1. (a) Trees and fruit trees;
2. (b) Bushes, shrubs, and vines;
3. (c) Larger perennials and annuals; and

4. (d) Food crops for which the graywater will not come into contact with the edible portion of the plant.

   9.2. Graywater Incompatible Plants.

5. (a) Acidic soil-loving plants;

6. (b) Seedlings or young plants.

   9.3. Graywater Irrigation Issues.

   Graywater can clog drip systems without proper filtration and regular maintenance. Either remove solid particles from the water (by filtering or settlement) or increase the diameter of the holes in the irrigation pipe. It is recommended that drip irrigation hoses with small outlets not be used for graywater irrigation unless the solid particles have been removed.

   9.4. Maintaining Graywater Irrigation Zones.

   It may be necessary to replace mulch, flush soil with potable or fresh water periodically during extended periods of no rain in order to disperse minerals, such as salts from building up. Check for these issues and adjust graywater output accordingly:

7. (a) Unusual odors;
8. (b) Clumping of soil;
9. (c) Poor vegetation growth;
10. (d) Presence of damp or boggy ground after irrigation, or soil is excessively damp with signs of surface ponding and run-off;
11. (e) a fine sheet of clay covering the surface; or

12. (f) evidence of pests and diseases on plants.

    APPENDIX B. INSPECTION AND MAINTENANCE SCHEDULE.

    TABLE 10Graywater System Inspection and Maintenance FrequencyInspection and Maintenance ItemFrequencyInspect and clean filters and screens, replacing where necessaryEvery 3 months

    Inspect and verify that disinfection, filters, and water quality treatment devices and systems are operational and maintaining minimum water quality requirementsIn accordance with manufacturer's instructions and the regulatory authorityInspect pumps and verify operationAfter initial installation and every 12 months thereafterInspect valves and verify operationAfter initial installation and every 12 months thereafterInspect pressure tanks and verify operationAfter initial installation and every 12 months thereafterInspect and clear debris from storage tanks, locking devices, and verify operationAfter initial installation and every 12 months thereafterInspect caution labels and markingsAfter initial installation and every 12 months thereafterInspect for cross-connections and test entire systemAfter initial installation and every 12 months thereafterInspect and maintain mulch basinsAs needed to maintain mulch depth and prevent ponding and runoff

APPENDIX A. RECOMMENDED BEST MANAGEMENT PRACTICES.

The use of plant friendly products is important when using graywater for irrigation. Products should be salt and borax free in addition to being biodegradable and non-toxic. Plant friendly products are key when reusing graywater. Chlorine bleach can be harmful to plants and should be diverted to your sewer system. Hydrogen peroxide based products can be used instead of bleach. The pH of your graywater also needs to be considered. Most soaps do not change the pH but some do. Liquid soaps typically do not change the pH of graywater. Bar soaps can make the water very basic. Choosing plants that are not affected by pH is best if you are not sure if the pH is being affected by the products you typically use. Graywater systems are not maintenance free and require consistent and frequent inspection by the owner to ensure proper functionality.

9.1. Graywater Compatible Plants.

KEY: wastewater, graywater, drip irrigation

Date of Last Change: May 1, 2024

Notice of Continuation: April 1, 2024

Authorizing, and Implemented or Interpreted Law: 19-5