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Graywater Systems

Alternate Water Sources Working Group

The Alternate Water Sources Working Group, which includes Permit Sonoma staff, convenes quarterly for speaker presentations and conversations on topics of water efficiency, conservation and reuse.

Find Out More

Meeting on September 18, 2018

What is Graywater?

Graywater is wastewater collected from showers, bathtubs, bathroom sinks, and clothes washing machines. Graywater does not include water from toilets, kitchen sinks, or dishwashers. Graywater can be routed to your landscape to help meet your irrigation needs.

Types of Systems

There are three types of graywater systems. They are listed below along with permit requirements.

Please contact the Well & Septic division with questions about permitting for graywater systems.

  • Clothes Washer System

    • Septic permit: Not required
    • Building (plumbing) permit: Required
  • Simple System*

    • Septic permit: Required
    • Building (plumbing) permit: Required
    • Design review and inspection: Required
  • Complex System*

    • Septic permit: Required
    • Building (plumbing) permit: Required
    • Design review and inspection: Required

*These types of graywater systems are not fully covered on this website.

Contact Information

Contact Well & Septic by Phone
2550 Ventura Avenue
Santa Rosa, CA 95403
38.465074, -122.723705

Onsite Wastewater Treatment Systems

Find out about Onsite Wastewater Treatment Systems (OWTS). OWTS

Graywater Related Links

Graywater Chapter 15
Graywater regulations per the California Plumbing Code.

Sonoma County Water Agency
Graywater information from the Sonoma County Water Agency.

Local Building Contact
Contact your local building official for plumbing permit requirements.

Apply for Financing

Make Energy and Water Improvements to your Home or Business

Sonoma County Energy Independence Program

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Your local alternative to start saving now!