Team,
Saving water is important for many reasons, and some are more obvious than others. While some people believe that conservation of natural resources makes ethical and moral sense, others appreciate conservation from a practical side, in that water is a limited resource and depleting it unnecessarily reduces future availability.
Cost
The most direct, visible and personal reason to save water is to reduce your own expenses. Using water costs money. Overuse of water reduces the available supply, and according to fundamental economic principles, the reduction in the supply of water will result in a corresponding increase in price.
Environment
While water is an abundant resource on Earth, fresh, potable water is in limited supply. Fresh water is more important to humans than salt water because we use fresh water to cook, bathe and drink. However, fresh water also supports numerous forms of life, such as freshwater fish and algae, and depleting the supply of fresh water upsets the ecosystem. Humanity's overuse of water has direct effects on species outside of our own.
Energy
When you use more water, you force your local water treatment plant to purify and filter more water and send more to your household. All of these services require energy, so the increased use of water depletes yet another resource. The Mono Lake Committee states that 39 percent of the freshwater withdrawals in America can be attributed to electricity production from fossil fuels and nuclear energy alone. Your own household expends more energy the more water you use as well, as water used for cooking, washing and bathing is generally heated.
Treatment Systems
Before you can use water, it must pass through filtration and treatment plants. Using too much water can overwhelm these plants to the point that untreated water can be flushed through the system before being fully treated, possibly resulting in a health hazard. Additionally, too much water use can blow out septic systems, which can release untreated material into the ground, possibly contaminating both groundwater and soil.
Future Generations
As populations expand and modernize, water consumption rises. We can safely predict that future generations will have a greater need for water than we have today. Conserving water today means we can delay or prevent future water development projects, which will require more energy and money to build. Additionally, any supply that we can preserve today will exist for the future.