A groundwater exploration company says it is aware of nine potential cases of gas seepage on the Western Darling Downs in southern Queensland.
The State Government ordered an investigation in May last year after video emerged of gas bubbling in the Condamine River near Chinchilla.
A report found there was no environmental threat from the gas seepage.
Geologist Michael Cook says farmers in Chinchilla, Miles, Dalby and Tara should inspect their own properties for gas bubbling in puddles and standing water after the floods.
"We're not encouraging people to get out into floodwaters and take risks to check their farms if it's not safe to do so but if ... they do notice anything just to - we've got the seep hotline - to try and document what they can and let us know," he said.
© ABC 2013
20:55 EDT A blistering heatwave is scorching western Queensland with temperatures above 40 degrees Celsius and will spread to the south-east later this week.