The lake was reportedly at 1.76 metres on Sunday, down from 2.2m on October 22.

A spokesman for TasWater said the organisation had been supplied with data by the Department of Primary Industries, Parks, Water and the Environment that confirmed there was "sufficient water" to meet customers' requirements over summer.

Neither TasWater, DPIPWE or the Elizabeth Macquarie Irrigation Trust provided their data to Fairfax Media.

When asked whether a contingency plan had been developed to deal with the current level of evaporation, TasWater said they would "engage with customers and provide water conservation tips".

"These tips will assist the community understand the level of water use around the home and suggest ways to use it more efficiently," the spokesman said.

"This collaborative response can help ensure there is enough water during these unusually dry conditions."

A spokesman for DPIPWE said they had provided TasWater and the Northern Midlands Council with a water balance tool that could be used to investigate volumes of Lake Leake under a range of varying scenarios that could affect rainfall and evaporation.

"This has been provided to assist them with forward modelling under a range of different scenarios. DPIPWE has not indicated a particular scenario is likely or made any forecasts regarding Lake volume," he said.

TasWater said all drinking water originating from Lake Leake was first treated at a storage area at Campbell Town.

Acting director of public health Mark Vetich said the treatment of the water made it safe for consumers, regardless of the volume of the body of water it was drawn from.

"The drinking water supplied to Campbell Town and Ross water is fully treated by the Campbell Town Water Treatment Plant," he said.

"Changes to the quality of the raw water can be managed by the water treatment plant to maintain the safety and quality of the drinking water.

"The safety and quality of drinking water are closely monitored by TasWater and Public Health Services."