Served Something Harmful at a Restaurant? Your Rights Under California Law
When a restaurant serves a customer a harmful substance—a cleaning chemical mistaken for a drink, contaminated or spoiled food, or an undisclosed allergen—the restaurant can be held liable for the resulting injuries. California law holds food businesses to a duty of reasonable care, and a business is generally responsible for the negligence of its employees under respondeat superior.

How can a restaurant be liable?
A restaurant can be liable for negligence (unsafe practices, such as storing cleaning chemicals in drink containers), serving a defective or contaminated product, or failing to warn of a known hazard. Because employers are responsible for employees acting within the scope of their job (respondeat superior), the business—not just the individual worker—answers for the harm.
What injuries do these cases involve?
Ingesting a caustic cleaning agent can cause chemical burns to the mouth, throat, and esophagus and lasting internal damage. Contaminated food can cause serious food-borne illness. For pregnant customers and children, the stakes are especially high. These injuries often require emergency care and long-term follow-up.
What to do after being served a harmful substance
Get emergency medical care immediately, preserve the substance and container if you safely can, report it to management and to the local health department, photograph everything, and get names of witnesses. The physical evidence and the health-department record are important to proving the claim.
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Quick Reference
| Theory | How it applies |
|---|---|
| Negligence | Unsafe practices (chemicals in drink containers) |
| Product liability | Contaminated or defective food/drink |
| Respondeat superior | Employer liable for employee’s conduct |
Frequently Asked Questions
Can I sue a restaurant for serving me a harmful substance?
Yes. If a restaurant negligently served a caustic chemical, contaminated food, or an undisclosed allergen and you were injured, it can be held liable—and the business is responsible for its employees’ conduct under respondeat superior.
What should I preserve after being served something harmful?
If you safely can, keep the substance and its container, get emergency medical care, report it to management and the local health department, photograph everything, and collect witness information.
How long do I have to file a claim?
Generally two years from the injury for a personal-injury claim in California (Code of Civil Procedure §335.1). Prompt medical care and evidence preservation are critical.
Written & legally reviewed by Compass Law Group partners

Joseph Shirazi
Managing Partner, Compass Law Group, LLP
California State Bar #265403 · Loyola Law School, J.D.
Joseph Shirazi is the Managing Partner of Compass Law Group, LLP, leading the firm’s personal-injury, catastrophic-injury, and wrongful-death trial practice. He authored the analysis on this page.
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Simon Esfandi
Partner & Co-Founder, Compass Law Group, LLP
California State Bar #275307 · Loyola Law School, J.D.
Simon Esfandi is a Partner and Co-Founder of Compass Law Group, LLP. He reviewed this page for legal accuracy. Compass represents California injury victims on a No Win, No Fee basis.
Profiles: Avvo · Super Lawyers · Justia · LinkedIn · CA State Bar · Full Bio →
Past results do not guarantee future outcomes. This article is legal information, not legal advice.
Injured and not sure what your claim is worth?
Get a Free ConsultationNo Win, No Fee · (213) 320-1001



