Greywater System Requirements – L2L Rebate

  • Greywater must be distributed at least: 
    • 18 inches from the property line;
    • 2 feet from buildings; 
    • 50 feet from any septic tank or leach field; and 
    • 100 feet from wells, waterways, or other water sources. 
  • Greywater piping/tubing and the diverter (3-way) full-port ball valve shall be the same diameter as or larger than the clothes washer drain hose. Typically, 1-inch diameter
  • The end of the main-line tubing shall be left fully open (allow a continuous unobstructed greywater route from the clothes washer to the landscape; never use a valve or plug on the distribution point furthest away from the clothes washer.)
  • The greywater system shall: 
    • Not include a potable water connection, filters, nor a pump. (Note: The pump in a clothes washer is not considered part of the greywater system.) 
    • Not connect to overhead (spray) irrigation. The system cannot connect to a conventional irrigation system. 
    • Be designed to prevent clogging of any emitters. 
    • Be designed and installed to prevent contact with humans and pets. 
    • Be labeled with, “Caution: Non-potable greywater. Do not drink. 
    • Include a diverter (3-way) full-port ball valve to allow the user to direct the flow of greywater between the greywater system and the sanitary sewer/septic system. Include an auto vent (or an in-line vent or an air-admittance valve). 
  • The diverter valve and auto vent assembly: 
    • Must be installed at least 6 inches above the flood rim (typically the top) of the clothes washer. 
    • Must be easily accessible and labeled. Labeling shall indicate which direction to turn the diverter valve’s handle to send greywater to either the landscape or the sanitary sewer/septic system, respectively. The diversion valve must be clearly labeled and easily accessible. 
    • Shall be used to direct to the sanitary sewer/septic system all wastewater derived from activities that could create health issues. These activities include, but are not limited to: 
      • Washing diapers or similarly soiled garments, 
      • Washing greasy or oily rags, 
      • Cleaning car parts, 
      • Disposal of waste solutions from photo labs, and 
      • Other activities that contain hazardous chemicals. 
  • Any perforations in the building created during installation are properly sealed or patched.
  • Greywater systems are not suitable for lawns, small or potted plants, raised beds, pH-sensitive plants, established never irrigated plants, very low water use plants, and edible gardens.
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