Sonoma Valley Healthcare District

Disclosed Dec 9, 202069,000 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	NamesHealth
Sector	Healthcare · US
Status	Confirmed

Sources

Official noticeoag.ca.gov

California Attorney General breach notice: Sonoma Valley Healthcare District

Official noticeocrportal.hhs.gov

HHS OCR breach report (archive, resolved): Sonoma Valley Healthcare District (Healthcare Provider, CA)

Notices filed

Residents of CADec 9, 2020

California AGCount not stated

TotalDec 9, 2020

HHS archive69,000 people

History of this record

attack2026-09-25

unknown to hackingby backfillSource

data_types2026-09-25

[] to ["names","health"]by backfillSource

records_basis2026-09-25

empty to hhsby backfillSource

records2026-09-25

empty to 69000by backfillSource

summary2026-09-25

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,by backfillSource

Added2026-09-25

First recordedby backfillSource

First seen 2026-09-25 (California AG), confirmed by California AG. Record counts are as reported. Not legal advice.

Everything about Sonoma Valley Healthcare District