How to Serve a Subpoena in California: Rules and Common Mistakes

A subpoena is a court order compelling someone to testify, produce documents, or both. Unlike a summons and complaint, which starts a lawsuit, a subpoena can be issued mid-case to compel a witness or third party to participate. Serving one correctly matters just as much — get it wrong, and the recipient may have no legal obligation to comply.

Who Can Serve a Subpoena in California?

Under California Code of Civil Procedure § 1987, a subpoena can generally be served by any person over 18 who is not a party to the action. In practice, most attorneys and self-represented litigants hire a registered process server to handle service, since a professional server can properly document the details of service (date, time, location, and manner) in a declaration or proof of service that holds up if challenged.

Rules for Proper Service

A few requirements come up repeatedly in California subpoena service:

• Personal service is generally required. Most subpoenas must be personally handed to the witness — substitute service is not automatically allowed the way it sometimes is for a summons and complaint.
• Witness fees may need to be tendered. For many subpoenas, statutory witness fees and mileage must be offered at the time of service.
• Timing matters. Subpoenas must be served with enough lead time before the compelled appearance or production date — the exact deadline depends on the type of subpoena.
• Business records subpoenas have their own procedure, including specific notice requirements to other parties in the case before records can be produced.

Common Mistakes That Get Service Challenged

The most frequent problems we see with subpoena service include: serving the wrong individual (especially at a business address with multiple employees who share a similar name or title), failing to tender required witness fees, serving too close to the compliance date, and incomplete or inaccurate proof of service paperwork. Any of these can give the other side grounds to move to quash the subpoena, which costs time and can jeopardize a filing deadline.

What to Do After Service Is Completed

Once a subpoena has been served, the process server should provide a signed proof of service documenting exactly who was served, when, where, and how. Keep this with your case file — if service is ever challenged, this document is your evidence that the subpoena was properly delivered.

This article is for general informational purposes only and is not legal advice. Subpoena rules vary by case type and court, so consult a licensed California attorney about the specific requirements for your matter.

Need a subpoena served in the Los Angeles or Glendale area, or on a registered agent like LegalZoom or CSC Lawyers Incorporating Service? Request service or call 213-909-2191.