The Trump administration this week declared that pumping more water from the Sacramento-San Joaquin Delta to supply farms will not jeopardize the endangered salmon and smelt that live in the estuary. This clears the way for the federal government to deliver more water, possibly as soon as next year.

The decision is a big and controversial step toward providing more water for people and less for fish. But the battle, yet another in a decades-long struggle for California’s water, has only just begun.