Where Does Our Water Come From?
People use water every day for dozens of different things. Whether it's
brushing your teeth, washing the dishes or quenching your thirst, water
is the one thing you can't do without in daily life. But as essential
as water is, few people know where their water comes from or how it gets
to their tap.
In the Sacramento region, water comes from two sources: underground water
basins called aquifers, and surface water sources such as the American
River and the Sacramento River.
Rain and snowfall are the real source of supply for both underground water
(also known as groundwater) and surface water such as rivers and streams.
Groundwater is basically rain that has trickled through rock layers, forming
pools after many years. Rivers are fed by rain and snowmelt that runs
off from mountains into networks of streams and creeks called watersheds.
Reservoirs such as Folsom Lake capture and store water for use later.
In many areas, groundwater basins have been depleted because water is
drawn out at a faster rate than rain trickles back down. Droughts are
particularly hard on groundwater supplies. Surface water such as rivers
and streams also depend on rain and snowfall in the Sierras from year
to year. A series of dry years can seriously reduce the water flowing
in rivers and stored in lakes and reservoirs.
How Does Water Get to Our Homes?
Water arrives at your tap after a long and expensive journey from its
source. Whether it comes from a river or from a groundwater well, water
must be treated and purified before it is delivered to homes and businesses.
After it is treated, water travels through a distribution system to individual
homes and other buildings.
In the Sacramento area, there are many local water suppliers. Each maintains
a portion of the region's water distribution system. Water suppliers prepare
a report every year - called a Consumer Confidence Report - that describes
exactly where your water comes from, how it is treated, and what if any
contaminants it contains. You can get a copy from your
local
water supplier.
After water is used in your home, it goes through another system of pipes
to a wastewater treatment plant. The water is treated to meet statewide
standards and then released, or discharged, into rivers and streams at
approved locations. Some wastewater is recycled, or re-treated, and used
again to irrigate golf courses, freeway medians and parks. Recycled water
is also used to flush toilets in some areas.