Trends in Unintentional Drowning Mortality Among U.S. Adults Aged ≥25 Years, 1999–2024: A U.S. Surveillance Analysis

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Background/Objectives: Drowning is a leading preventable cause of unintentional injury death, yet U.S. prevention efforts have largely focused on children. Despite international declines in pediatric drowning mortality, adult trends remain poorly characterized. We examined long-term trends and disparities in unintentional drowning mortality among U.S. adults aged ≥25 years from 1999 to 2024. Methods: Using CDC WONDER Multiple Cause of Death data, drowning deaths were identified using ICD-10 codes W65–W74, V90, and V92. Age-adjusted mortality rates (AAMRs) per 100,000 were computed by direct standardization to the 2000 U.S. standard population. Joinpoint regression estimated the annual percent change (APC) and average annual percent change (AAPC). Three sensitivity analyses assessed transport-related code exclusion, pandemic-era restriction, and multiple cause-of-death coding. Results: During 1999–2024, 101,743 unintentional drowning deaths occurred among U.S. adults aged ≥25 years (76,554 males; 25,201 females), with 58.09% in natural water or outdoor settings. The overall AAMR showed a non-significant increase (AAPC: 0.55%, p = 0.054); however, joinpoint analysis identified stable rates through 2013 followed by a significant sustained increase (APC: 1.32%, 95% CI: 0.32–2.32, p = 0.012). The male-to-female rate ratio narrowed significantly from 4.00 (1999) to 3.32 (2024) (ratio of rate ratios: 0.83, p = 0.0006), driven by a sustained female increase (AAPC: 1.27%, p < 0.001). Adults aged 65–85+ showed the steepest rise (AAPC: 1.15%, p < 0.001). Non-Hispanic AI/AN adults had the highest rates (3.47–5.44 per 100,000), and non-metropolitan areas consistently exceeded metropolitan rates. Conclusions: A significant upward trajectory has persisted since 2013, with marked disparities by age, sex, race/ethnicity, and geography. Adult-focused, equity-driven prevention strategies aligned with USNWSAP implementation are needed to address this underrecognized burden.

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