Contra Costa County, located in California, requires a Proof of Service by Mail for Workers' Compensation when serving legal documents related to workers' compensation cases. This document serves as proof that the necessary parties have been properly informed and given a chance to respond to any legal actions. Keywords: Contra Costa County, California, Proof of Service by Mail, Workers' Compensation, legal documents, workers' compensation cases, parties, legal actions. There are two main types of Contra Costa California Proof of Service by Mail for Workers' Compensation: 1. Proof of Service by Mail for Workers' Compensation: This type of proof of service is used when serving any legal documents related to workers' compensation cases in Contra Costa County. It ensures that all parties involved are notified of legal actions and is an essential component of the legal process. The proof of service by mail includes details such as the date and time of service, the name of the person serving the documents, the mailing address used, and the signature of the recipient or an authorized person. 2. Proof of Service Declaration — Mail: Another type of proof of service used in Contra Costa County is the Proof of Service Declaration — Mail. This document is completed by the person serving the legal documents via mail and declares that the documents have been properly mailed to the involved parties as required by law. The proof of service declaration includes details similar to the proof of service by mail, such as the date and time of service, the person serving the documents, and the mailing address used. By requiring a Proof of Service by Mail for Workers' Compensation in Contra Costa County, the legal system ensures that all parties involved have been informed and given the opportunity to respond to any workers' compensation claims or actions. This process promotes fairness and transparency in the legal proceedings, protecting the rights of all parties involved and facilitating effective communication in workers' compensation cases.