California advertising laws prohibit untrue or misleading statements about any product or service and back that prohibition with criminal penalties, civil fines, government enforcement, and private consumer lawsuits. The core rule sits in Business and Professions Code Section 17500, but any business advertising to Californians also has to reckon with the Unfair Competition Law, the Consumers Legal Remedies Act, the Automatic Renewal Law, Proposition 65, and a cluster of rules covering online advertising, environmental claims, and country-of-origin labels.
The Core Rule: BPC 17500
Section 17500 makes it unlawful to publish a statement about real or personal property, services, or related circumstances that is untrue or misleading when the advertiser knows, or by the exercise of reasonable care should know, the statement is false.1California Legislative Information. California Business and Professions Code 17500 The statute reaches every channel: print, broadcast, internet, and public announcements.
That “reasonable care” standard is where most businesses get into trouble. You cannot defend a misleading ad by saying you did not know. The question is whether a reasonable person in your position would have checked. The practical effect is that advertisers carry the burden of substantiation. Before running a claim about price, quality, health benefits, or performance, keep reliable evidence on hand that supports it.
Puffery Versus Actionable Claims
Not every exaggeration violates the law. Courts separate puffery, which is vague subjective boasting no reasonable consumer would take literally, from specific factual assertions that can be tested. Calling your restaurant “world famous” is puffery. Claiming a supplement “reduces joint pain by 40%” is a factual assertion a court can test. The dividing line is whether the claim could be proven true or false.
Bait-and-Switch
Section 17500 also specifically targets bait-and-switch schemes: advertising goods or services at a stated price with no genuine intent to sell at that price.1California Legislative Information. California Business and Professions Code 17500 Luring customers with an attractive price and then steering them to something more expensive is prohibited.
How the Unfair Competition Law Expands the Reach
Business and Professions Code Section 17200, the Unfair Competition Law, defines unfair competition to include any unlawful, unfair, or fraudulent business practice, and explicitly includes “unfair, deceptive, untrue or misleading advertising” along with any conduct that violates BPC 17500.2California Legislative Information. California Business and Professions Code 17200 The UCL matters because it unlocks remedies BPC 17500 alone does not provide.
Under BPC 17203, a court can enjoin a business and order it to return money or property acquired through the unlawful practice.3California Legislative Information. California Business and Professions Code 17203 The law can be enforced by the Attorney General, district attorneys, certain city attorneys, and private individuals who lost money or property because of the unfair competition.4California Legislative Information. California Business and Professions Code 17204 That private standing provision is the key. A single misled customer can bring the suit, not just a prosecutor.
Penalties
Criminal
A violation of BPC 17500 is a misdemeanor. Each offense carries up to six months in county jail, a fine of up to $2,500, or both.1California Legislative Information. California Business and Professions Code 17500 The statute applies to any person, firm, corporation, or employee involved in creating or distributing the material. Individual marketing directors, executives, and copywriters can face personal criminal liability, not just the company.
Civil
The UCL’s civil penalty provision under BPC 17206 allows government enforcers to seek up to $2,500 per violation.5California Legislative Information. California Business and Professions Code 17206 When a deceptive ad runs across thousands of impressions or affects hundreds of customers, each instance can count as a separate violation. The math escalates quickly.
Separately, BPC 17535 authorizes courts to enjoin any person or entity that violates the false advertising chapter and to order the return of money or property obtained through those violations.6California Legislative Information. California Business and Professions Code BPC 17535
Consumer Lawsuits Under the CLRA
The Consumers Legal Remedies Act gives individual consumers a direct path to sue. Civil Code Section 1770 lists over two dozen prohibited practices, including misrepresenting the quality, ingredients, or benefits of goods; advertising products with no intent to sell them as advertised; making false claims about price reductions; and representing that a repair or service is needed when it is not.7California Legislative Information. California Civil Code CIV 1770
A consumer harmed by any of these practices can recover actual damages, restitution, punitive damages, injunctive relief, and court costs plus attorney’s fees. In a class action, total damages cannot be less than $1,000. Seniors over 65 and disabled individuals can receive up to $5,000 in additional damages on top of their other recovery if the court finds they suffered substantial harm.8California Legislative Information. California Civil Code 1780 The attorney’s fees provision drives the economics: it lets lawyers take consumer cases even when individual damages are small.
One procedural rule catches both sides off guard. Before filing a CLRA damages claim, the consumer must send the business written notice by certified mail identifying the alleged violations and demanding a fix. The business then has 30 days to correct the problem. If it does, the damages claim is barred.9California Legislative Information. California Civil Code CIV 1782 For businesses, that 30-day window is a real opportunity to resolve a dispute before it becomes litigation. Ignoring the notice letter is one of the costliest mistakes a company can make.
Subscriptions and Automatic Renewals
California’s Automatic Renewal Law, BPC 17600 through 17606, imposes detailed requirements on any business that offers subscriptions, free trials, or recurring-charge plans. It is a frequent source of class-action litigation.
Before charging a consumer’s payment method, the business must present the renewal terms “clearly and conspicuously,” meaning in larger or contrasting type that calls attention to the language. Those terms must disclose that the subscription continues until the consumer cancels, the cancellation policy, the recurring charges and whether they may change, the length of the renewal term, and any minimum purchase obligation.10California Legislative Information. California Business and Professions Code 17600-17606
The business must obtain affirmative consent and send an acknowledgment that includes the renewal terms and clear cancellation instructions. For free trials, the acknowledgment must let the consumer cancel before the first charge. Cancellation itself must be easy, with a toll-free number, email address, or another cost-effective mechanism.11California Legislative Information. California Business and Professions Code 17602
If the consumer signed up online, the business must let them cancel entirely online. Acceptable methods include a prominently placed button in account settings or a pre-formatted termination email the consumer can send immediately.11California Legislative Information. California Business and Professions Code 17602 Routing a customer through a retention phone call when they clicked “cancel” online is exactly the obstruction this law targets. If renewal terms change materially, the business must notify the consumer and provide cancellation instructions before implementing the change.
