Mater Dei High School

Mater Dei High School notified California AG on Aug 30, 2021 of a data breach, which occurred on Mar 4, 2021. Data exposed: Social Security number, Passport number, Financial / bank account, Medical / health information, Health insurance, Usernames / passwords, Postal address, Name.

Case file (dates, days to notice against the statute, what the letter offers, prior incidents)

Organization: Mater Dei High School
Source: California AG · source record
Date reported: Aug 30, 2021
Date(s) of breach: Friday, January 1, 2021Thursday, March 4, 2021
Residents affected: Not published by this source
Data exposed: Social Security number Passport number Financial / bank account Medical / health information Health insurance Usernames / passwords Postal address Name
Notice letter: Sample notice (PDF)
Discovered: June 2021, as stated in the letter
"This investigation concluded early June 2021, and it determined that your personal information was within one of the compromised accounts."
Days to notice: 179 days from the end of the breach window (Mar 4, 2021, no discovery date in the letter) to the California record (Aug 30, 2021). Statute: 30 days from discovery or notification of the breach (Cal. Civ. Code § 1798.82).
Third party: The letter attributes the incident to a vendor or service provider
First seen by BreachTally: 2026-10-30 16:05 UTC

Dates and counts as filed by the organization with the agency. The breach window and the report date often differ by months.

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Data reproduced from a public government filing. Spot an error? Email support@breachtally.com with the record link. Corrections are applied and noted.