What's the Difference Between a Subpoena and a Summons in California?

What Is a Summons?

A summons is the document that officially notifies you that a civil lawsuit has been filed against you and that you must respond. In California, Judicial Council Form SUM-100 is the standard civil summons. When a plaintiff files a civil complaint, the clerk of court issues a summons, which is then served on each defendant along with the complaint. The summons tells the defendant how many days they have to respond — usually 30 days — and warns them that a default judgment may be entered if they don't file a response.

Summonses are served throughout NorCal courts every day — in Contra Costa County Superior Court in Martinez, the Richmond branch courthouse at 1025 Escobar Street, Alameda County courts in Oakland, and elsewhere. Process servers in Richmond and the Bay Area handle summons service constantly, whether for civil complaints, eviction-related unlawful detainer cases, family law matters, or small claims. Personal service of a summons under CCP § 415.10 is effective immediately upon delivery.

What Is a Subpoena?

A subpoena is a legal order compelling a person or organization to do something in connection with a case that's already in progress. The most common types are: a subpoena for personal appearance (compelling someone to testify at a hearing or trial), a deposition subpoena (compelling appearance and/or document production at a deposition), and a subpoena duces tecum or business records subpoena (compelling production of specific documents or records). Subpoenas are typically issued during the discovery phase of litigation, not at the beginning of a case.

Subpoena service is a significant part of process serving in the Bay Area, particularly for law firms handling civil litigation, employment disputes, and business cases in Contra Costa County and Alameda County. Northbound Legal serves personal appearance subpoenas, deposition subpoenas, and business records subpoenas throughout Richmond, Walnut Creek, Concord, Oakland, and the broader NorCal region. Subpoenas have strict service requirements, including witness fee tendering for personal appearance subpoenas, and errors in service can invalidate the subpoena entirely.

Who Issues Each Document?

A summons is issued by the court upon the filing of a complaint — the clerk of court signs and seals the summons. You cannot simply print a summons form and use it; it must be court-issued. A subpoena, by contrast, can be issued by an attorney of record in the case without court approval under California law (CCP § 1985). Attorneys have the power to issue and sign subpoenas directly — which is why you may receive a subpoena bearing an attorney's signature rather than a judge's or clerk's signature.

This distinction matters for process servers in NorCal because it affects who they receive the documents from and what verification steps are involved. A summons always originates from the court file; a subpoena may come directly from an attorney's office. Law firms throughout Contra Costa County, Alameda County, and the Bay Area frequently issue subpoenas for depositions and records production, and they rely on professional process servers like Northbound Legal to complete service correctly and on schedule.

How Each Document Is Served

A summons must be served by personal delivery or substitute service under CCP §§ 415.10–415.20 — the rules are strict because service of a summons is the formal legal trigger that starts the clock on a defendant's obligation to respond. A defectively served summons can be challenged and quashed, potentially delaying the case significantly. For this reason, plaintiff's attorneys throughout the Bay Area and NorCal insist on professional process servers for summons service.

A subpoena for personal appearance generally requires personal service under CCP § 1987, with witness fees and mileage tendered at the time of service. Business records subpoenas under CCP §§ 2020.410–2020.440 have their own service rules and don't always require the same witness fee tender. Getting the service method right for each subpoena type is critical — and it's something professional process servers in Richmond, Contra Costa County, and throughout NorCal handle as a matter of routine.

What Happens If You Ignore Each

Ignoring a summons means the plaintiff can apply for a default judgment against you — they can potentially win the entire case without you ever presenting your side. Default judgments can be enforced through wage garnishment, bank levies, and property liens, and they're difficult and expensive to set aside once entered. If you were properly served with a summons and ignored it, you have a serious problem.

Ignoring a subpoena can result in contempt of court, which carries fines and in some cases incarceration. Courts throughout California, including Contra Costa County Superior Court, treat subpoena non-compliance seriously. Neither a summons nor a subpoena should ever be ignored. If you receive either document and you're unsure what to do, consult with an attorney immediately. The consequences of inaction are far worse than engaging with the legal process.

Which Document Do You Need? A Decision Framework

The most common source of confusion is knowing which document applies to your situation. Use this framework:

**Starting a new lawsuit against someone?** You need a summons — issued by the court clerk when you file your complaint. The summons and complaint are served together on the defendant under CCP § 415.10.

**Need someone to appear at a deposition or hearing in a case already filed?** You need a subpoena for personal appearance under CCP § 1987. Witness fees and mileage must be tendered at service.

**Need records from a hospital, bank, or employer (not their testimony)?** You need a business records subpoena under CCP § 2020.410. These have specific service rules and do not always require a witness fee tender for the records custodian.

**Need a deposition plus records from the same entity?** You need a deposition subpoena for personal appearance and production of documents — a hybrid form covering both.

**Not a party to the case but being compelled to act?** You're receiving a subpoena. Third parties — banks, hospitals, employers, landlords — receive subpoenas, not summonses. A summons only goes to parties named in the complaint.

Getting the document type right before calling a process server saves significant time and money. If you're unsure which applies to your situation, an attorney consultation before service is worthwhile — an incorrectly issued or served document may need to be re-served from scratch.

Key Differences at a Glance

A summons initiates a lawsuit and makes you a party to the case. A subpoena arises during an existing case and may compel you even if you're not a party — banks, employers, hospitals, and other businesses receive subpoenas regularly. A summons is always issued by the court; a subpoena can be issued by an attorney. Both require proper service to be legally enforceable, and both carry serious consequences if ignored.

For process servers in Richmond and throughout Contra Costa County and the Bay Area, these distinctions affect how each document is handled at every step — from who tenders the documents to how service is documented. Northbound Legal serves both summonses and subpoenas throughout NorCal with full compliance documentation and court-ready proof of service.