City of San Mateo Law Library
City of San Mateo Municipal Code.


Graywater systems promote the efficient use of water and are encouraged to assist in on-site landscape irrigation. All graywater systems shall conform to the California Plumbing Code (Title 24, Part 5, Chapter 16) and any applicable local ordinance standards. Refer to Section 23.72.010(e) for the applicability of this chapter to landscape areas less than 2,500 square feet with the estimated total water use met entirely by graywater.