How do I know if my drain is clogged or if it's a sewer line issue?

A single slow drain is usually a localized clog — just that fixture. When multiple drains back up at the same time, or you hear gurgling in one fixture when another is draining, that points to the main sewer line.

Sewage smell in the house or water backing up into a tub when you flush the toilet are serious warning signs that the main line is blocked or failing.

Vinson and Sill handles both — drain snaking for individual clogs and full sewer line diagnosis and repair.