Juvenile Chinook salmon can encounter a wide range of water quality conditions, from relatively clean to highly contaminated, as they migrate from freshwater to saltwater in Puget Sound. During this life stage, as they transition from fresh to saltwater, they are particularly sensitive to stressors such as toxic contaminants. Salmon’s marine survival depends on maximized growth. Currently, contaminant monitoring in juvenile salmon is not funded; however, it is a central metric of the Puget Sound Partnership’s Toxics in Fish Vital Sign, adopted in 2011 by the Leadership Council.