers to do their bit and use water wisely in their homes and businesses.
“We are being savvier with how water is moved around; we are not draining off any more than we usually would.
“With local reservoir levels lower than we would expect for the time of the year, we can all play our part to make sure there’s enough water for people, wildlife and the environment.
“We are working hard to carefully manage our water resources through our vast integrated network of pipes to move water around from one part of the region to another, and ensure it goes where it is needed.”