Permit and Resource Management Department Banner

Graywater Systems

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
38.465225, -122.723293

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.

Funding Assistance
The Sonoma County Energy Independence Program (SCEIP) offers property owners the opportunity to finance energy efficient property improvements through the property tax system

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

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