An analysis of South Australia's sewage has confirmed the state's unenviable title of being the nation's biggest user of the drug ice.
Analysis of the sewage of 14 million Australians across the country found methylamphetamine use was highest in South Australia, a report by the National Waste Monitoring Drug Program says.
"It demonstrates the need for a statewide but also a national response," Substance Abuse Minister Peter Malinauskas said.