California’s sewage treatment plants produce billions of gallons of wastewater every year, nearly all of it dumped into rivers or the Pacific Ocean like garbage. And this is how it’s done all over the U.S.and most of the world. But what if we began looking at treated sewage, instead, as a valuable resource? That’s what David Jassby and his co-authors Kurt Schwabe and Quynh Tran at the University of California, Riverside, did in a recent study published by the journal Environmental Science &Technology.