According to Queensland Country Life, the Maranoa Shire Council has contracted a Brisbane lab to test more than 200 samples from the bore with results expected this week.

"There are a number of potential causes for gas to be in the water supply," Maranoa Mayor Robert Loughnan reportedly said.

"Council officers are currently speaking with a number of parties, including the Department of Natural Resources and Mines CSG compliance unit, to determine the reasoning for the gas presence and whether it is linked with activity in the Gubberamunda aquifer."

The CSG compliance unit believed the "reduction of static head pressure over time" could have increased volumes of gas from the formations the bore intercepted.

"Based on information available to the department, it is unlikely that the increased gas in the water bores is being caused by CSG activities at this time," CSGCU reportedly said.

"The presence of naturally occurring methane in water bores is a common occurrence across the Surat Basin and has been happening historically for many decades before coal seam gas development started in the basin."

The town's shutdown Bore 2 was drilled into the Gubberamunda aquifer two years ago and is below

Bore 1's source.