California Business and Professions Code Section 17500 is the state’s false advertising law. It makes it a misdemeanor for any person or business selling goods, services, or real property to publish a statement about what they are selling that is untrue or misleading, when the advertiser knew or reasonably should have known the statement was false.1California Legislative Information. California Business and Professions Code BPC 17500 A violation can bring up to six months in county jail, a fine of up to $2,500, civil penalties of up to $2,500 per violation in a government action, and private lawsuits for restitution and court orders forcing the ads to stop.
What the Statute Prohibits
Section 17500 reaches every commercial medium. Internet, print, broadcast, mail, in-store signage, packaging, or any other method of communication all fall within it.1California Legislative Information. California Business and Professions Code BPC 17500 If a business makes a claim to sell something in California, 17500 applies.
The knowledge standard matters. The advertiser does not have to intend to deceive anyone. It is enough that the advertiser knew, or by exercising reasonable care should have known, that the statement was untrue or misleading.1California Legislative Information. California Business and Professions Code BPC 17500 That is closer to negligence than to fraud. “I didn’t realize it was false” rarely works when basic fact-checking would have caught the problem.
Courts judge whether an ad is misleading from the perspective of a reasonable consumer. The question is not what the advertiser meant. It is whether an ordinary person seeing the ad would likely be deceived. Both express claims (a label saying “100% organic” when the product is not) and implied claims (packaging designed to suggest something the product cannot deliver) can trigger liability. The claim also has to be material, meaning the kind of statement that would actually influence a purchasing decision. A trivially false detail that no consumer would rely on generally is not actionable.
The Price Advertising Rule Under 17501
A companion section, BPC 17501, adds a specific rule for “was/now” pricing. A business cannot advertise a former price unless that price was the prevailing market price within the three months immediately before the ad ran, or the ad clearly states when the former price was in effect.2California Legislative Information. California Business and Professions Code BPC 17501 Fake reference prices used to make a “sale” look bigger than it is are one of the most commonly prosecuted retail violations.
Criminal Penalties
A violation of 17500 is a misdemeanor. The maximum sentence is six months in county jail, a fine of up to $2,500, or both.1California Legislative Information. California Business and Professions Code BPC 17500 Criminal prosecution is not the norm for ordinary false advertising. Prosecutors tend to reserve misdemeanor charges for cases involving clear intent to defraud, repeat offenders, or schemes targeting vulnerable consumers. A company that runs a misleading ad and pulls it promptly is far less exposed than one that runs a deliberate bait-and-switch for months.
The criminal penalty attaches to individuals, not only to businesses. The person who created or authorized the false advertisement can face personal liability. Officers, managers, and marketing directors who personally participated in the deceptive conduct are all potentially exposed.
Civil Penalties and Government Enforcement
Separate from criminal prosecution, government enforcers can seek civil penalties of up to $2,500 for each violation. Those actions can be brought by the Attorney General, district attorneys, certain city attorneys, and county counsel.3California Legislative Information. California Business and Professions Code BPC 17206 When an ad campaign reaches thousands or millions of consumers, each instance can be counted as a separate violation, and the total can climb into the hundreds of thousands or millions of dollars.
Government actions can also seek restitution for affected consumers and injunctions stopping the deceptive practice. Under BPC 17535, a court can enjoin any business that violates or proposes to violate the false advertising law, appoint a receiver if necessary, and order restoration of money or property acquired through the unlawful conduct.4California Legislative Information. California Business and Professions Code BPC 17535 In more serious cases, courts can order corrective advertising: the company must publish new statements undoing the misleading impression it created. The Attorney General can also seek disgorgement of profits the business earned from the false advertising.
How Private Consumers Sue Under 17500
Individual consumers rarely bring standalone 17500 claims. Two related statutes do the work in private lawsuits, and both piggyback on 17500 violations.
