The Biden administration’s environmental justice office is investigating whether California’s water agency has discriminated against Native Americans and other people of color by failing to protect the water quality of San Francisco Bay and the Sacramento-San Joaquin Delta.

The U.S. Environmental Protection Agency’s investigation was triggered by a complaint filed by tribes and environmental justice organizations that says the the state Water Resources Control Board for over a decade “has failed to uphold its statutory duty” to review and update water quality standards in the Bay-Delta.