New Mexico Greywater Code

A remarkably simple code, for residences applying less than 250 gallons per day of graywater.

  • Aeration of graywater is not allowed.
  • Unlike some states mentioned later in this chapter, rather than specifying soil loading figures, New Mexico simply states „to ensure that the hydraulic capacity of the soil is not exceeded‟
  • Produce irrigation is not prohibited.

No permit is required.

Section 2. Section  NMSA 1978 (being Laws 1967, Chapter 190, Section 4, as amended by Laws 2001, Chapter 240, Section 1 and by Laws 2001, Chapter 281, Section 1)


shall not require a permit for applying less than two hundred fifty gallons per day of private residential gray water originating from a residence for the resident’s household gardening, composting or landscape irrigation if:

  1.  a constructed gray water distribution system provides for overflow into the sewer system or on-site wastewater treatment and disposal system;
  2. a gray water storage tank is covered to restrict access and to eliminate habitat for mosquitos or other vectors;
  3. a gray water system is sited outside of a floodway;
  4. gray water is vertically separated at least five feet above the ground water table;
  5. gray water pressure piping is clearly identified as a nonpotable water conduit;
  6. gray water is used on the site where it is generated and does not run off the property lines;
  7. gray water is applied in a manner that minimizes the potential for contact with people or domestic pets;
  8. ponding is prohibited, application of gray water is managed to minimize standing water on the surface and to ensure that the hydraulic capacity of the soil is not exceeded;
  9. gray water is not sprayed;
  10. gray water is not discharged to a watercourse; and
  11. gray water use within municipalities or counties complies with all applicable municipal or county ordina