Arbitration clauses are generally enforceable in California. Both the California Arbitration Act and the Federal Arbitration Act treat a written agreement to arbitrate as a valid contract, and courts will usually order the parties into arbitration when one exists. But California also gives you some of the strongest grounds in the country to challenge an arbitration clause, and several categories of claims cannot be forced into arbitration at all. Whether your specific clause holds up depends on how it was presented, what it requires of you, and whether your dispute falls into one of the carve-outs.
When a Court Will Enforce the Clause
California Code of Civil Procedure Section 1281 says a written agreement to arbitrate an existing or future dispute is “valid, enforceable and irrevocable,” except on grounds that would justify revoking any contract.1California Legislative Information. California Code of Civil Procedure 1281 The Federal Arbitration Act uses nearly identical language at 9 U.S.C. § 2 for contracts involving interstate commerce.2Office of the Law Revision Counsel. 9 U.S. Code 2 – Validity, Irrevocability, and Enforcement of Agreements to Arbitrate Either way, an arbitration clause is treated like any other contract term: it gets no special boost, and it gets no special burden.
When one party files a petition to compel arbitration under Section 1281.2, the court must order arbitration if a written agreement exists, unless the petitioner waived the right by litigating too long, grounds exist to rescind the agreement, or third parties and overlapping litigation could produce conflicting rulings.3California Legislative Information. California Code of Civil Procedure 1281.2 The judge is not allowed to refuse arbitration just because the underlying case looks weak. The gateway question is narrow: does a valid agreement cover this dispute?
If you want to defeat enforcement, the burden is on you. You have to raise your defenses in response to the petition, and you have to raise them promptly. The most useful defenses are below.
Unconscionability
The defense that succeeds most often is unconscionability. California courts evaluate it in two parts: procedural (how the agreement was formed) and substantive (whether the terms themselves are unfairly one-sided). Both must be present, but they slide against each other. A lot of one can make up for less of the other.4California Law Review. Sliding Scales of Justice? An Analysis of California’s Approach to Unconscionability
Procedural Unconscionability
This asks whether you had any real choice. A take-it-or-leave-it contract where the other side holds all the bargaining power creates at least some procedural unconscionability. The more hidden the arbitration language, the worse the score. A clause buried in tiny font inside a dense document, with no separate acknowledgment, rates higher than one presented clearly above a signature line. Most consumer and employment contracts carry at least some procedural unconscionability because they are adhesion contracts.
Substantive Unconscionability
This asks whether the terms themselves are unreasonably harsh. Courts look for high arbitration fees imposed on consumers or employees, severe limits on gathering evidence, caps on remedies you could otherwise recover, and requirements to arbitrate in a distant location. A lack of mutuality is another warning sign: if the agreement forces you to arbitrate your claims but lets the company sue you in court for the claims it would typically bring, that one-sidedness can sink the clause.
Because procedural unconscionability is almost always present in some degree, the real fight tends to happen on the substantive side. One moderately one-sided term may survive. Stack several together and the whole agreement can fall. Courts sometimes sever an offending provision and enforce the rest, but if multiple provisions are tainted, severance becomes less likely.
Extra Protections for Employees
California holds employment arbitration agreements to a higher standard than ordinary commercial contracts. In Armendariz v. Foundation Health Psychcare Services, the California Supreme Court set five minimum requirements for any employment arbitration agreement covering statutory claims:
- The employee cannot be required to pay fees or costs beyond what filing a lawsuit in court would cost.
- The agreement must allow enough discovery for the employee to meaningfully pursue the claim.
- The arbitrator must be able to award the same relief a court could, including back pay, damages, and attorney’s fees.
- The arbitrator must issue a written decision sufficient for judicial review.
- The arbitrator must be genuinely neutral.
An employment clause that fails any of these risks being struck down. Clauses that cap damages or require the employee to split arbitrator fees are especially vulnerable.
One important boundary: California passed AB 51 in 2019 (Labor Code Section 432.6) to prohibit employers from requiring arbitration as a condition of employment.5California Legislative Information. California Labor Code 432.6 A federal court entered a permanent injunction blocking enforcement, finding the statute preempted by the FAA. The law is still on the books but cannot currently be enforced, so California employers can still condition employment on signing an arbitration agreement.
Claims That Cannot Be Forced Into Arbitration
Some categories of claims and workers are exempt from forced arbitration regardless of what you signed.
