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The Project

The Need

New Delta Conveyance

Prior Decisions

Opportunities for Contractors



Fact Sheet:

Bay-Delta Science Project

The Metropolitan Bay-Delta Science Program includes supporting ecosystem investments and continued scientific exploration within the Bay-Delta.

Fact Sheet

The Delta Conveyance Project:

Why We Need to Modernize Water Infrastructure Now

California Department of Water Resources Director Karla Nemeth speaks about the urgent need to modernize State Water Project infrastructure in the Sacramento-San Joaquin Delta.

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California’s Sacramento-San Joaquin Delta

A Short History of Big Changes
By Jay Lund

Read the Article

Metropolitan Board Funds Next Phase of Delta Conveyance

Press Release Public Comment
Fact Sheets Tools & Templates

The Sacramento-San Joaquin Delta:

The Heart of California’s Water Supply

The Delta is important to the state’s economy, water supply, and quality of life for millions of Californians. Home to a valuable ecosystem and legacy communities. Learn about this place, its challenges and potential solutions.

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Metropolitan statement on initiation of single Delta tunnel environmental review

"Metropolitan appreciates the efforts by the Newsom Administration to advance a balanced and comprehensive portfolio of water actions, including Delta Conveyance." - Jeffrey Kightlinger, Metropolitan General Manager

View the Full Statement

Related Documents

About a third of Southern California’s water comes from Northern California via the State Water Project, passing through the Sacramento-San Joaquin River Delta. But aging infrastructure, climate change and the declining health of the Delta ecosystem threaten the reliable delivery of water supplies to Southern California. Modernizing the Delta conveyance system will strengthen the state’s water transportation infrastructure and provide greater operational flexibility to improve aquatic conditions in the Delta.


A Single-Tunnel Solution

At the direction of Gov. Gavin Newsom, California has initiated an environmental review process for the construction of a large tunnel that would carry water from the north underneath the Delta to delivery infrastructure in the south, bypassing the Delta’s imperiled environment. This single-tunnel conveyance project would feature two intakes with a total diversion capacity of 6,000 cubic feet-per-second (alternatives also will be evaluated). As Metropolitan continues to increase local supplies and promote conservation in Southern California, investment in the state’s water delivery system is the most affordable, cost-effective way to secure the region’s water future.

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Water projects require vision, leadership, and thoughtful and deliberate decisions, because they take a long time. We have to be visionaries and advance that vision together... because together we are so much stronger than we are apart.

- Gloria D. Gray, Metropolitan Board Chairwoman

Water is the lifeblood of our state, sustaining communities, wildlife and our economy. For more than a year, my Administration has worked to assemble a blueprint to secure this vital and limited resource into the future in a way that builds climate resilience for all communities and sustains native fish and the habitat they need to thrive.

- Gov. Gavin Newsom on the California Water Resilience Portfolio


The Delta Conveyance Design and Construction Authority

The Delta Conveyance Design and Construction Authority was formed in May 2018 to help design, develop and implement the proposed Delta Conveyance program, an infrastructure project to support the resiliency of California’s fresh water supply via a proposed single tunnel solution.


The materials below are designed to educate and inform Southern Californians on the Delta conveyance project.

Click here to access California WaterFix Archived Materials

The mission of the Metropolitan Water District of Southern California is to provide its service area with adequate and reliable supplies of high-quality water to meet present and future needs in an environmentally and economically responsible way.


The Metropolitan Water District of Southern California is a state-established cooperative of 26 member agencies – cities and public water agencies – that serve 19 million people in six counties. Metropolitan imports water from the Colorado River and Northern California to supplement local supplies and helps its members develop increased water conservation, recycling, storage and other resource management programs.

Metropolitain Water District of Southern California BE INFORMED, BE INVOLVED


© 2018 The Metropolitan Water District of Southern California. All rights reserved. Some photos featured on this website are courtesy of DWR.