Sonoma County Sanitation Districts and Zones represents parcels which reside within the 11 districts and/or zones within the County of Sonoma. The data layer is parcel specific therefore, there is no formal boundary. Parcels granted an outside sewer service area agreement (a.k.a OSAA) within any sanitation district and/or zone are not considered "in" the respective district and/or zone. OSAA's are included for tracking purposes only. ("Sanitation District" defined as a body corporate and politic, organized and existing under and by virtue of the laws of the State of California yet owned by the State and OPERATED under Sonoma County Water Agency. "Sanitation Zone" defined as a body corporate and politic, organized and existing under and by virtue of the laws of the State of California yet owned by Sonoma County Water Agency.)

Sonoma County Sanitation Districts and Zones represents parcels which reside within the 11 districts and/or zones within the County of Sonoma. The data layer is parcel specific therefore, there is no formal boundary. Parcels granted an outside sewer service area agreement (a.k.a OSAA) within any sanitation district and/or zone are not considered "in" the respective district and/or zone. OSAA's are included for tracking purposes only. ("Sanitation District" defined as a body corporate and politic, organized and existing under and by virtue of the laws of the State of California yet owned by the State and OPERATED under Sonoma County Water Agency. "Sanitation Zone" defined as a body corporate and politic, organized and existing under and by virtue of the laws of the State of California yet owned by Sonoma County Water Agency.)