Formed in 1991 by David Nesmith, The Environmental Water Caucus (EWC) is a coalition of organizations working toward sustainable and equitable water policy in California. United by a strong opposition to the water export model of The Delta Plan, the EWC first submitted an alternative plan in 2010. EWC’s plan was updated in 2017 in response to the Twin Tunnel Project, and again in 2022 in response to the single tunnel Delta Conveyance Project.