The powerful interests who vie for shares of the state’s ever-changing water supply — dubbed “water buffaloes” — are adept at fending off political and legal assaults by their rivals and the outcomes of their clashes are often stalemates.

That’s why it was surprising in June to see two game-changing decrees out of Washington, one from the new Biden administration and another from the Supreme Court, affecting two of the state’s most prominent water interests, Southern California’s Imperial Irrigation District and the San Joaquin Valley’s Westlands Water District.