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ObjectiveTo assess the impact of a sugar-sweetened beverage (SSB) reduction initiative on customer purchasing patterns, including volume sales of healthy and unhealthy packaged drinks and sales value of all packaged drinks, in a major Australian aquatic and recreation provider, YMCA Victoria.DesignProspectiveSetting16 aquatic and recreation centres in Victoria, Australia.InterventionsThe SSB-reduction initiative aimed to remove all SSBs (excluding sports drinks) and increase healthier drink availability over a 1-year period.Primary and secondary outcome measuresItemised monthly drink sales data were collected for 16 centres, over 4 years (2 years preimplementation, 1 year implementation and 1 year postimplementation). Drinks were classified as ‘green’ (best choice), ‘amber’ (choose carefully) or ‘red’ (limit). Interrupted time series analysis was conducted for each centre to determine the impact on volume sales of ‘red’ and ‘green’ drinks, and overall sales value. A novel meta-analysis approach was conducted to estimate the mean changes across centres.ResultsFollowing implementation, volume sales of ‘red’ drinks reduced by 46.2% across centres (95% CI: −53.2% to −39.2%), ‘green’ drink volume did not change (0.0%, 95% CI: −13.3% to 13.2%) and total drink sales value decreased by 24.3% (95% CI: −32.0% to −16.6%).ConclusionsThe reduction of SSBs in health-promoting settings such as recreation centres is a feasible, effective public health policy that is likely to be transferable to other high-income countries with similarly unhealthy beverage offerings. However, complementary strategies should be considered to encourage customers to switch to healthier alternatives, particularly when translating policies to organisations with less flexible income streams.