Sexual Assault and Sexual Harassment
The Ending Forced Arbitration of Sexual Assault and Sexual Harassment Act, codified at 9 U.S.C. § 402, lets anyone bringing a sexual assault or sexual harassment claim void a pre-dispute arbitration agreement as to that claim. The choice belongs to the person bringing the claim. The statute also puts the question of whether the EFAA applies in the hands of a court, not an arbitrator, even if the contract contains a delegation clause.6Office of the Law Revision Counsel. 9 U.S. Code 402 – No Validity or Enforceability
Transportation Workers
Section 1 of the FAA exempts “seamen, railroad employees,” and similar workers actively engaged in interstate transportation. The Supreme Court clarified in Bissonnette v. LePage Bakeries (2024) that the exemption turns on what the worker actually does, not the industry the employer operates in. A worker whose duties play a direct and necessary role in moving goods across state lines can qualify even if the employer isn’t a trucking or shipping company.
Representative PAGA Claims
California’s Private Attorneys General Act lets employees sue for labor code violations on behalf of themselves and other affected workers. In Viking River Cruises v. Moriana (2022), the U.S. Supreme Court held that an employee’s individual PAGA claims can be forced into arbitration under the FAA.7Oyez. Viking River Cruises, Inc. v. Moriana But in Adolph v. Uber Technologies (2023), the California Supreme Court held that the same employee still has standing to pursue the representative PAGA claims in court on behalf of other workers.8Justia Law. Adolph v. Uber Technologies, Inc. An arbitration clause can split a PAGA case in two, but it cannot kill the representative side.
One category that generally cannot be kept out of arbitration anymore: class action waivers in consumer contracts. The U.S. Supreme Court’s decision in AT&T Mobility v. Concepcion (2011) struck down California’s rule against those waivers, and companies in California can now enforce them.9Justia Law. AT&T Mobility LLC v. Concepcion, 563 U.S. 333 If you agreed to arbitrate individually, you likely cannot join a class.
Watch for a Delegation Clause
Many arbitration agreements include a delegation clause saying that the arbitrator, not a judge, decides whether the arbitration agreement itself is enforceable. The U.S. Supreme Court upheld this in Rent-A-Center v. Jackson (2010), ruling that a delegation clause must be enforced unless the party challenging it attacks the delegation provision specifically, rather than the arbitration agreement as a whole.10Justia Law. Rent-A-Center, West, Inc. v. Jackson, 561 U.S. 63
This is the trap. If you argue unconscionability against the arbitration agreement in general, the court sends your unconscionability argument to the arbitrator. To keep the question in front of a judge, your challenge has to target the delegation provision specifically and explain why that particular clause is unenforceable. If your contract contains one, flag it to an attorney immediately. Missing this distinction can cost you the defense before it is heard.
If the Company Doesn’t Pay Arbitration Fees on Time
California Code of Civil Procedure Sections 1281.97 and 1281.98 create a strict rule for consumer and employment arbitrations. The company that drafted the arbitration agreement must pay required fees within 30 days of the due date on the arbitration provider’s invoice. Miss that deadline, and the employee or consumer can withdraw from arbitration and go to court. If you choose to continue arbitrating, the company covers your attorney’s fees and costs through the end of the case. If you move to court, you can recover expenses related to the breach, and the court can impose sanctions.
The California Supreme Court narrowed this rule in Hohenshelt v. Superior Court (2025), holding that the penalties apply only when the company’s failure to pay was willful, grossly negligent, or fraudulent.11American Arbitration Association. From Rigid to Reasonable: Supreme Court Clarifies Arbitration Fee Payment Rules in California A good-faith administrative slip won’t automatically free you. But if a company is stalling by refusing to pay, this statute is a real escape hatch.
Other Grounds That Can Defeat the Clause
A few other contract defenses can work in the right case. Lack of mutual assent kills a clause that was never actually agreed to. Browse-wrap agreements on websites, where a user allegedly agrees to terms simply by using the site, often fail this test. So do arbitration clauses buried in employee handbooks without a separate acknowledgment.
A clause that waives a right the legislature has made non-waivable can be struck down on public policy grounds. The permissible move is to waive the forum, meaning you arbitrate instead of litigate. The impermissible move is to waive the right itself, like eliminating the statutory attorney’s fees you could recover in a discrimination case.
Opting Out While You Still Can
Some consumer and employment contracts include an opt-out window, often 30 days from signing or first use, that lets you reject the arbitration clause while keeping the rest of the agreement. If yours has one, treat the deadline as hard. Missing it by a day likely locks you in.
Follow the method the contract specifies. If it requires a mailed notice, use certified mail with return receipt. Include your full name, any account or order numbers, and a clear statement that you are opting out of the arbitration provision. Send it to the exact address the contract identifies, and keep copies of everything. Not every contract offers this option, but when it exists, it is the simplest way to preserve your right to go to court if a dispute develops later. Most people skip the step because nothing feels wrong at the time of signing. That is exactly when it matters.