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Septic Site Evaluations

In response to the current shelter in place order, Permit Sonoma has modified the process and procedures for septic site evaluations (soil profile evaluations/pre-percs, percolation testing, and groundwater determinations).  Septic professionals are expected to abide by the procedures below. Non-compliance with these procedures may result in processing delays or denials of Well and Septic Service (WSR) applications and/or future OWTS Applications.


  1. Apply for a septic site evaluation. Ensure a complete septic site evaluation application is submitted electronically to Permit Sonoma. (Note: Any paper applications that were submitted prior to the shelter in place order must be submitted electronically.)
  2. Receive confirmation of an accepted application.  After a complete application is submitted and fees have been paid, you will receive notification with the permit number related to the septic site evaluation activity. The permit number will start with “WSR” followed by the two-digit year, a hyphen, and four digits (e.g. WSR12-3456) and will be used to request inspections and track progress.
  3. Request an inspection. Request a virtual inspection to schedule a date and time to conduct the septic site evaluation with Permit Sonoma staff which will perform field work remotely using VuSpex video inspections.
  4. Perform the septic site evaluation.  Septic professionals performing septic site evaluations must comply with all applicable provisions of the county’s OWTS Manual (site evaluation and OWTS design criteria) as well as use and adhere to requirements of the following applicable forms:
    1. WLS-039 Soil Profile Evaluation Form (PDF)
    2. WLS-040 Soil Percolation Test Data Form (PDF)
    3. WLS-041 Wet Weather Ground Water Determination Form (PDF)

    Exceptions to the instructions in the forms include:
    1. Scheduling the field work with staff instead of independently performing the site evaluation work, and
    2. Submitting the completed forms for staff review and approval instead of submitting the forms with a future septic permit application.
  5. Submit applicable forms.  Within 30 days after the septic site evaluation work is completed, septic professionals must submit the applicable completed forms noted above for review and completion of the WSR. Forms can be uploaded electronically through Permits Online using the “View My Records” icon, logging in, and searching for your permit number.

    A complete and approved WSR will be required as part of future OWTS Applications for new or replacement septic systems.  Permit Sonoma will not accept any independent septic site evaluation work that is not related to an approved WSR.

Contact Information

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

Well & Septic Maps

Well & Septic Districts Map

Well and Septic Districts Map

Map of Well & Septic's environmental health districts within Sonoma County.