California’s top water agency is under federal investigation after a coalition of California tribal nations and environmental justice groups filed a civil rights complaint accusing it of discriminating against several Native tribes and communities of color. The complaint, filed in December, says the California Water Resources Control Board has failed to protect the water quality of one of the nation’s largest estuaries — the Sacramento-San Joaquin Delta — and has intentionally blocked tribal members and residents of color in some cities from giving input on major decisions.