Pepper spray laws in San Francisco come from California, not the city, and they let any adult 18 or older carry a canister for self-defense without a permit, registration, or training. Sixteen- and seventeen-year-olds can carry with written parental consent. The canister has to weigh 2.5 ounces or less, must be an aerosol, and must carry the state-mandated warning label. People with a felony conviction, any assault conviction, or a narcotics addiction cannot legally possess it at all. San Francisco layers a few location-specific rules on top of the state framework, mostly around City Hall, federal buildings, and the airport.
Who Can Legally Carry Pepper Spray
California Penal Code Section 22810 is the controlling statute. Any adult 18 or older can buy, possess, and use pepper spray for self-defense without a permit, background check, or class.1California Legislative Information. California Penal Code 22810
At 16 or 17, possession is legal only with written consent from a parent or guardian. That consent isn’t a free pass: under Penal Code Section 22815, the consenting parent becomes jointly liable for damages if the minor misuses the spray.2Justia Law. California Penal Code 22810-22840 Anyone younger than 16 cannot legally possess pepper spray regardless of what a parent says.
Three categories of adults are barred from possession entirely:
- Anyone convicted of a felony under federal, California, or any other jurisdiction’s law.
- Anyone convicted of any assault crime, including misdemeanor assault.
- Anyone addicted to a narcotic drug.
A prior conviction for misusing tear gas under Section 22810(g) also puts you on the prohibited list.1California Legislative Information. California Penal Code 22810
What Kind of Canister Is Legal
The product itself has to meet state specifications. Three matter most:
- Net weight of aerosol spray cannot exceed 2.5 ounces.
- The delivery has to be an aerosol. Projectile devices or non-aerosol chemical dispensers are not legal for civilian carry.
- The canister must display this warning: “WARNING: The use of this substance or device for any purpose other than self-defense is a crime under the law. The contents are dangerous — use with care.”
Every canister must also show an expiration date, and at purchase it must come with printed use instructions plus a separate insert covering directions, first aid, safety and storage, and the legal consequences of misuse.1California Legislative Information. California Penal Code 22810 Read the insert. It’s the manufacturer’s own summary of the same rules.
Where You Can’t Take It in San Francisco
Carrying a legal canister on the street is fine. Several buildings and zones inside city limits are not.
City Hall
San Francisco’s City Hall security expressly bans “disabling chemicals such as pepper spray or Mace” from the building.3SF.gov. Prohibited Items and Activities Anything from a Board of Supervisors meeting to a marriage license appointment means leaving the canister at home or in your car. Security will confiscate it, and you may not get it back.
Federal Buildings
Federal law prohibits dangerous weapons in federal facilities, with penalties of up to one year in jail for standard federal buildings and up to two years for federal courthouses.4Office of the Law Revision Counsel. 18 USC 930 – Possession of Firearms and Dangerous Weapons in Federal Facilities The federal Interagency Security Committee standard lists “Mace, pepper spray, tear gas” among items prohibited for all occupants, contractors, and visitors.5United States District Court, Northern District of Iowa. Items Prohibited from Federal Facilities – An Interagency Security Committee Standard In San Francisco that reaches the federal courthouse on Golden Gate Avenue, the Phillip Burton Federal Building, post offices, and any other federally operated facility.
San Francisco International Airport
TSA does not allow pepper spray in carry-on bags. You can pack one container in checked luggage if it holds 4 fluid ounces or less and has a safety mechanism to prevent accidental discharge. Sprays containing more than 2 percent tear gas (CS or CN) by mass are banned from checked bags entirely.6Transportation Security Administration. Pepper Spray Most civilian OC (oleoresin capsicum) sprays don’t contain CS or CN, so the checked-bag route works for the majority of products. The officer at the checkpoint has the final say.
BART and Other Transit
BART’s customer code of conduct prohibits carrying weapons “in violation of the law.” A legal canister within the 2.5-ounce limit doesn’t violate California law, so carrying it on BART isn’t itself prohibited. Discharging it inside a crowded train car or station is a different situation and would expose you to both criminal liability and civil claims from any bystanders affected.
