Florida passed a statue that provides up to a 35% density increase in a development if a greywater system is installed and reduces potable water requirements.
Installers
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Sonoma County
While Sonoma County does not have a program, they do have information on their website about greywater to help residents of the county install a system.
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FAQs from San Francisco Water, Power, Sewer
(This FAQ is from the SFPUC’s website here.
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California Plumbing Code
In California cities, graywater is regulated under Chapter 15 of the plumbing code. (For sites outside of city limits, the county department of environmental health typically regulates graywater.) Chapter 15 of the 2025 California Plumbing Code can be viewed here.
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Graywater Manual from SFPUC
This manual provides general greywater info plus step-by-step design and installation instructions for the laundry-to-landscape (L2L) system. Most of the information if useful for other places, particularly the construction portion. However, the plant water requirement section is based on San Francisco weather and so would need to be adapted to be used in other climate…