Understanding Phoenix's Water Supply and Most Precious Resource

The amazing thing about Phoenix is that you can goto gain votes in Nevada, Arizona and California! Later,
months without any precipitation at all, but water stillwhile in Colorado he said he would never ever try to
flows out of the faucets, and the lawns get wateredtake more of Colorado's water. He found out the
and not too many people stop to try and figure it out.meaning of the expression, "Whiskey is for drinking,
Just ask any Phoenician where the water comes fromwater is for fighting".
and you might as well ask them to explain the innerThe Central Arizona Project (CAP) is a 336 mile
workings of a micro processor.system of aqua ducts, tunnels, pumping stations, and
The fact is that the average person uses 150 gallonspipelines that carry water from the Colorado River in
of water / day, and the Phoenix valley receives lessLake Havasu to central and southern Arizona. The
than 9 inches per year, so where does it come from?project cost $4.4 billion and was conceived in the
Phoenix does not rely on only one water source. City1960's with the purpose of helping Arizona use its
and towns in Phoenix depend upon a combination ofallotment of water from the Colorado river. It is
water sources or supplies. Each city depends on thesedesigned to bring 1.5 million acre feet of Colorado River
sources in varying degrees.water to Pima, Pinal, and Maricopa counties and is
* SRP water that comes from the Salt and Verdeowned and operated by the United States Bureau of
River watersheds.Reclamation.
* Colorado River water that is delivered via the CentralOnce it arrives, the water quality level is not of
Arizona Project (CAP) canal.sufficient quality for human consumption. The final step
* Ground water that is pumped from aquifers belowis to pass through a water
the surface.santan-vista-water-filtering-equipment treatment plant
* Reclaimed water that is treated and used forwhich many confuse for a water reclamation plant
non-potable uses.used to treat sewage. The Town of Gilbert and the
SRP delivers water from the Salt and Verde rivers toCity of Chandler recently opened a $102 million high
cities that have water rights that are appurtenant ortech water treatment plant for water received from
connected to the land. The cities that have waterthe Colorado River. The plant uses ballasted
rights to water from the Salt and Verde watershedsflocculation to treat Central Arizona Project water. At
that is delivered via the SRP are Avondale, Chandler,the current capacity, the plant can produce up to 24
Gilbert, Glendale, Mesa, Peoria, Phoenix, Scottsdale,million gallons of water per day. Each city has the right
Tempe and Tolleson. Each city receives water basedto half the capacity.
on the land included in the SRP service area for whichFor many years ground water has been pumped from
they have water rights. The service area does notthe ground faster than it has been replaced, creating a
necessarily align with city boundaries. Gilbert forcondition called "overdraft". As groundwater levels fall,
example, has 12,585 acres of land with no SRP waterit is more expensive to pump and the water quality
rights. The total SRP service area consists of 248,000diminishes. This is an on-going issue for the valley
acres and draws from the Salt and Verde riverbecause many areas rely on groundwater as their
watersheds that cover 13,000 square miles, orprimary water supply.
approximately 11% of the state of Arizona (114,000To address this issue, the Arizona Groundwater
sq.miles).Management Code was passed in 1980. Part of the
SRP water is stored in 6 reservoirs; 4 on the Saltcode was the establishment of 5 Active Management
River and 2 on the Verde River. Roosevelt Lake, theAreas, (AMA's) where the overdraft was the most
largest lake in Arizona, represents 70% of SRP'ssevere. For the Phoenix, Prescott and Tucson AMA's
storage capacity is located on the Salt river along withthe primary goal is safe yield by the year 2025. Safe
Apache Lake, Canyon Lake and Saguaro Lake.yield is defined as the long term balance of ground
Horseshoe and Bartlett reservoirs are located on thewater withdrawn and natural and artificial recharge of
Verde river.the aquifer. Reclaimed Water
Over 100 years ago in 1903, the articles ofReclaimed water is a valuable resource and has a
incorporation were filed in Maricopa county by the Saltvariety of uses, with the most important trait being it
River Valley Water Users Association, (SRVWUA). Inreduces the dependence on other sources of water;
1904, the federal government and SRVWUA signednamely ground water and surface water. Reclaimed
an agreement to build Roosevelt Dam, with thewater is primarily used for industrial purposes, irrigation
members of SRVWUA pledging more than 200,000of golf courses, parks, highway medians, common
acres of their land as collateral for the federalareas in communities, and providing decorative lakes
construction loan. Construction of the dam waswhich act as above ground storage facilities, and
completed in 1911 at a cost of $3.8 million.ground water recharge. Gilbert along with other cities in
SRP currently delivers more than 1 million acre feet ofthe Phoenix area are committed to using 100% of their
water to the water service area. SRP water isreclaimed water.
treated in city water treatment plants before beingMost people would not even know that the Riparian
delivered to customers. Colorado River Water via thePreserve at Water Ranch in Gilbert is home to 7
Central Arizona Project (CAP)recharge ponds. Reclaimed water is piped to the
In 1922, the signing of the Colorado River Compactrecharge ponds where it enters the underground
divided 7 seven states into the Upper Basin (Utah,aquifer and in the process goes through the natural
New Mexico, Wyoming and Colorado) and Lowerfiltering process, and helps replace groundwater that
Basin (Arizona, Nevada and California) with the intenthas been withdrawn. The Central Arizona Project also
to divide the Colorado river equally between the Uppermanages recharge projects with the goal of assisting
Basin and Lower Basin states. Within 5 months of thein groundwater recharge. Chandler's Veterans Oasis
signing, all states ratified the agreement exceptPark is similar to the Riparian Preserve in that it serves
Arizona! It was not until 1944 that Arizona ratified theas a recreational and environmental education facility
compact, 22 years later mainly because of allocationand a recharge facility that uses reclaimed water to
issues with California. Arizona continued to disputerecharge the aquifer and create a wetland
allocations until the Supreme Court finalized theenvironment.
allocations in the 1964 decision, Arizona vs. California.Believe it or not, I've only touched the surface of water
Arizona's current allocation is 2.8 million acre feet /management in Arizona. The more you learn about it
year. The Colorado river drains 244,000 square milesthe more you realize there is so much more to learn.
across the seven states that comprise the Upper andThe water we enjoy in Arizona now is the result of
Lower Basin states.preparation and work that began over 100 years ago
In light of this history, it is amazing that Senator Johnwith tireless work by many. That diligence continues
McCain, GOP presidential candidate suggested in Aug.today by stewards of Arizona's most precious
2008, that the 1922 Colorado River Compact beresource so that it is as easy as turning on the tap.
renegotiated due to the population growth in the LowerOur responsibility is to use it wisely, enjoy it and
Basin states. Ouch! That's one way to lose votes inconserve it so that we can continue to enjoy this oasis
Colorado, New Mexico, Utah and Wyoming. Or was itin the desert.