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Water Supplies

California is one of seven western states that rely on water from the Colorado River or its tributaries. For years, California used more than its basic apportionment of 4.4 million acre-feet of water a year, primarily by relying on surplus supplies and water apportioned to but unused by Arizona and Nevada.

In the late 1990s, as Arizona and Nevada began to fully use their apportioned supplies, and federal authorities, along with other Colorado River Basin states, challenged California to develop a comprehensive plan to reduce its reliance on surplus Colorado River supplies and ultimately live within its basic apportionment.

In response, California developed the draft California Colorado River Water Use Plan​  to gradually reduce the state’s use to its apportionment of 4.4 million acre-feet by 2017. The plan described key terms which were included in the 2003 Quantification Settlement Agreement, and the 2003 Colorado River Water Delivery Agreement which established water budgets for Imperial Irrigation District and Coachella Valley Water District to help facilitate water transfers from farms to cities.



Exchanges & Water Banking

The projects and programs Metropolitan has developed to restore reliability of Colorado River supplies cover a wide range of topics. In addition to transfers, exchanges and groundwater banking, Metropolitan has developed specialized conservation programs whereby Metropolitan invests in conservation programs outside its service area and receives the water that is conserved. The conservation programs vary and include canal lining, land fallowing, crop rotation and irrigation improvements, among other options. In addition, Metropolitan has collaborated with other parties in the Colorado River basin to bank water in surface reservoirs. Known as “Intentionally-Created Surplus" these surface water banking programs have allowed Metropolitan to take advantage of existing surface reservoirs to store conserved supplies for later use.

Water transfers, exchanges and water banks are important water management tools that allow agencies to augment local supplies and utilize external distribution and storage systems. Metropolitan’s water portfolio includes a number of water transfer and banking agreements with state, federal, public and private water districts and individuals.

Current banking/transfer programs that deliver supplies via the Colorado River Aqueduct include:
  • Imperial Irrigation District Conservation Program
  • Palo Verde Irrigation District Land Following and Crop Rotation Program
  • Quantification Settlement Agreement Transfers

Additional projects funded jointly with Southern Nevada and Central Arizona:

  • Warren Brock Reservoir
  • Yuma Desalting Plant
  • Mexico Water Treaty Pilot Conservation Project (Minute 319)

Planning for Long-term CRA Supplies

Metropolitan’s principal goal in investing in these supply programs is to provide a full Colorado River aqueduct to meet Southern California’s water needs in dry years. Ultimately, however, climate change and legal disputes could make meeting that goal more challenging in the future. To provide reliable supplies in the future, Metropolitan is coordinating with other basin states to implement recommendations of the Colorado River Basin Study and working to preserve the Quantification Settlement Agreement for the Colorado River.

Colorado River Basin Study
Released by the Bureau of Reclamation and the Colorado River Basin states in December 2012, the Colorado River Basin Study evaluates water supply and demand in the Colorado River Basin over the next 50 years, and identifies options and strategies to meet the demand gap. Options identified in the study include:    








  • Increases in urban and agricultural water-use efficiency
  • Agricultural-to-urban water transfers
  • Brackish water desalination
  • Weather modification through cloud seeding
  • Removal of non-native species
  • Seawater desalination

While some of the options can be developed quickly, others could take decades to realize. Metropolitan is working with the Colorado River Basin states and the federal government to evaluate which options are the most promising and to implement them.













Delta Water Supplies

Water flowing through the Delta, supplies 30 percent of Southern California’s drinking water, 33 percent of the Bay Area’s, and up to 90 percent of the Central Valley’s drinking and irrigation water. Some communities are 100 percent dependent on the Delta for their water supplies.

Over the years, the Delta’s ecosystem has deteriorated, and its 1,100-mile levee system is increasingly vulnerable to failure caused by earthquakes, floods and other forces of nature. The decline of the Delta’s ecosystem has led to historic restrictions in water supply deliveries. The result is a pressing two-fold need: improve California’s water reliability and restore the Delta’s fragile ecosystem.

The Delta was once a vast marshland covered with tulles and teaming with wildlife. Settlers, lured at first by the gold rush of the mid 1800s, built levees to drain and reclaim the land.

Environmental Conflicts

Tidal wetlands are an important source of food and shelter for fish such as delta smelt that live year-round in the estuary.  Adjacent floodplains such as the Yolo Bypass are feeding grounds for young salmon on their journey to the Pacific Ocean.

Today, about 95 percent of the original wetlands and original floodplains are no longer part of the Delta ecosystem due to levee construction and other human activities.  Yet it remains California’s most important estuary and a vital environmental resource, home to more than 750 plant, bird, animal, and fish species.

Water Supply Risks

Today’s Delta region faces numerous threats that are projected to worsen.  Absent intervention, California’s water supply system and the Delta ecosystem are at risk of collapse and are projected to worsen due to a variety of natural and man-made stressors.

Seismic

There are several faults running through the San Francisco Bay Area region that could affect the Delta. According to the U.S. Geological Survey, there is a 66 percent chance of a magnitude 6.5 earthquake hitting the Bay-Delta region by 2032. Such an earthquake could cause the levees that surround the Delta islands to collapse, flooding up to 30 Delta islands. Salt water from San Francisco Bay could migrate eastward, rendering the Delta as an undrinkable source of water supply for up to three years until extensive repairs are completed. The statewide economic costs of such an event could exceed $40 billion.

