The two men and a woman, all aged in their 60s, were members of the same family, local media reported.
Police said one of the men collapsed while working in the in-ground tank, prompting the others to go to his aid before they also collapsed.
The police investigating whether emissions from a nearby petrol engine contributed to the deaths.
A gas reading later found high levels of carbon dioxide, the newspaper said.
Police were called to the property at Oolong, 235km (145 miles) from Sydney, soon after 18:00 (07:00 GMT) on Thursday.
The deaths are not being treated as suspicious.
Police said a post-mortem would be conducted.
"It's a very tragic loss," local man Bruce Newman told Nine News.
"It's something you don't hear about every day around this area."
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