Gray water can be applied to landscape plants as it is generated, or it can be stored on in suitable sized containers. Short-term storage will allow suspended matter to settle. It may be practical to pump large quantities of gray water onto the landscape as needed in dry weather. For health reasons, gray water should not be sprayed into the air or applied directly to plant materials. Apply gray water at or slightly below the soil surface under the plants.
Surface broadcasting by soaker hoses or a similar trickle system is recommended.
Apply the gray water slow enough to prevent runoff. Excess applications can also result in soil erosion and contamination of existing water supplies. Gray water has few long-term effects on soil. Gray water slightly modifies soil-organism populations but causes no pest problems. Continued application of gray water to the same area or plants should be avoided.