Scientists have completed the first comprehensive assessment of UV-filters in surface seawater, sediment, and coral tissue from multiple coral reefs around the island of Oahu, Hawaii. UV-filters are active ingredients in sunscreens, but are also added to many other products, including textile, plastics, and paint to prevent photo degradation. The UV-filters oxybenzone and octinoxate have received attention by policy makers regarding their potential impact on corals. The research will help provide a baseline for future risk assessments.