Greywater is the water that comes out of the drains of showers, baths, sinks, and washing machines and is distinctly different from black water, which is what gets flushed down the toilet. Greywater can be used for watering houseplants, landscaping, or even flushing the toilet, so it’s a resource we can use twice. 


There are some graywater systems that will require a permit so make sure to check out California’s greywater code found in Chapter 15 of the California Plumbing Code:


Below is a list of resources for information on how to start using Graywater.