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In 2015, drowning in Brazil was responsible for 6,043 deaths and was the second leading cause of death in children. Although several prevention strategies have been promoted to reduce drowning, most are still based on low levels of evidence. This study evaluated the effectiveness of prevention and water safety interventions in reducing drowning mortality. Data obtained from the National Mortality System for 36 years were split in two time periods to allow the comparison of drowning mortality numbers before and after implementation of SOBRASA’s drowning prevention and water safety programs and to check for any positive effects attributable to such programs. To assess differences between the two periods, a “drowning water safety score” (DSS) was estimated and compared to mortality/100,000 of population. There were 258,834 drowning deaths over 36 years. A significant decrease of 27% in drowning rates (5.2 to 3.8/100,000; p