Several fixtures draining slowly at once, wastewater appearing at a low fixture, or a blockage that returns after clearing can be reasons to ask whether the main line is involved. These clues are not a diagnosis; plumbing layout and other conditions can produce similar symptoms.
If wastewater is actively entering the property, avoid using affected fixtures and take reasonable steps to keep people away from contaminated water. Contact an appropriate local professional for advice. If you are unsure whether the issue involves private plumbing or a public system, consult the relevant local service channels rather than assuming responsibility.
The most useful first details are the affected fixtures, whether the issue is active or intermittent, when it began, and whether it has happened before.
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