Methamphetamine use in WA continues to fall, but two regional areas have recorded some of the highest weekly use of the drug in the country.
New data from the Australian Criminal Intelligence Commission's wastewater testing show meth consumption in regional WA for August 2019 fell by 10 per cent over four months.
It was the second consecutive report WA recorded a decrease in meth use, continuing the downward trend since a peak in December 2016.
The only other state to see a decrease in meth use was South Australia.
However, the regional use of meth remained well above that of capital city sites with two unnamed WA locations recording among the highest mean weekly use of meth in the country.
The collection covered about 57 per cent of Australia's population with seven testing sites in WA.
Results also indicated heroin consumption in both metropolitan Perth and regional WA had increased.
Police minister Michelle Roberts said the results were promising, but there was still work to be done.
"[The results] indicate however, that the initiatives we have put in place are having a positive impact," she said.
"There is still much more to do, to drive down meth abuse in our community and our pursuit of this terrible scourge will be relentless.
"We continue to attack this problem from both a law enforcement and a health and treatment issue, and we are getting results.
"I want to commend the police for their determination in disrupting lines of supply.
"It only goes to show that if you give police the resources - they can do the job and get results."
On a national scale, regional Australia's nicotine, alcohol, methylamphetamine, MDMA, MDA, oxycodone, fentanyl and cannabis average consumption exceeded that of its capital city counterparts.
