Company Details
contra-costa-county
5,101
21,927
92
ca.gov
0
CON_1825550
In-progress

Contra Costa County Company CyberSecurity Posture
ca.govThe 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 each one of our employees value: • Clients and communities • Accountability • Partnerships • Fiscal prudence • Quality Services • Organizational excellence CAREER RESOURCES Job Announcements: https://www.governmentjobs.com/careers/contracosta 24-Hour Job Line: 925-335-1700 Call any time for recent job openings!
Company Details
contra-costa-county
5,101
21,927
92
ca.gov
0
CON_1825550
In-progress
Between 650 and 699

CCC Global Score (TPRM)XXXX

Description: 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.
Description: 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.
Description: 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.
Description: 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.


No incidents recorded for Contra Costa County in 2025.
No incidents recorded for Contra Costa County in 2025.
No incidents recorded for Contra Costa County in 2025.
CCC cyber incidents detection timeline including parent company and subsidiaries

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 each one of our employees value: • Clients and communities • Accountability • Partnerships • Fiscal prudence • Quality Services • Organizational excellence CAREER RESOURCES Job Announcements: https://www.governmentjobs.com/careers/contracosta 24-Hour Job Line: 925-335-1700 Call any time for recent job openings!


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Explore insights on cybersecurity incidents, risk posture, and Rankiteo's assessments.
The official website of Contra Costa County is https://www.contracosta.ca.gov/361/Human-Resources.
According to Rankiteo, Contra Costa County’s AI-generated cybersecurity score is 650, reflecting their Weak security posture.
According to Rankiteo, Contra Costa County currently holds 0 security badges, indicating that no recognized compliance certifications are currently verified for the organization.
According to Rankiteo, Contra Costa County is not certified under SOC 2 Type 1.
According to Rankiteo, Contra Costa County does not hold a SOC 2 Type 2 certification.
According to Rankiteo, Contra Costa County is not listed as GDPR compliant.
According to Rankiteo, Contra Costa County does not currently maintain PCI DSS compliance.
According to Rankiteo, Contra Costa County is not compliant with HIPAA regulations.
According to Rankiteo,Contra Costa County is not certified under ISO 27001, indicating the absence of a formally recognized information security management framework.
Contra Costa County operates primarily in the Government Administration industry.
Contra Costa County employs approximately 5,101 people worldwide.
Contra Costa County presently has no subsidiaries across any sectors.
Contra Costa County’s official LinkedIn profile has approximately 21,927 followers.
Contra Costa County is classified under the NAICS code 92, which corresponds to Public Administration.
No, Contra Costa County does not have a profile on Crunchbase.
Yes, Contra Costa County maintains an official LinkedIn profile, which is actively utilized for branding and talent engagement, which can be accessed here: https://www.linkedin.com/company/contra-costa-county.
As of December 04, 2025, Rankiteo reports that Contra Costa County has experienced 4 cybersecurity incidents.
Contra Costa County has an estimated 11,337 peer or competitor companies worldwide.
Incident Types: The types of cybersecurity incidents that have occurred include Breach.
Total Financial Loss: The total financial loss from these incidents is estimated to be $0.
Detection and Response: The company detects and responds to cybersecurity incidents through an remediation measures with offered complimentary credit monitoring, and communication strategy with notified impacted individuals, and incident response plan activated with likely (investigation conducted), and recovery measures with settlement agreement (compensation + credit monitoring), and communication strategy with data breach notification letters (sent ~may 10, 2023)..
Title: Contra Costa County Email Breach
Description: An unauthorized party accessed certain employee email accounts of Contra Costa County in a computer breach. The emails had attachments containing sensitive information of county employees and individuals who communicated with the Employment and Human Services Department.
Type: Data Breach
Attack Vector: Email Account Compromise
Threat Actor: Unauthorized Party
Title: Data Breach at County of Contra Costa
Description: 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.
Date Detected: 2023-05-11
Date Publicly Disclosed: 2023-05-11
Type: Data Breach
Attack Vector: Phishing
Vulnerability Exploited: Email Phishing
Title: Contra Costa County Data Breach (September 2022)
Description: The County of Contra Costa experienced a phishing incident in September 2022, where unauthorized parties accessed emails and attachments in two county employee accounts. This led to a class action lawsuit alleging failure to adequately protect personal information. A settlement was reached in May 2023, offering affected individuals up to $5,500 in compensation and two years of credit monitoring.
Date Detected: 2022-09-20
Date Publicly Disclosed: 2023-05-10
Type: Data Breach
Attack Vector: Email Phishing
Vulnerability Exploited: Human Error (Phishing Susceptibility)
Threat Actor: Unauthorized Parties (Unknown)
Motivation: Likely Financial Gain (Data Theft/Exploitation)
Common Attack Types: The most common types of attacks the company has faced is Breach.
Identification of Attack Vectors: The company identifies the attack vectors used in incidents through Email Accounts, Email Phishing and Phishing Email (compromised employee accounts).

Data Compromised: Social security numbers, Driver's license or state-issued identification numbers, Financial account numbers, Passport numbers, Medical information, Health insurance information
Systems Affected: Email Accounts

Data Compromised: Names, Social security numbers, Medical information

Data Compromised: Emails, Attachments (likely containing pii)
Systems Affected: 2 Employee Email Accounts
Customer 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)
Average Financial Loss: The average financial loss per incident is $0.00.
Commonly Compromised Data Types: The types of data most commonly compromised in incidents are Social Security Numbers, Driver'S License Or State-Issued Identification Numbers, Financial Account Numbers, Passport Numbers, Medical Information, Health Insurance Information, , Names, Social Security Numbers, Medical Information, , Personally Identifiable Information (Pii), Emails, Attachments and .

Entity Name: Contra Costa County
Entity Type: Government
Industry: Public Administration
Location: Contra Costa County, California

Entity Name: County of Contra Costa
Entity Type: Government
Industry: Public Administration
Location: California, USA

Entity Name: County of Contra Costa
Entity Type: Local Government
Industry: Public Administration
Location: Contra Costa County, California, USA
Customers Affected: 15,591 individuals (with California mailing addresses)

Remediation Measures: Offered complimentary credit monitoring
Communication Strategy: Notified impacted individuals

Incident Response Plan Activated: Likely (investigation conducted)
Recovery Measures: Settlement agreement (compensation + credit monitoring)
Communication Strategy: Data breach notification letters (sent ~May 10, 2023)
Incident Response Plan: The company's incident response plan is described as Likely (investigation conducted).

Type of Data Compromised: Social security numbers, Driver's license or state-issued identification numbers, Financial account numbers, Passport numbers, Medical information, Health insurance information
Sensitivity of Data: High
Personally Identifiable Information: Yes

Type of Data Compromised: Names, Social security numbers, Medical information
Sensitivity of Data: High

Type of Data Compromised: Personally identifiable information (pii), Emails, Attachments
Number of Records Exposed: 15,591 individuals
Sensitivity of Data: High (PII, potential financial/health data in emails)
Data Exfiltration: Likely (unauthorized access to emails/attachments)
File Types Exposed: EmailsAttachments (e.g., PDFs, documents)
Personally Identifiable Information: NamesAddressesPotentially: SSNs, financial data, health data (if included in emails)
Prevention of Data Exfiltration: The company takes the following measures to prevent data exfiltration: Offered complimentary credit monitoring.
Data Recovery from Ransomware: The company recovers data encrypted by ransomware through Settlement agreement (compensation + credit monitoring).

Regulations Violated: Potentially: California Consumer Privacy Act (CCPA), California Data Breach Notification Law,
Legal Actions: Class action lawsuit (settled)
Regulatory Notifications: Data breach notifications sent to affected individuals (May 2023)
Ensuring Regulatory Compliance: The company ensures compliance with regulatory requirements through Class action lawsuit (settled).

Source: Contra Costa County

Source: California Office of the Attorney General
Date Accessed: 2023-05-11

Source: Class Action Settlement Notice

Source: Contra Costa County Official Statements (if any)
Additional Resources: Stakeholders can find additional resources on cybersecurity best practices at and Source: Contra Costa County, and Source: California Office of the Attorney GeneralDate Accessed: 2023-05-11, and Source: California Office of the Attorney General, and Source: Class Action Settlement Notice, and Source: Contra Costa County Official Statements (if any).

Investigation Status: Resolved (settlement reached)
Communication of Investigation Status: The company communicates the status of incident investigations to stakeholders through Notified impacted individuals, Data breach notification letters (sent ~May 10 and 2023).

Stakeholder Advisories: Settlement notices sent to affected individuals (May 2023)
Customer Advisories: Credit monitoring enrollment instructions provided
Advisories Provided: The company provides the following advisories to stakeholders and customers following an incident: were Settlement notices sent to affected individuals (May 2023) and Credit monitoring enrollment instructions provided.

Entry Point: Email Accounts

Entry Point: Email Phishing

Entry Point: Phishing Email (compromised employee accounts)
High Value Targets: Employee Email Accounts,
Data Sold on Dark Web: Employee Email Accounts,

Root Causes: Email Phishing

Root Causes: Phishing Vulnerability, Inadequate Email Security Controls, Lack Of Multi-Factor Authentication (Mfa),
Corrective Actions: Settlement Agreement (Compensation), Likely: Enhanced Email Security Training, Mfa Implementation (Not Explicitly Stated),
Corrective Actions Taken: The company has taken the following corrective actions based on post-incident analysis: Settlement Agreement (Compensation), Likely: Enhanced Email Security Training, Mfa Implementation (Not Explicitly Stated), .
Last Attacking Group: The attacking group in the last incident were an Unauthorized Party and Unauthorized Parties (Unknown).
Most Recent Incident Detected: The most recent incident detected was on 2023-05-11.
Most Recent Incident Publicly Disclosed: The most recent incident publicly disclosed was on 2023-05-10.
Highest Financial Loss: The highest financial loss from an incident was {'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 determined'}.
Most Significant Data Compromised: The most significant data compromised in an incident were Social Security numbers, Driver's license or state-issued identification numbers, Financial account numbers, Passport numbers, Medical information, Health insurance information, , Names, Social Security numbers, Medical information, , Emails, Attachments (likely containing PII) and .
Most Significant System Affected: The most significant system affected in an incident was 2 Employee Email Accounts.
Most Sensitive Data Compromised: The most sensitive data compromised in a breach were Social Security numbers, Financial account numbers, Attachments (likely containing PII), Driver's license or state-issued identification numbers, Health insurance information, Names, Medical information, Passport numbers and Emails.
Number of Records Exposed in Most Significant Breach: The number of records exposed in the most significant breach was 15.6K.
Most Significant Legal Action: The most significant legal action taken for a regulatory violation was Class action lawsuit (settled).
Most Recent Source: The most recent source of information about an incident are Contra Costa County Official Statements (if any), Class Action Settlement Notice, Contra Costa County and California Office of the Attorney General.
Current Status of Most Recent Investigation: The current status of the most recent investigation is Resolved (settlement reached).
Most Recent Stakeholder Advisory: The most recent stakeholder advisory issued was Settlement notices sent to affected individuals (May 2023), .
Most Recent Customer Advisory: The most recent customer advisory issued was an Credit monitoring enrollment instructions provided.
Most Recent Entry Point: The most recent entry point used by an initial access broker were an Email Phishing, Phishing Email (compromised employee accounts) and Email Accounts.
Most Significant Root Cause: The most significant root cause identified in post-incident analysis was Email Phishing, Phishing vulnerabilityInadequate email security controlsLack of multi-factor authentication (MFA).
Most Significant Corrective Action: The most significant corrective action taken based on post-incident analysis was Settlement agreement (compensation)Likely: Enhanced email security training, MFA implementation (not explicitly stated).
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