This week on Matter of Fact, we look at how the water crisis in Flint, Michigan eroded trust in the community. Now, its overshadowing efforts to vaccinate the vulnerable. Plus, people living near California’s Salton Sea are facing high rates of both asthma and COVID-19. Why they’ve already been struggling to breathe for decades. And, what does it mean to be an American? Meet federal judge Nancy Joseph, a naturalized American, rolling out the welcome mat for our nation’s newest citizens.