Environmental, Origin, and Chemical-Warning Claims
Green Marketing
BPC 17580.5 makes it unlawful to make any deceptive environmental marketing claim, whether explicit or implied. The statute defines “environmental marketing claim” by reference to the FTC’s Green Guides, which cover terms like “recyclable,” “biodegradable,” “renewable,” and “carbon offset.” Claims that conform to the Green Guides’ standards and examples have a statutory defense against suits under this section.12California Legislative Information. California Business and Professions Code 17580.5 The FTC’s Guides include specific guidance on product certifications, seals of approval, and carbon offset claims.13Federal Trade Commission. Green Guides
Made in USA
Products advertised or labeled as “Made in USA” must be “all or virtually all” made domestically under the FTC’s Made in USA Labeling Rule. An unqualified Made in USA claim on a product that falls short exposes the marketer to civil penalties.14Federal Trade Commission. Complying with the Made in USA Standard Limited exceptions exist for items already subject to other country-of-origin labeling laws, such as automobiles and textiles. A deceptive origin claim can also trigger state liability under BPC 17500 and the UCL.
Proposition 65
Proposition 65 applies to advertising and product labeling, not just workplace safety. Under Health and Safety Code Section 25249.6, no business may knowingly expose any individual to a chemical known to the state to cause cancer or reproductive toxicity without first providing a clear and reasonable warning.15California Legislative Information. California Health and Safety Code 25249.6 A warning is required unless the exposure falls below safe harbor levels that pose no significant risk.16OEHHA. About Proposition 65
Product listings, catalogs, and online product pages that fail to include required warnings can generate enforcement actions and significant settlement demands. Private enforcers actively file Prop 65 lawsuits, and settlements routinely reach five and six figures. Any business selling consumer products in California should verify whether its products contain listed chemicals and ensure warnings appear wherever the product is advertised or sold.
Online Advertising Rules
Privacy and Targeted Ads
The California Consumer Privacy Act, as amended by the California Privacy Rights Act in 2023, gives residents the right to opt out of the sale or sharing of their personal information. “Sharing” specifically includes providing personal data for cross-context behavioral advertising, which means targeting ads based on activity across multiple sites.17State of California – Department of Justice – Office of the Attorney General. California Consumer Privacy Act (CCPA) If a consumer opts out, businesses must stop and cannot ask them to opt back in for at least 12 months. Any business collecting California residents’ data for ad targeting needs a mechanism to honor these requests.
Influencer Disclosures
When a material connection exists between an endorser and a marketer, including payment, free products, or any other benefit, that connection must be disclosed clearly.18Federal Trade Commission. Advertisement Endorsements A failure to disclose a paid relationship can trigger liability under both BPC 17500 and the UCL. Burying a “#ad” hashtag at the bottom of a lengthy caption does not meet the “clear and conspicuous” standard.
Commercial Email
California’s anti-spam statute, BPC 17529.5, makes it unlawful to send a commercial email from California or to a California email address if the message uses a third party’s domain name without permission, contains falsified or forged header information, or has a subject line likely to mislead a reasonable recipient about the message’s contents.19California Legislative Information. California Business and Professions Code 17529.5 Businesses also remain subject to the federal CAN-SPAM Act, which requires commercial emails to be identified as advertisements, include a physical address, and provide a working opt-out mechanism honored within 10 business days.20Federal Trade Commission. CAN-SPAM Act: A Compliance Guide for Business
Children Under 13
Businesses whose services are directed at children under 13, or that knowingly collect data from children, must comply with the federal Children’s Online Privacy Protection Rule, which requires parental consent before collecting, using, or disclosing a child’s personal information. As of February 2026, the FTC issued a policy statement allowing operators that collect data solely for age verification to proceed without first getting parental consent if they limit use of the data to age verification, delete it promptly, and employ reasonable security safeguards.21Federal Trade Commission. FTC Issues COPPA Policy Statement to Incentivize the Use of Age Verification Technologies to Protect Children Online A COPPA failure can also create UCL exposure at the state level.
Defenses Available to Advertisers
Truth and Substantiation
The most direct defense is proving the statement was true. Because BPC 17500 requires either actual knowledge or a failure of reasonable care, an advertiser who maintained thorough documentation supporting each claim is well positioned to defend a challenge. The defense hinges on having the evidence ready before the claim runs, not assembling it after a complaint arrives. Test results, survey data, and third-party certifications should be organized and accessible.
Green Guides Safe Harbor
BPC 17580.5 provides a specific safe harbor for environmental marketing claims that conform to the FTC Green Guides.12California Legislative Information. California Business and Professions Code 17580.5 This defense is narrow and applies only to environmental claims. California advertising law contains no general safe harbor shielding advertisers who relied on authoritative sources or industry standards for other types of claims.
Puffery
Statements that are clearly subjective opinions or exaggerations no reasonable consumer would take literally are generally not actionable. When in doubt, ask whether a consumer could reasonably rely on the claim when making a purchasing decision. If they could, it is not puffery.
Correction Under the CLRA
For CLRA claims specifically, businesses that receive the required 30-day notice letter have an opportunity to correct, repair, or replace the goods or services at issue. If an appropriate remedy is provided within that 30-day window, the damages claim is barred.9California Legislative Information. California Civil Code CIV 1782 It is not a blanket defense, because the consumer can still seek injunctive relief, but it can eliminate the most expensive part of the litigation. A company should have a process to recognize and escalate CLRA notice letters immediately rather than routing them through normal customer service channels.