Reducing the amount of water entering your system improves the treatment by increasing the time the waste spends in the system. This also provides more time for settling, decomposition of the waste, and more time to soak into the absorption field. The amount of water used depends on the number of people using the system, how water is used, and the condition of the water supply system in your home. Turn off water between uses, and repair plumbing fixture leaks. Consider which actions use the most water.
Toilet flushing usually ranks highest.
Low-flow models could reduce water use by more than half. Placing a brick in the toilet tank reduces the water required to fill the tank and the amount of wastewater entering your septic system. Bathing and clothes washing are next in order of water use. For washing clothes, use a suds saver and run full loads. In hard-water areas, the softener may be a significant user of water.