Connections to the new sewer system require the following permits. All permits must be obtained prior to start of work and final approval of work will be required prior to final occupancy of any related building permit.
- A Sewer Construction permit is required to install a sewer line from the building to the sewer lateral or main line. If any work in the right-of-way is necessary then a separate Encroachment permit is also required. The sewer construction permit authorizes sewer work, such as the installation of pipes and cleanouts, to connect to the sewer system and is subject to Sonoma Water standards. The encroachment permit authorizes work in the right-of-way, such as pavement cuts and restoration, and is subject to DTPW standards and the One Pave program.
- A Septic Tank Destruct permit is required to destruct or remove existing septic tanks and for the abandonment of existing septic systems which is requirement to connect to the new sewer system.
- A Sewer Fee Only permit is required for the assessment and collection of any required connection and service fees. This permit is required to obtain sewer service.
More information regarding Sonoma Water’s Larkfield Estates Sewer project.
The county has adopted a OnePave Program intended to provide better-quality, longer lasting roads and facilitate rebuilding efforts specific to the fire damaged areas of Larkfield-Wikiup where a high concentration of utility and other infrastructure work for individual rebuilding projects is anticipated to result in extensive trenching in the area’s roadways.
Larkfield Estates Holding Tank Option
View the Larkfield Estates Subdivision Zone Map
Due to the unprecedented fires that devastated our community in October 2017, Larkfield Estates property owners are challenged with rebuilding, including the best way to manage wastewater. Lots in the subdivision have varying types of septic systems. Many of the properties have serviceable septic systems that can accommodate reconstruction. Other parcels have systems that could support redevelopment but not to the scale at which owners are allowed to rebuild under existing zoning regulations. Some sites have failed systems that need to be replaced.
To provide another option to fire survivors, the Sonoma County Water Agency will consider extension of sewer service to the subdivision. For those owners who wish to connect their properties to the sewer main (which, if approved, will take at least a year to authorize and construct) and proceed with reconstruction, Permit Sonoma would allow the use of holding tanks as an interim measure. Properties with compliant septic systems will not be compelled to connect to new main.
In providing this option Permit Sonoma does not take a position on whether owners should connect their properties to the sewer system, if approved and constructed. The agency takes this action regarding holding tanks to provide another option for fire survivors trying to rebuild on or sell their properties.
Regulations allow the use of holding tanks under certain conditions. Sonoma County Code Section 713.9 provides, “No privy [holding tank], including vault privies, chemical privies, pit privies or cesspools shall be constructed, maintained or used except upon written approval of the Director of the Permit and Resource Management Department (Permit Sonoma) unless otherwise specifically permitted by law.” The Regional Water Quality Control Board Basin Plan provides for the use of holding tanks if the proposed use is in a sewer service area, sewer service extension is underway and will be completed in two years, and the treatment plant has capacity to meet the proposed users’ needs.
Permit Sonoma will track the use of holding tanks through building permit applications. No additional permits will be required. For the best use of holding tanks, please visit or contact the Resiliency Permit Center at:
2550 Ventura Avenue
(former Hearing Room)