A pair of recent court decisions in San Diego—Patz v. City of San Diego and Coziahr v. Otay Water District—have thrust California’s Proposition 218 back into the spotlight. But what is this proposition, and how does it affect our water bills and the state’s water providers? As Californians grow increasingly concerned about affordability, we asked Dave Owen, a professor at UC Law San Francisco, to explain how Prop 218 and water rates are connected. … [Dave Owen:] “Prop 218 matters for water because it imposes limitations on fees.”