Voluntary euthanasia is another significant step closer to becoming legal in South Australia, after a bill passed its first Lower House hurdle with an overwhelming majority.

The bill passed the Upper House earlier this month and is the 17th attempt to reform the law in 26 years.

New South Wales is now the only state not in the process of legalising voluntary euthanasia.

A final vote on the matter due to take place on June 9.