First, what is gray water?
Gray water is all the non-toilet wastewater produced in the average household including the water from bathtubs, showers, sinks, washing machines, and dishwashers. Although gray water does not need extensive chemical or biological treatment before it can be used in the garden as irrigation water, it still must be used carefully because it usually contains grease, hair, detergent, cosmetics, dead skin, food particles and small amounts of fecal matter. How much gray water can be used in the home garden? First, collect only as much wastewater as you will need to meet the water requirements of your garden. The rest should go into your sewer or septic system. A good rule-of-thumb for deciding how much gray water to use on your garden is that a square foot of well-drained, loamy soil can handle about a half gallon of gray water per week. In other words, if your garden area is 500 square feet, then you can put up to 250 gallons of gray water on your garden each week. If you can be choosy abou
