- The groundwater has to be at least five feet below the surface of your land. And make sure that gray water you use doesn’t sit on the surface or puddle, where it can run off your property rather than sinking through the soil.
- Think about what goes into your gray water - because that’s what’s going into your lawn. Instead of phosphates, chlorine bleach, ammonia, and other harsh chemicals, use the healthy, natural cleaning alternatives mentioned in this chapter.
- Because gray water may contain micro-organisms, use care when handling it - wear rubber gloves or wash your hands afterwards. (That said, the risk is small; there’s no documented case in the U.S. of someone getting sick from touching gray water.)
- Don’t reuse gray water that has been in contact with dirty diapers, raw meat, or poultry. If someone in your house is sick, put off reusing gray water until they’re healthy.
- Don’t use gray water on plants where the water may get on fruits or vegetables. (Citrus and nut trees are generally okay, though.)
- If children play on the grass, don’t use gray water to surface-water your lawn. Instead, look into getting a subsurface irrigation system, which uses underground pipes to deliver water to the plants’ roots.
- Gray water isn’t suitable for sprinkler systems and spray nozzles on hoses because any microbes in the water may become airborne and get inhaled.
- Clearly label any pipes and hoses that carry gray water - you don’t want to accidentally take a drink from the wrong hose on a hot day!
- Don’t store gray water (say in a rain barrel behind the garage) because any micro-organisms it contains can multiply and contaminate the water.