The Unfair Competition Law, BPC 17200, defines “unfair competition” to include any unlawful, unfair, or fraudulent business practice and any misleading advertising, and it explicitly incorporates violations of 17500.5California Legislative Information. California Business and Professions Code BPC 17200 A consumer who lost money because of a deceptive ad can sue under the UCL for restitution and an injunction, so long as they can show they personally lost money or property as a result.6California Legislative Information. California Business and Professions Code BPC 17204 Traditional money damages and punitive damages are not available under the UCL, and disgorgement of the business’s profits is reserved for cases brought by the Attorney General.
The Consumers Legal Remedies Act (CLRA), at Civil Code Section 1770, is where the harder-hitting private remedies live. It lists more than two dozen prohibited practices, many overlapping with 17500: misrepresenting the characteristics, quality, or ingredients of goods or services; advertising goods with the intent not to sell them as advertised; making false claims about price reductions; and advertising a price that excludes mandatory fees beyond government taxes and shipping.7California Legislative Information. California Civil Code 1770 Unlike the UCL, the CLRA allows actual damages, punitive damages in appropriate cases, restitution, and mandatory attorney’s fees for prevailing plaintiffs. Seniors and disabled consumers can recover an additional award of up to $5,000 when the court finds substantial harm and certain aggravating factors. In a class action, the total damages award must be at least $1,000.8California Legislative Information. California Civil Code 1780
One procedural trap catches CLRA plaintiffs: before filing a CLRA lawsuit for damages, the consumer must send the business a written demand letter giving it 30 days to correct the practice. Skipping that step can sink an otherwise valid claim. The demand letter is not required when the plaintiff seeks only injunctive relief.
BPC 17535, mentioned above, is the third private avenue. It lets anyone who suffered injury in fact and lost money or property because of false advertising sue for injunctive relief and restitution.4California Legislative Information. California Business and Professions Code BPC 17535 Most consumer attorneys file under all three statutes at once, using 17500 as the underlying violation, to maximize the remedies available.
Deadlines to Sue
The statute of limitations depends on the vehicle used to reach 17500:
- UCL claims (BPC 17200): four years from when the cause of action accrued.9California Legislative Information. California Business and Professions Code BPC 17208
- CLRA claims: three years from the date of the prohibited act.10California Legislative Information. California Civil Code 1783
For an ongoing ad campaign, the clock often restarts with each new publication. Even so, waiting near the deadline is risky. Memories fade, evidence disappears, and courts are less sympathetic to plaintiffs who sat on their rights.
Common Defenses
The strongest defense is truth. If the challenged statement is accurate and can be documented, there is no 17500 violation. Several other defenses come up regularly.
Puffery is the most common. Statements like “the best pizza in town” or “world-class service” are subjective opinions rather than factual claims, and courts generally treat them as non-actionable because no reasonable consumer would take them as literal, verifiable promises. The defense has limits. The more specific the claim, the harder it is to characterize as puffery. “America’s best-selling truck” is a factual assertion, not puffery, because it can be verified.
Substantiation is another regular defense. A company that based its claims on credible scientific evidence, expert analysis, or reliable testing that existed at the time the ad ran can argue it acted in good faith and had no reason to know the claim was false. That defense works best when the company can produce the actual studies or expert opinions it relied on. After-the-fact rationalizations are much less persuasive.
Federal preemption can apply in heavily regulated industries. When a federal agency like the FDA has specific rules governing how a product must be labeled or advertised, and the company complied with those rules, that compliance can sometimes preempt state false advertising claims. The defense is narrow and industry-specific. It fits sectors like pharmaceuticals and food labeling where federal rules directly address the type of claim at issue. General compliance with federal law does not automatically shield a company from 17500.
Prompt correction rarely eliminates liability, but it can reduce the consequences. A company that discovers a misleading claim, pulls it immediately, and takes steps to correct the record shows good faith. Courts and prosecutors treat businesses that self-correct more leniently than those that double down after being caught.