Authorities are hoping the ability to declare any house in Western Australia an alcohol-free zone will lead to a reduction in domestic violence.

Amendments to the Liquor Control Act allow the Department for Child Protection to apply to have any house in the state declared an alcohol-free zone.

They also allow homeowners or tenants to request their properties be recognised as alcohol-free.

The DCP's director-general Terry Murphy says any such application would only be made in cases where families were known to the department and there was an ongoing risk of harm.

The Member for Eyre, Graham Jacobs, says the changes could prevent violence in homes where alcohol is an ongoing issue.

"The object is that obviously in a culture of excessive alcohol within a household, young children can have a high risk of harm," he said.

Dr Jacobs was part of a parliamentary committee which earlier this year called for greater restrictions on alcohol use.

"We know that there is an association with crime but also higher instances of domestic violence, assaults, brawling" he said.

"It is about trying to curb some of that and I think this recent introduction making some residences an alcohol-free zone is a good one."

Any application to declare a property alcohol-free would need to be approved by the Department of Racing, Gaming and Liquor, which can seek advice from the local government authority and the Police Commissioner.