Greywater — wastewater from sinks, showers, baths, and laundry — represents a significant water resource that most households send directly to the sewer. The average U.S. household produces 40 to 80 gallons of greywater per person per day. In a household of four, that's 160 to 320 gallons of water per day that could, in principle, be redirected to the landscape.
The potential is real. The implementation requires understanding what greywater contains, which plants are appropriate targets, what the law allows, and what practices prevent the water quality and health problems that unsafely applied greywater can cause.
