When sewage surfaces outside the home
Yes, usually. Sewage surfacing in the yard, driveway, or common areas points to a broken or blocked sewer line or septic system, which is part of the property the landlord is responsible for maintaining and repairing.
When sewage pools outside or bubbles up from the ground, the sewer line or septic system has likely failed or clogged. That is both a health hazard and a sign of a serious plumbing problem. It is not something a tenant can or should fix.
Keep contaminated outdoor areas off-limits, especially to children and pets, and avoid tracking it inside. Report it to your landlord in writing, note the location, and take photos from a safe distance. If your landlord ignores sewage surfacing outside your home, a free review can help you understand your options.
This is general information about California tenant rights, not legal advice. Every situation is different.