WEST Australians under the age of 20 could be banned from buying alcohol at bottle shops if a recommendation by a parliamentary committee is adopted.

While a minimum floor price on alcohol should be set by the end of the year to combat binge drinking.

In its final report into alcohol and drug problems in WA, the committee found the state had the world's 10th highest rate of alcohol consumption per capita.

Committee chair Janet Woollard said the state needed to urgently reduce the rate of alcohol consumption in WA, which is well above the Australian average.

"Sadly we've moved into a culture that accepts binge drinking; we've got to get that culture back to safe drinking and responsible drinking," Dr Woollard said.

The report recommends the government consider banning people under the age of 20 from buying alcohol from off-licensed venues as a way to restrict under-age drinking.

It also identifies increasing the price of alcohol per standard drinking as a key way to reduce consumption.

"Government action in Australia to increase price has already proved important in controlling and reducing consumption in other sectors, such as tobacco products and the use of water and electricity," it said.

"The need for state government action is urgent."

The committee urged the Health Minister to change laws which would enable a minimum floor price to be set by the end of the year to prevent the sale of the cheapest forms of alcohol.

Both Woolworths and Coles were slammed by the committee for engaging in "loss leading" practices by advertising alcohol at low prices in order to attract customers in their stores.

In one case a Woolworths Dan Murphy's store was found to be selling a bottle of wine at $1.95.

The committees view came in light of evidence by the two supermarket giants that they did did not encourage irresponsible drinking.

"The actions of Coles and Woolworths in retailing alcohol products do not match their stated positions ... that they are responsible retailers of alcohol and committed to the responsible service and supply of alcohol."

The report urged the government close a loophole which allowed adults to supply alcohol to minors and juveniles without the consent of their parents.

"At the moment 14, 15, 16-year-old children go along to parties and without their parents being aware of the fact, that are supplied alcohol at these parties," Dr Woollard said.

"When mum and dad, the older brother or sister go to pick them up, they're completely intoxicated. No one had told the child's parent they would be supplying them with alcohol."

The committee recommended health warnings to be placed on products made in WA and limit alcohol advertising around liquor outlets, outdoors, at sporting venues and through media distributed in the state.