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To keep your plants healthy, it is best to avoid soap with the following ingredients:
In general, liquid soaps are better than powder soaps. For more information about soaps, see the Harvesting Grainwater website.
A good place to start is the Santa Cruz County Planning Department and search for greywater in their custom search tool. Look at the Permit Requirements (PDF) first.
Professional help: You can also request a professional graywater consultation from a member of the Central Coast Graywater Alliance to help you design your system.