Californians have moved heaven and earth to get water to the state’s thirsty cities and farms. We pipe water through the nation’s longest aqueducts, store it in the tallest dams and pump it over mountains. But when it comes to the storm water that falls directly on our cities, we flush it out to sea. For California, fresh off a historic drought and suddenly the de facto leader of U.S. climate policy, wasting any water is unacceptable. That’s why Senate Bill 231, by state Sen. Bob Hertzberg, D-Van Nuys, is so important.