Expand A recent study measured levels of sunscreen ingredients in seawater, sediment and coral tissue in Hawaii. Extremely small amounts of sunscreen ingredients were detected, while others could not be detected at all. When sunscreen ingredients were detected, the levels found were in the low to mid parts per trillion range, which is equivalent to adding one drop of an ingredient into a tanker truck of water or adding 10 drops of an ingredient into the Rose Bowl filled with water. Source: Mitchelmore CL, He K, Gonsior M, Hain E, Heyes A ,Clark C, Younger R, Schmitt-Kopplin P, Feerick A, Conway A, Blaney L. 2019. Occurrence and distribution of UV-filters and other anthropogenic contaminants in coastal surface water, sediment, and coral tissue from Hawaii. Science of the Total Environment 670:398-410.