The Director of Permit Sonoma hereby adopts the County of Sonoma’s Onsite Wastewater Treatment System (OWTS) Manual, version 7.0, dated August 15, 2019.

As of July 12, 2019, Permit Sonoma will be changing how fees are assessed for encroachment permit applications and septic permit applications to be more consistent with how we assess fees for other types of similar construction permit applications.

Permit Sonoma is closed for the Cesar Chavez holiday and wet weather testing cannot be scheduled for that day. Forms and payments for testing on Tuesday, April 2^nd must be submitted by 12:00 noon Friday, March 29^th.

Well & Septic will not be conducting inspections on Wednesday, November 28 or Thursday, November 29, 2018 due to an all-staff training. No Well & Septic inspection appointments will be available on those dates. We apologize for any inconvenience.
All other inspections (e.g. Building or Engineering inspections) will proceed as usual.

The County of Sonoma is updating County regulations for septic systems in order to meet state mandated regulations that protect water quality and public health. Permit Sonoma invites the public to attend upcoming community meetings to share feedback on the proposed Onsite Wastewater Treatment System (OWTS) Manual.

The Sonoma County Board of Supervisors will be considering the revised onsite waste treatment systems (OWTS) manual at an upcoming meeting on May 22, 2018. If the Board approves the revision, the County will then submit a revised Local Area Management Program (LAMP) and OWTS Manual to the North Coast Regional Water Quality Control Board (NCRWQCB).

Use this document to evaluate the condition and location of septic systems for the purpose of rebuilding structures destroyed by the Sonoma Complex Fire and to determine the capability of septic systems county-wide to support temporary housing.

Find out what you need to know about dry weather testing for wells in water scarce areas, including the application process and upcoming testing closure dates.