Schools
A common belief is that Penal Code Section 626.10 bans pepper spray on K-12 campuses. It doesn’t. The statute lists knives, tasers, stun guns, and similar weapons, but not tear gas or pepper spray.7California Legislative Information. California Penal Code 626.10 Individual districts often ban it through their own policies, and a policy violation can still lead to suspension, expulsion, or a trespassing order even without a state charge. Ask the specific school before bringing a canister on campus.
When You Can Legally Use It
The statute allows use “solely for self-defense purposes.”1California Legislative Information. California Penal Code 22810 California’s general self-defense rule requires a reasonable belief that you face imminent physical harm and that your response is proportional to the threat. Pepper spray sits below firearms and knives on the force scale, so the threshold isn’t fear of death or serious bodily injury. The threat still has to be real and immediate.
Situations that don’t qualify: spraying someone during a verbal argument, using it to teach someone a lesson, deploying it against a person walking away, or using it preemptively on someone you think might become dangerous later. Each of those fails imminence or proportionality, and any of them can convert a self-defense tool into evidence of a crime.
Penalties for Misuse
Using pepper spray for anything other than self-defense is a wobbler under Section 22810(g). Prosecutors can charge it as a misdemeanor or a felony depending on the harm and circumstances.
- Misdemeanor: up to one year in county jail, a fine up to $1,000, or both.
- Felony: 16 months, two years, or three years in county jail, a fine up to $1,000, or both.
Even the felony sentence is served in county jail rather than state prison under realignment (Penal Code Section 1170(h)).1California Legislative Information. California Penal Code 228108California Legislative Information. California Penal Code 1170
Using it against a peace officer performing official duties, where you know or should reasonably know their status, is a straight felony with the same 16-month, two-year, or three-year sentencing range and a fine up to $1,000. The county jail alternative disappears.1California Legislative Information. California Penal Code 22810 This is where people get into the deepest trouble during protests or confrontations with police.
Criminal charges aren’t the only exposure. Someone you spray without legal justification can sue you for assault and battery, with damages covering medical costs, lost wages, and pain and suffering. Even a genuine belief in danger doesn’t protect you if a court later finds the threat wasn’t imminent or your response was disproportionate. And if you signed parental consent for a 16- or 17-year-old, misuse by the minor makes you jointly liable for those damages.2Justia Law. California Penal Code 22810-22840
Buying, Replacing, and Disposing
Drugstores, sporting goods stores, and gun shops in San Francisco carry pepper spray. No waiting period, no registration, no permit. Online orders ship to California without issue from most retailers.
Shipping a canister yourself is more restricted because aerosol defense sprays are hazardous materials. The USPS requires compliance with Publication 52, and knowingly mailing dangerous materials in violation of postal rules carries civil penalties from $250 to $100,000 plus cleanup costs.9United States Postal Service. Shipping Restrictions and HAZMAT – What Can You Send in the Mail Most retailers use ground shipping via UPS or FedEx with hazmat labeling instead.
Watch the expiration date printed on the canister.1California Legislative Information. California Penal Code 22810 Propellant pressure drops and the active ingredient degrades over time. A fresh canister might project 10 to 12 feet; an expired one may reach only 3 or 4 feet with much weaker potency. Carrying an expired canister for real protection is carrying false confidence.
When you replace one, don’t drop the old canister in household trash. Pressurized aerosol containers with chemical contents count as hazardous waste. San Francisco runs a household hazardous waste drop-off program that accepts expired defense sprays at no charge; contact SF Environment or your local waste facility for locations and hours.
After Pepper Spray Exposure
Whether you used it in self-defense or caught some of it yourself, the effects are intense: burning eyes, temporary blindness, breathing difficulty, and skin irritation. For most people, symptoms resolve within 30 to 45 minutes of decontamination without medical treatment.10National Center for Biotechnology Information. Tear Gas and Pepper Spray Toxicity
Move to fresh air. Don’t touch or rub your eyes, which pushes the chemical in deeper. Flush affected skin and eyes with cool, clean water for 15 to 20 minutes. Remove contaminated clothing. Skip creams, lotions, and oils on affected skin, since they can trap the capsaicin and prolong the burn. Get emergency care if breathing trouble persists, if you have asthma or another respiratory condition, or if symptoms haven’t improved much after 45 minutes.
If you used pepper spray in self-defense, call 911 as soon as it’s safe. Reporting the incident yourself establishes that you were acting defensively rather than as the aggressor, and it puts an official record in place before the other party can describe the encounter their own way.