The head of the Special Commission of Inquiry into crystal methamphetamine and other amphetamine-type stimulants (ATS), Professor Dan Howard, will deliver a report to the Governor of NSW on January 28.

The inquiry does not have the power to make the four-volume report public and Professor Howard said he could not comment on the inquiry's findings and recommendations.

"I extend my sincere thanks to all those whose contributions informed the work of the Inquiry, including the many people who generously shared their lived experiences of ATS use in the hope it would help others," Professor Howard said.

"I also acknowledge the great assistance that the Inquiry received during our regional hearings in Lismore, Dubbo, Nowra, Broken Hill, East Maitland and Moree, and the courtesy and cooperation shown during the Inquiry's many site visits and other engagements.

"I am confident that the Inquiry's recommendations provide an effective way forward for drug policy in NSW."

The inquiry traveled to Wagga in late April and visited Calvary Riverina Drug and Alcohol Centre "to hear first-hand about drug treatment programs and the impacts of crystal methamphetamine ... in the region," according to Professor Howard.

The inquiry also visited Pathways Murrumbidgee and held a private meeting with Indigenous stakeholders.

Professor Howard said at the time that Wagga was "among the regional communities particularly affected by use of crystal methamphetamine and other illegal amphetamine-type stimulants".

NSW Premier Gladys Berejiklian announced the Inquiry in November 2018 to investigate "the nature, prevalence and impacts of the drug crystal methamphetamine", the adequacy of current measures and options to strengthen NSW's law enforcement, education, treatment and rehabilitation responses.

Over the past 14 months the inquiry has received more than 250 submissions and heard from more than 150 witnesses over 47 days of hearings and taken written testimony from a further 86 witnesses.