Your first steps after spotting roaches
Report the problem to your landlord in writing right away, take photos, and keep copies — then ask for professional pest control rather than trying to solve a real infestation with store-bought spray alone.
A written report, like a text or email you save, records when the landlord was notified, which matters if the problem drags on. Photograph the roaches, droppings, and any damage, and note how long it has been going on. Keep your kitchen clean and store food in sealed containers so you are not feeding them, but understand that a building infestation usually needs a licensed exterminator that the landlord arranges and pays for.
Save receipts for any food or belongings you had to throw out, and avoid signing anything that shifts responsibility to you before you understand your rights. If your landlord ignores a written report about roaches, a free review can help you decide what to do next.
This is general information about California tenant rights, not legal advice. Every situation is different.