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  • Published on August 16, 2019

    As of August 15, 2019, the Sonoma County Onsite Wastewater Treatment System (OWTS) Manual version 7.0 is in effect.  Customers are hereby advised that any septic applications will be required to comply with the provisions of the OWTS Manual version 7.0.  Customers are further advised of the following updates to Permit Sonoma’s permitting procedures...

  • Published on August 13, 2019

    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.

  • Published on July 9, 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.

  • Published on March 28, 2019

    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 2nd must be submitted by 12:00 noon Friday, March 29th.

  • Published on November 19, 2018

    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.

  • Published on August 24, 2018

    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.

  • Published on May 1, 2018

    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).

  • Published on January 18, 2018

    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.

  • Published on September 28, 2017

    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.

  • Published on September 21, 2017

    This month, the EPA held its annual SepticSmart Week with outreach activities to encourage homeowners and communities to care for and maintain their septic systems. Here are SepticSmart’s top 5 tips…

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2550 Ventura Avenue
Santa Rosa, CA 95403
38.465074, -122.723705