Rainwater / Greywater Workshops

Click HERE for our 2018 Rainwater / Greywater Class Calendar!

Rainwater / Greywater Workshops

West Basin's Rainwater/Greywater Workshops will teach residents about the benefits of capturing rainwater and utilizing greywater for outdoor irrigation. Residents will learn how to safely and legally reuse greywater from clothes washing machines, as well as how to harvest rainwater with rain barrels and cisterns. Rain barrels and larger cisterns help residents to collect and reuse rainwater from roofs and gutters, retaining water on-site, and reduce the amount of pollutants that flow into storm drains and local waterways. Every gallon of rainwater that is collected in rain barrels saves one gallon of drinking water that would normally be used for irrigation.










Laundry-to-Landscape (L2L) Greywater Workshops

Given the recent demand for easy and convenient strategies by our cities and retailers to conserve water, West Basin is now offering free Greywater Workshops taught by greywater industry experts. During these workshops, attendees are able to obtain general knowledge about common types of systems, design considerations, plumbing codes affecting greywater, as well as resources that would be utilized for further research. Secondly, participants are introduced to the details of constructing an L2L system including an estimated efficiency of the system, installation, and the physical operation of the system. Finally, the workshops conclude with a hands-on and interactive exercise of putting together the components of the L2L system with instruction from a qualified industry professional, Laura Allen of Greywater Action. To enroll in these workshops, contact South Bay Environmental Services Center at (310) 371-4633. Please keep in mind that these courses reach capacity quickly. 


2018 Event Calendar and Registration

Advance registration for a Rainwater / Greywater class is required. To register for an upcoming event, please register online HERE. For any additional questions about the program, please call (310) 371-4633.


What is Greywater?

Greywater is used water from sinks, showers, baths and washing machines; it is not wastewater from toilets and can be safely used for outdoor irrigation! By re-using laundry water, residents can conserve water and reduce the energy, chemicals, and costs involved in treating water to drinking water (potable) quality.

The easiest way to utilize greywater is with a Laundry-to-Landscape (L2L) system. Creating a Laundry-to-Landscape greywater system in your home can play a critical role in drought resilience given its ease in both installation and maintenance. In efforts to reduce potable water use for irrigation purposes, there have been recent changes to the California Plumbing Code regarding gravity-fed greywater that make it easier for residents to create their own L2L system.


Basic Greywater Guidelines

Greywater is different from fresh water and requires different guidelines for it to be used safely:

  • Do not store greywater (more than 24 hours). If you store greywater the nutrients in it will start to break down, creating bad odors.
  • Minimize contact with greywater. Greywater could potentially contain a pathogen if an infected person’s feces entered into the water, so your system should be designed for the water to soak into the ground and not be available for people or animals to drink.
  • Infiltrate greywater into the ground, do not allow it to pool up or run off. Knowing how well water drains into your soil or the soil percolation rate of your soil will help with proper design. Pooling greywater can provide  mosquito breeding grounds, as well as a place for human contact with greywater.
  • Install a 3-way valve for easy switching between the greywater system and the sewer/septic.
  • Match the amount of greywater your plants will receive with their irrigation needs.

            More Information on Greywater


Program type: 
Contact Name: 
Gus Meza
Contact Email: 
Contact Phone: 
(310) 660-6209
West Basin Municipal Water District
South Bay Cities Council of Governments (SBCCOG)
Customer Type: