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Contra Costa County

Contra Costa County Vendor Cyber Rating & Cyber Score

ca.gov
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ISO 27001
SOC 2 Type 1
SOC 2 Type 2
PCI DSS
HIPAA
GDPR

The County of Contra Costa is home to approximately 1,094,000 residents, and was incorporated in 1850 as one of the original 27 counties of the State of California. It is one of the nine counties in the San Francisco-Oakland Bay Area. The County is the ninth most populous county in California. MISSION Contra Costa County is dedicated to providing public services which improve the quality of life of our residents and the economic viability of our businesses. VISION Contra Costa County is recognized as a world-class service organization where innovation and partnerships merge to enable our residents to enjoy a safe, healthy and prosperous life. VALUES Contra Costa County serves people, businesses and communities. Our organization and


CCC A.I CyberSecurity Scoring

Incident Details
CCC
Company Information
Website:https://www.contracosta.ca.gov/361/Human-Resources
Employees number:5,141
Number of followers:22,269
NAICS:92
Industry Type:Government Administration
Homepage:ca.gov
Cyber Premium EstimationGet Supply Chain
CCC Risk Score (AI oriented)
Between 650 and 699
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CCCGovernment Administration
Updated:
30/03/2026
658/1000
Weak
B
AaaAaABaaBaBCaaCaC
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CCC Global Score (TPRM)
xxxx
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CCCGovernment Administration
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Score locked
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Vulnerabilities
Benchmark vs. industry & size peers
Findings

CCC
CCCWeak
Current Score
658B (WEAK)
01000
4 incidents
0 avg impact
Incident timeline with MITRE ATT&CK tactics, techniques, and mitigations.
JULY 2026
665Before Incident
JUNE 2026
664Before Incident
MAY 2026
662Before Incident
APRIL 2026
660Before Incident
MARCH 2026
657Before Incident
FEBRUARY 2026
656Before Incident
JANUARY 2026
654Before Incident
DECEMBER 2025
650Before Incident
NOVEMBER 2025
649Before Incident
OCTOBER 2025
648Before Incident
SEPTEMBER 2025
645Before Incident
AUGUST 2025
643Before Incident
SEPTEMBER 2022
602Before Incident
Breach
01 Sep 2022 • CCC
County of Contra Costa

Contra Costa County Data Breach (September 2022)

520After Incident
HIGH-82
CON1903419111925
The County of Contra Costa experienced a data breach in September 2022 due to a phishing attack targeting two employee email accounts. Unauthorized parties potentially accessed sensitive personal information stored in emails and attachments. The breach affected 15,591 individuals, primarily residents with California mailing addresses, who received notification letters in May 2023. The exposed data led to risks of identity theft and fraud, prompting a class-action lawsuit alleging inadequate security measures. The county settled, offering affected individuals up to $5,500 in compensation (covering out-of-pocket expenses, lost time, and extraordinary fraud-related costs) and two years of credit monitoring. While the county denied liability, the incident highlighted vulnerabilities in handling employee-managed sensitive data, with potential long-term reputational and financial repercussions for victims.
INCIDENT DETAILS -
TYPE
Data BreachPhishing
MOTIVATION
Likely Financial Gain (Data Theft/Exploitation)
IMPACT
Settlement Fund: Undisclosed (covers claims up to $5,500 per person + credit monitoring)Attorneys Fees: $150,000 (max)Class Representative Award: $2,500 (max)Administration Costs: To be determinedEmailsAttachments (likely containing PII)2 Employee Email AccountsCustomer Complaints: Class action lawsuit filed (15,591 affected individuals)Brand Reputation Impact: Negative (public disclosure, lawsuit, settlement)Legal Liabilities: Class action settlement (financial compensation + credit monitoring)Identity Theft Risk: High (PII exposed; claims include identity theft/fraud expenses)Payment Information Risk: Potential (if attachments contained financial data)
DATA BREACH
Personally Identifiable Information (PII)EmailsAttachmentsNumber Of Records Exposed: 15,591 individualsSensitivity Of Data: High (PII, potential financial/health data in emails)Data Exfiltration: Likely (unauthorized access to emails/attachments)EmailsAttachments (e.g., PDFs, documents)NamesAddressesPotentially: SSNs, financial data, health data (if included in emails)
REFERENCES
Blog URLSource URL
JUNE 2022
660Before Incident
Breach
16 Jun 2022 • CCC
County of Contra Costa, California

Data Breach at County of Contra Costa

594After Incident
HIGH-66
CON557072725
The California Office of the Attorney General reported a data breach involving the County of Contra Costa on May 11, 2023. The breach occurred on September 19 and 20, 2022, due to an email phishing incident that potentially exposed personal information, including names, Social Security numbers, and medical information, although the exact number of individuals affected is unknown.
INCIDENT DETAILS -
TYPE
Data Breach
IMPACT
NamesSocial Security numbersMedical information
DATA BREACH
NamesSocial Security numbersMedical informationSensitivity Of Data: High
REFERENCES
Blog URLSource URL
AUGUST 2021
702Before Incident
Breach
01 Aug 2021 • CCC
Contra Costa County

Contra Costa County Email Breach

636After Incident
CRITICAL-66
CON223718522
An unauthorized party accessed certain employee email accounts of Contra Costa County in a computer breach. The emails had the attachments containing information including Social Security numbers; driver's license or state-issued identification numbers; financial account numbers; passport numbers; and medical information and/or health insurance information of certain county employees, as well as individuals who communicated with the county's Employment and Human Services Department. The County officials investigated the incident and notified the impacted individuals and offered them complimentary credit monitoring.
INCIDENT DETAILS -
TYPE
Data Breach
IMPACT
Social Security numbersDriver's license or state-issued identification numbersFinancial account numbersPassport numbersMedical informationHealth insurance informationSystems Affected: Email Accounts
DATA BREACH
Social Security numbersDriver's license or state-issued identification numbersFinancial account numbersPassport numbersMedical informationHealth insurance informationSensitivity Of Data: HighPersonally Identifiable Information: Yes
REFERENCES
Blog URLSource URL
JUNE 2021
771Before Incident
Breach
24 Jun 2021 • CCC
Contra Costa County

Unauthorized Access to Employee Email Accounts

700After Incident
HIGH-71
CON503080425
The California Office of the Attorney General reported that Contra Costa County experienced unauthorized access to employee email accounts between June 24, 2021, and August 12, 2021. The incident was reported on April 15, 2022, but the number of individuals affected and the specific types of personal information compromised remain unknown.
INCIDENT DETAILS -
TYPE
Unauthorized Access
IMPACT
Systems Affected: Employee Email Accounts
REFERENCES
Blog URLSource URL

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