The personal data of 2,347 clients of three Sonoma County agencies may have been exposed during a breach of a county contractor’s network, county officials said Wednesday.

An August ransomware attack on the network of Seneca Family of Agencies may have exposed vital personal data including names, social security numbers, addresses, phone numbers, diagnosis, and treatment information, the county said.

Seneca provides mental health, counseling, and family engagement services for the county Human Services Department, Health Services Department, and Probation Department.

The county said 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.