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Sanitation Sewer

A sanitary sewer system collects and transports waste from indoor plumbing fixtures to treatment plants. The Sanitation Sewer division reviews and issues permits related to sanitation and sewer systems for properties in unincorporated Sonoma County.

Septic System Information

In areas where public sewer is not available, homeowners must have septic systems installed on their property that will treat wastewater coming from their home.


Sonoma County Water Agency's Sewage Emergency Hotline: (707) 523-1070

This division handles the following permitting activities and services. Please contact Permit Sonoma to discuss sewer and sanitation permitting requirements.

  • Sewer and Water System Permits
    • Residential
    • Subdivisions
    • Commercial
    • Industrial
  • Sewer and Water System Repair Permits
  • Sewer and Water Systems Record Drawings
  • Sanitation District Record Drawings
  • Annexation Applications for Outside Service Areas
  • Sewer Inspections

Sanitation Codes & Standards

Codes set forth uniform requirements for contributors to the wastewater collection and treatment systems.