In many arid regions of the country, increasing demand for fresh water exceeds the ability of water supply agencies to provide an unlimited supply, especially during periods of drought.
Some cities restrict water use for landscaping, washing cars, and other non-essential uses.
This conserves valuable water, lowers household demand and expenses, and helps to preserve landscaping vegetation. Greywater recycling also helps reduce septic system loading and sewage treatment costs for municipalities. Greywater is wastewater from any household source other than toilets. Wastewater that includes toilet waste is termed black water. Because it contains fecal matter, black water is not safe for domestic recycling under any circumstances.