A downpour on Saturday, during which 62mm fell at Tuggeranong between 6pm and 7.30pm, was so heavy that water flowed from the neighbouring property into the garage, yard and indoor pool area of Ruth Fenwick's home.

But the ACT government, which owns the block, said it would not need to test for any contamination and that the lot had been found clear of asbestos.

Ms Fenwick said the pool room's water rose about 70mm up the surrounding wall as the run-off seeped in through a back door.

Her living room would have been soaked next if the water had risen much higher.

"You can imagine it created a river down the side of the house into the yard, so all our landscaping is full of mud," she said.

"We're used to rain coming into the pool, but not like this."

Ms Fenwick had questions about whether her property had been contaminated with asbestos from next door.

The Asbestos Response Taskforce confirmed it owned and managed the neighbouring property, but said after the Mr Fluffy home was demolished and the lot's soil was tested, it was declared clear of asbestos.

A spokesman said the block was removed from the register of asbestos-affected homes in July.

While it tested soil across the demolition zone during checks, this varied between sites, the taskforce said.

"In this case almost the entirety of the block was within the demolition zone and testing was conducted in accordance with the national standard.

"All testing returned negative results for loose fill asbestos fibres.

"The taskforce is working with the neighbour regarding clean-up works but given the status of the formerly affected block, testing for loose fill asbestos fibres is not required."

While the spokesman didn't respond directly to questions about the taskforce's efforts to prevent run-off after demolishing the Kambah house, he said it took measures to control erosion when needed while remediating Mr Fluffy blocks.

Ms Fenwick, who early this week was pumping her pool to remove floodwater, said she would need to wait for the water to recede from the yard before checking for damage, and that none had been found inside after early checks.

"If it keeps raining we're going to keep having this issue unless they do something about that block," she said, referring to the taskforce.

"Other people shouldn't be impacted by their negligence of the block they now own."

The asbestos taskforce said it inspected the site on Monday after Ms Fenwick called, and met her on Tuesday morning about the incident.

Ms Fenwick said it told her it would prevent any further run-off from the property.