Knowing Where Your Water Comes From
According to Data360.org, US residents use 575 liters of water PER DAY. However, people rarely ask themselves, “Where Does It All Come From?”WHERE we get our water from:
According to San Diego Water Authority, Southern California receives up to 80 percent of its water from the Colorado River. San Diego Water Authority specifically buys its water from Metropolitan Water District in LA which owns and operates the Colorado River Aqueduct.
In addition to our own sources of surface water, ground water, recycled water, and conservation, San Diego Water Authority also has an agreement with Imperial Irrigation District (IID) which says, basically, that it will pay for their conservation costs if the water that is conserved will go to San Diego County. This agreement is called the Quantification Settlement Agreement (QSA).
So now you know WHERE the water comes from and how much of it comes from each source.
But, it is just as important to know WHO we are getting the water from-
Metropolitan Water District (62%) - MWD is our major water supplier as the control the Colorado River water and State Water Project water which San Diego uses.
Imperial Irrigation District (16%) - As mentioned above IID provides us all the water which they conserve and we in turn pay for the conservation needs and technology, such as canal lining to prevent loss of water. So this percentage reflects water transferred and conserved through QSA efforts.
Local Sources (22%) - This is water which we collect ourselves through our own ground water and surface water. This water also includes recycled water and water saved through conservation efforts.
Now for the million dollar question- How MUCH does each water source cost?
Since San Diego County Water Authority collects all these water supplies from all our supplier the prices San Diego residents primarily see are from Water Authority. The following cost estimates are the Water Authority marginal cost estimates. They are taken from the Equinox Center and reflect the low end of the estimates.
Imported Water- $875 per acre foot
Surface Water- $400 per acre foot
Ground Water- $375 per acre foot
Conservation- $150 per acre foot
Desalination and Recycled Potable Water are not currently being used but are being developed. So we can see that what we are paying for imported water (the water which we buy from Met) is more than twice the other options.