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The country with the highest clean water score worldwide in 2024 was the Seychelles. With a score of
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out of 100, this was more than
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points higher than the goal of
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points. Greenland and Canada followed, with scores of
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and
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points, respectively. The clean water index measures the degree to which ocean regions are free of contaminants such as chemicals, eutrophication, harmful algal blooms, disease pathogens, and trash.
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Leading scores of clean estuarine, coastal, and open ocean waters worldwide as of 2024, by selected country
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The clean water index measures pollution by chemicals, excessive nutrients, human pathogens and trash in estuarine, coastal, and open ocean waters. Clean waters target is 70 out of 100. The reference point is that there should be zero pollution from chemicals, nutrient, human pathogens and trash. This goal score is higher when the pollution of estuarine, coastal, and open ocean waters is minimized. The goal score is lower when there are high levels of pollutants.
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Ocean Health Index. (December 3, 2024). Leading scores of clean estuarine, coastal, and open ocean waters worldwide as of 2024, by selected country [Graph]. In Statista. Retrieved November 30, 2025, from https://www.statista.com/statistics/1143413/clean-water-index-region-globally/
Ocean Health Index. "Leading scores of clean estuarine, coastal, and open ocean waters worldwide as of 2024, by selected country." Chart. December 3, 2024. Statista. Accessed November 30, 2025. https://www.statista.com/statistics/1143413/clean-water-index-region-globally/
Ocean Health Index. (2024). Leading scores of clean estuarine, coastal, and open ocean waters worldwide as of 2024, by selected country. Statista. Statista Inc.. Accessed: November 30, 2025. https://www.statista.com/statistics/1143413/clean-water-index-region-globally/
Ocean Health Index. "Leading Scores of Clean Estuarine, Coastal, and Open Ocean Waters Worldwide as of 2024, by Selected Country." Statista, Statista Inc., 3 Dec 2024, https://www.statista.com/statistics/1143413/clean-water-index-region-globally/
Ocean Health Index, Leading scores of clean estuarine, coastal, and open ocean waters worldwide as of 2024, by selected country Statista, https://www.statista.com/statistics/1143413/clean-water-index-region-globally/ (last visited November 30, 2025)
Leading scores of clean estuarine, coastal, and open ocean waters worldwide as of 2024, by selected country [Graph], Ocean Health Index, December 3, 2024. [Online]. Available: https://www.statista.com/statistics/1143413/clean-water-index-region-globally/
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