On Thursday, Contra Costa County, the Planning and Conservation League and Food and Water Watch, as well as two other Delta local agencies, Central Delta Water Agency and San Joaquin County announced they will file a lawsuit against the Metropolitan Water District of Southern California (Met) over their plan to purchase several islands in the San Francisco Bay-Delta estuary.

On March 14, 2016, Metropolitan Water District had filed a Notice of Exemption under the California Environmental Quality Act for the purchase of the Delta islands, claiming the purchase was for Delta habitat restoration purposes.