Sea-level Rise

The official state guidelines call for planning efforts in the Delta to assume a 16-inch rise in sea level by 2050 and 55 inches by 2100. Rising sea levels will not only put greater pressure on the Delta’s dirt levees, but will cause seawater to intrude further inland impacting water quality.

Subsidence

When levee construction beginning in the 1850s transformed the Delta from marshland to farmland, it exposed the peat soils, which began to oxidize, compact and blow away. This process of subsidence continues. What were once islands are now more like bowls, constantly depending on levees. The total volume of soil lost, or the void currently below sea level, is in excess of 3.5 million acre-feet or almost 8,000 Rose Bowl stadiums. As the subsidence continues, the water pressure on the levees becomes greater.

Fishery Declines

While numerous scientific panels have attributed the decline in the Delta’s health to numerous causes, enforcement efforts to date have focused almost exclusively on curtailing public water supplies from Delta facilities. Export agencies experienced cutbacks to pumping dating back to 1991 due to Endangered Species Act requirements. During the last two decades export pumping to the State Water Project and Central Valley Project has been reduced by more than 2 million acre feet.

Non-native Species

More than 95 percent of the biomass in the Delta is non-native. Striped bass, Black bass, Asian clams and many other invaders, large and small, are either eating the native populations or the foods on which they rely.

In this highly-altered environment, the introduced species are over-running the native species and are a key factor in reducing populations of some endangered species.

Public water agencies like Metropolitan are promoting a more comprehensive approach to restoring the Delta as a way to restoring reliable water supplies long-term.

California WaterFix

Fixing the Problem

Federal and state officials, water agencies and other interested parties have undertaken a comprehensive effort to fundamentally and systematically improve both the state’s water supply reliability and restore the Delta’s ecosystem. These efforts are known as the California Water Fix and California EcoRestore. These strategic action plans will:

Construct a new conveyance tunnel to protect California’s water supply; 

And improve the Delta ecosystem through habitat restoration. 

Without a strategic investment in the Delta, the water supply and ecosystem will continue to deteriorate and jeopardize the delivery of safe, reliable drinking water to 25 million people.

The California Water Fix proposes to build three new intakes in the northern Delta and to transport the supply via twin tunnels to the existing California Aqueduct system. The new intakes will improve drinking water quality while creating a much more flexible water project that can avoid conflicts with migrating fish species. The tunnel conveyance method will protect the supply from natural threats such as earthquakes.

To further help the Delta ecosystem, California EcoRestore proposes to protect and restore more than 30,000 acres of habitat such as tidal marshes and seasonal floodplains in the coming years.

For additional information about the California Water Fix, the Bay Delta Conservation Plan including the planning process, environmental review and other facts, please visit California Water Fix.

View Metropolitan's California WaterFix Toolkit site for materials designed to help educate and inform Southern Californians on the project. Collateral can be downloaded at any time for use and distribution.



Delta Stewardship Council 

The Delta Reform Act of 2009 established the Delta Stewardship Council to advance the co-equal goals of ecosystem restoration and water supply reliability.

At a Glance Fact Sheets

Metropolitan Documents:

Top Five Reasons (September 2016)
Benefits of a California Water "Fix" for:
Inland Empire
L.A. County
Las Virgenes MWD
Orange County
Pasadena
San Diego County
San Gabriel Valley
South Bay
Three Valleys MWD
Ventura County
Southern California Businesses
Spanish Version


Taking Action To Secure Southern California’s Water Supply (June 2015)
State-Federal Proposal For Delta Restoration (June 2015)

State of California Documents:
Water Quality in the Delta
Progress Report (Jan. 2016)

Presentations

Why We Need the California Water Fix

Regional Slides


























Videos

2014 Comments/Statements on BDCP Environmental Impact Report
Metropolitan's Comment Letter
Member Agency's Comment Letters

Delta Water Laws (2009 Comprehensive Water Package)

On November 4, 2009, the California Legislature passed a comprehensive package of bills to improve water resource management statewide.

Among other water resource management packages, the law established co-equal goals for the State of California to improve the reliability of state water supplies and to restore the Delta ecosystem.

The package included the establishment of the Delta Stewardship Council to advance the co-equal goals of ecosystem restoration and water supply reliability. Delta governance institutions such as the Delta Conservancy, the Delta Protection Commission and the California Water Commission are taking the lead on ecosystem restoration and creation of a new economic strategy for the region. Read more.
 
Delta Stewardship Council












The Delta Reform Act of 2009 established the Delta Stewardship Council to advance the co-equal goals of ecosystem restoration and water supply reliability. Read more.

Delta Islands

Bay-Delta Live

Bay-Delta Live is an online data hub used by resource managers, scientists, conservationists, policy makers, academics, local community interests, and other stakeholders. The goal of the project is to expand open and transparent sharing of information to better understand the complex and dynamic ecosystem of the Sacramento-San Joaquin Bay Delta. Bay-Delta Live provides information from multiple sources using enhanced visual interfaces. This site is supported by state and federal water, wildlife and natural resources organizations, science workgroups, The Metropolitan Water District of Southern California, State and Federal Water Contractors Water Agency and others.

Imported