The waters of Puget Sound support the survival of many rare species, including mussels, salmon and killer whales. Puget Sound is an area where saltwater from the Pacific Ocean mixes with freshwater from rivers. Using a scientific approach, researchers have revealed that water from urban areas might contain chemicals that could harm these creatures. The team identified 64 chemicals that were never observed before in the water bodies. Moreover, eight chemicals were marked as potentially dangerous that will require further investigation. The researchers will continue to investigate the eight concerning chemicals to better understand their source of origin.