Codes & Regulations

Please note that while this information is made available for your research use and convenience, it is not an official source for citation to the county code. Errors in electronic conversion or transmission are possible. To ensure that you are viewing the most recent update of a particular section, chapter, or title of the code, or to ask any questions, please contact the Snohomish County Code Reviser at 425-388-3494 or via email. Any person or entity that relies on information obtained from the system does so at his or her own risk.
  1. Snohomish County Code

  2. Development Code

  3. Engineering Design and Development Standards

    View the standards for engineering design in Snohomish County.

  4. PDS Rules

    Read specific detail for code sections or requirements.

  5. Code Interpretations

    View the rules of Unified Development Code.

  6. Shoreline Management Program

  7. SEPA

    Learn about the state's environmental review process, SEPA, including standards and forms.

  8. Comprehensive Plan

  9. Flood Hazard DFIRM

    This is the flood hazard maps update and adoption process.

  10. Water - Exempt Well Information

    Provide information on exempt wells in light of the recent Hirst Decision (Hirst v. Whatcom County)