Sonoma Valley Healthcare District
Disclosed Dec 9, 20205 years ago69,000 affectedConfirmed
The covered entity (CE), Sonoma Valley Healthcare District, reported that it was the subject of a ransomware attack that affected the protected health information (PHI) of 69,000 individuals. The PHI involved included names, dates of birth, addresses, claims information, diagnoses, lab results, and other treatment data. The CE notified HHS, affected individuals, the media, and provided substitute notice. In response to the breach, the CE implemented additional administrative, technical, and security safeguards to better protect its PHI. As part of the investigation, OCR provided technical assistance to the CE regarding the HIPAA Rules.
What is known
| People affected | 69,000 (as reported to HHS) |
|---|---|
| Disclosed | Dec 9, 2020 |
| Happened | Sep 10, 2020 |
| Attack | Hacking |
| Data exposed | Names, Health |
| Sector | Healthcare · US |
| Status | Confirmed |
Sources
| Source | |
|---|---|
| California Attorney General breach notice: Sonoma Valley Healthcare Districtoag.ca.gov · Official notice | Official notice |
| HHS OCR breach report (archive, resolved): Sonoma Valley Healthcare District (Healthcare Provider, CA)ocrportal.hhs.gov · Official notice | Official notice |
Notices filed
| Where | Filed | People |
|---|---|---|
| California AGresidents of CA | Dec 9, 2020 | |
| HHS archivetotal | Dec 9, 2020 | 69,000 |
History of this record
- 2026-09-25 · attack: unknown to hacking · backfill source
- 2026-09-25 · data_types: [] to ["names","health"] · backfill source
- 2026-09-25 · records_basis: empty to hhs · backfill source
- 2026-09-25 · records: empty to 69000 · backfill source
- 2026-09-25 · summary: empty to The covered entity (CE), Sonoma Valley Healthcare District, reported that it was the subject of a ransomware attack that affected the protected health information (PHI) of 69,000 individuals. The PHI involved included names, dates of birth, · backfill source
- 2026-09-25 · added · backfill source
First seen 2026-09-25 (California AG), confirmed by California AG. Record counts are as reported. Not legal advice.