The many forms retaliation can take
Retaliation can take many forms, but they share a common thread: a landlord taking a negative action against a tenant because the tenant exercised a legal right.
Recognized retaliatory actions often include raising the rent, decreasing services or removing amenities the tenant is entitled to, threatening or bringing an eviction, and serving a notice to terminate the tenancy. Other conduct — like suddenly enforcing rules only against the tenant who complained, refusing to renew without a legitimate reason where renewal would otherwise be expected, or interfering with the tenant's use of the home — can also reflect retaliation depending on the circumstances.
What ties these together is motive and timing. The same action, like a rent increase, can be perfectly lawful in one situation and retaliatory in another, based on why and when the landlord did it.
Because the line depends on the facts, documenting both your protected activity and the landlord's response is key. If your landlord took a negative action and you suspect it was because you asserted your rights, a free, confidential review can help you understand whether it qualifies as unlawful retaliation.
This is general information about California tenant rights, not legal advice. Every situation is different.