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  • Published on June 2, 2021

    The dry weather season for well yield testing opened June 1, 2021 and soil mottling is now authorized as a substitute for groundwater determinations.

  • 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 March 6, 2019

    Due to the County's flood recovery efforts, the Board of Supervisor item for consideration of the proposed Onsite Waste Treatment Systems (OWTS) Manual has been postponed to May 21, 2019. We apologize for the inconvenience.
    Background: In order to meet State mandated regulations, the County of Sonoma is updating our OWTS Manual. This Manual outlines County regulations and standards for septic systems.
    More Information about the Update of the OWTS Manual

  • 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.

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