Obviously, to conserve drinking water, its sources must be treated and preserved as well. Water is re-used over and over and often recycled after use. It may be used again in the same week or not for many years. The amount of water on the planet has remained the same for three billion years. While the demand for treated water has increased, the supply has not.
People often misuse the sewage system.
We must be very careful to avoid throwing waste in the sewer system simply for convenience. Toxic household products can harm the environment and find their way into the water we drink and the food we eat. Discard dental floss, hair, disposable diapers, plastic tampon applicators and other similar types of waste in a wastebasket, not in the toilet. They can create many problems at wastewater treatment plants. Do not dispose of it in the sewer system.