County Administrator's Office
For Immediate Release

County of Sonoma contractor discloses data breach impacting 1,364 clients receiving county services

Santa Rosa,CA | November 24, 2021

(Note: This press release has been updated to correct the number of people impacted by this data breach. The number has been downgraded by Seneca to 1,364.)


Seneca Family of Agencies, a contractor providing family services for the County of Sonoma, is offering credit monitoring and identity protection services to 1,364 county clients whose personal data may have been exposed during a breach of the contractor’s network.


Seneca Family of Agencies is sending notification letters to county clients this week disclosing the scope of an August 2021 ransomware attack and outlining protective measures available to county clients.


Seneca provides mental health, counseling and family engagement services for the county Human Services Department, Health Services Department and Probation Department. The type of information that may have been exposed on its network includes name, Social Security number, address, phone number, email address, medical record number, diagnosis/treatment information, health insurance information, Medicare/Medicaid number, provider name, prescription information, driver’s license/state identification number, and digital signature.


No County of Sonoma computer systems were attacked or compromised during the incident. The county took immediate action to secure clients’ data when it was notified of the breach.


There is no evidence that clients’ personal data has been misused as a result of the breach, but as a precaution Seneca is notifying county clients whose data was stored on its network. More information about the data breach is available at the Seneca website.


Seneca is providing potentially impacted individuals with 12 months of free credit monitoring and identity protection services. To enroll, call 855-675-2841 Monday through Friday (except U.S. holidays), from 6 a.m. to 6 p.m. You may also write to Seneca at 8945 Golf Links Road, Oakland, CA 94605.