The Legislative Council passed a motion on Tuesday calling for the West Tamar Council and the state government to compensate those affected by the 2016 landslip, including at least one family who continues to pay a mortgage on a house demolished after the slide.

Rosevears MLC Kerry Finch said the government had a duty to inform those building on the land that there was a risk of landslide. He said this had not occurred despite a history of landslides in the municipality.

"Each [family] has the daily worry of having hundreds of thousands of dollars invested in family homes that are perhaps now worthless," he said.

"What's most disconcerting about the awful situation confronting these families is that government, both the state and the local West Tamar Council, have known since the turn of last century that there is a landslip risk in the area."

Mr Finch said he had been contacted by a resident in Beauty Point who claimed he had been "duped" into buying a home at risk of landslide without being informed of the risk.

And in 1993, a home at Beach Road, Legana, was damaged in a landslide.

A draft report into landslips in the Deviot area by Pennington Geotechnics, commissioned by the West Tamar Council and open to public comment since June 12, found that landslide risk had not been properly communicated to developers.

The report found that: councils pushed back on the landslide zoning advice and approvals where given where further geotechnical and planning assessment should have been required; the state building legislation failed to capture the need for specific requirements for construction in these areas, diminishing the importance of the good management practices identified by the geologists; with time, even the prior knowledge of the extent and potential for land sliding was lost by councillors and planners, and inappropriate developments were approved, and the rational for appropriate planning lost; and there was a chronic skill shortage of geotechnical expertise in Tasmania, including soil testing and waste water design, with informed geotechnical advice still lacking.

West Tamar mayor Christina Holmdahl said that the final report on landslides would be delivered to council at its August 20 meeting, with its recommendations following public consultation passed on to the state government.

She said she would be able to comment after the August 20 meeting.