Every public data breach

Disclosed this week47On record26,367

47 disclosed this week · 26,367 on record

Alameda-Contra Costa Transit District

Disclosed Mar 11, 202138,234 affectedConfirmed

Official notice

What is known

People affected38,234 (as reported by the organization)
DisclosedMar 11, 2021
HappenedApr 7, 2020
AttackNot stated
Data exposedNot stated
SectorEducation · US
StatusConfirmed

Sources

Official noticeoag.ca.gov
California Attorney General breach notice: Alameda-Contra Costa Transit District
Official noticein.gov
Indiana Attorney General 2021 data breach report: Alameda-Contra Costa Transit District

Notices filed

Residents of INMar 11, 2021
Indiana AG3 people
Residents of CAMar 15, 2021
California AGCount not stated
History of this record
records_basis2026-09-25
empty to organizationby backfillSource
records2026-09-25
empty to 38234by backfillSource
disclosed2026-09-25
2021-03-15 to 2021-03-11by 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.

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