Arizona is debating the next steps it should take to protect limited groundwater, 40 years after the state’s landmark Groundwater Management Act became law. As the arguments take shape, it’s instructive to look west to California, which did not have groundwater legislation in place until 2014. The first round of management plans – which cover the basins with the most critical groundwater issues, mostly in the agriculture-heavy Central Valley – were due Jan. 31. The process has been laden with drama. And it’s anyone’s guess, after years of debate, whether California regulators will sign off on some basins’ plans.