If your fourth of July celebration in san bruno includes fireworks, use only safe and sane ones, due to the danger of fireworks that explode or fly, there is a zero-tolerance policy for the sale, possession or use of illegal fireworks like firecrackers or bottle rockets. If caught, you will be cited and fined, $1,000, safe and sane. Fireworks may only be used with adult supervision and on your own property. Keeping streets clear for emergency access have a safe fourth of July.