Mr O’Farrell will meet with members of the Save the Williams River Coalition this morning at Tillegra Bridge, part of the proposed site of the controversial dam. The coalition will discuss with the senior Liberal their concerns with the dam’s construction.

If built, Tillegra Dam will be 450 billion-litre storage in the Upper Williams Valley, north of Dungog.

Hunter Water has estimated the dam to cost $300 million and said its construction would give the region water security.

The Save the Williams River Coalition will take Mr O’Farrell to the eastern ridge of proposed site show the valley is, in their view, too geologically unstable.

“Our studies have shown that this area is too unstable and subject to landslides,” coalition spokeswoman Sally Corbett said.

Mr O’Farrell will meet with landowners who have been “holding out” on the sale of their properties in Tillegra basin.

“We believe he’ll agree the current water policy is going in the wrong direction,” Ms Corbett said.

“The State Government’s policy is wrong.”

The coalition has previously met with Opposition spokesperson for water utilities Chris Hatcher and opposition spokesperson for environment and climate change Pru Goward, who both voiced support for alternatives.

“The Opposition has a strong policy on water recycling,” Ms Corbett said.

“We’ll be urging to them to adopt a policy that precludes Tillegra and still guarantees water security for the region.”

Members of the Save the Williams River Coalition who protested at the company’s Newcastle office on Friday were told by Hunter Water’s managing director Kevin Young that the dam was essential to meet growing demand.