Watering fruit trees with greywater is generally acceptable. There are several factors to consider when using greywater for irrigating. Before you start, check your local plumbing code or with the code authorities for any restrictions or guidelines that apply to greywater use in your area. Some municipalities encourage greywater recycling, while others may not even be familiar with it. These standards do not allow the use of greywater for irrigation if there is the possibility of ground water contamination or where soil conditions are unsuitable for proper drainage.
Many household cleaners contain plant nutrients such as phosphorous and potassium.
Some cleaners such as powdered laundry detergents, however, have high levels of sodium. A high sodium level in greywater can cause drainage problems and poor growth of plants. Cleaners containing boron should not be used, since it is toxic to most plants. Depending on the type of cleaners used, greywater may also be alkaline. While some plants tolerate a high soil pH, others do not.